142 results on '"Pueyo, José Javier"'
Search Results
2. Bio-fertilisation with native plant growth promoting rhizobacteria increases the tolerance of the neotropical legume tree Caesalpinia spinosa to water deficit
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Fundación BBVA, Agencia Estatal de Investigación (España), Comunidad de Madrid, Biotechnology and Biological Sciences Research Council (UK), Cordero, Irene [0000-0002-6249-8348], Pueyo, José Javier [0000-0003-0337-4078], Rincón, Ana [0000-0001-6754-4609], Cordero, Irene, Pueyo, José Javier, Rincón, Ana, Fundación BBVA, Agencia Estatal de Investigación (España), Comunidad de Madrid, Biotechnology and Biological Sciences Research Council (UK), Cordero, Irene [0000-0002-6249-8348], Pueyo, José Javier [0000-0003-0337-4078], Rincón, Ana [0000-0001-6754-4609], Cordero, Irene, Pueyo, José Javier, and Rincón, Ana
- Abstract
Bio-fertilisation with plant growth promoting rhizobacteria (PGPR) can be extremely beneficial for plant development and growth under harsh environments. PGPR have been recently successfully applied in restoration programmes, but locally adapted strains are needed for successful outcomes. In this study, we evaluated the effect of bio-fertilisation with selected native PGPR strains on the growth and physiological response to drought of Caesalpinia spinosa (Mol.) Kuntze (tara), the main tree species of the Atiquipa forest, a highly valuable and unique ecosystem in the middle of the Atacama Desert in Peru. We compared the growth and physiological status of tara seedlings that were bio-fertilised with three PGPR strains, chemically fertilised and a non-fertilised control, under well-watered and under drought conditions. Seedlings inoculated with Pseudomonas sp. strain RC5.5 showed enhanced tolerance to drought, although under favourable, stress-free conditions it did not promote growth and only significantly increased quantum yield of photosystem II (Fv/Fm). On the other hand, chemical fertilisation highly enhanced plant growth, but led to substantial hydric demand under water limitation. Under drought, RC5.5 bio-fertilised plants showed lower reduction of leaf relative water content, net carbon assimilation rate, stomatal conductance, and a balanced shoot-to-root ratio compared with control plants. Therefore, strain RC5.5 is highlighted as a valuable candidate to be used as inoculant of tara in reforestation and restoration programmes in arid zones, in particular the Atiquipa forest, or in local tara plantations.
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- 2024
3. Root acid phosphatases and rhizobacteria synergistically enhance white lupin and rice phosphorus acquisition
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National Natural Science Foundation of China, Ministerio de Ciencia, Innovación y Universidades (España), Ministerio de Ciencia e Innovación (España), Agencia Estatal de Investigación (España), Pueyo, José Javier [0000-0003-0337-4078], Aslam, Mehtab Muhammad, Pueyo, José Javier, Pang, Jiayin, Yang, Jinyong, Chen, Weiguo, Chen, Hao, Waseem, Muhammad, Li, Ying, Zhang, Jianhua, Xu, Weifeng, National Natural Science Foundation of China, Ministerio de Ciencia, Innovación y Universidades (España), Ministerio de Ciencia e Innovación (España), Agencia Estatal de Investigación (España), Pueyo, José Javier [0000-0003-0337-4078], Aslam, Mehtab Muhammad, Pueyo, José Javier, Pang, Jiayin, Yang, Jinyong, Chen, Weiguo, Chen, Hao, Waseem, Muhammad, Li, Ying, Zhang, Jianhua, and Xu, Weifeng
- Abstract
The rhizosheath is a belowground area that acts as a communication hub at the root–soil interface to promote water and nutrient acquisition. Certain crops, such as white lupin (Lupinus albus), acquire large amounts of phosphorus (P), owing partially to exudation of acid phosphatases (APases). Plant growth-promoting rhizobacteria also increase soil P availability. However, potential synergistic effects of root APases and rhizosheath-associated microbiota on P acquisition require further research. In this study, we investigated the roles of root purple APases (PAPs) and plant growth-promoting rhizobacteria in rhizosheath formation and P acquisition under conditions of soil drying (SD) and P treatment (+P: soil with P fertilizer; –P: soil without fertilizer). We expressed purple acid phosphatase12 (LaPAP12) in white lupin and rice (Oryza sativa) plants and analyzed the rhizosheath-associated microbiome. Increased or heterologous LaPAP12 expression promoted APase activity and rhizosheath formation, resulting in increased P acquisition mainly under SD–P conditions. It also increased the abundance of members of the genus Bacillus in the rhizosheath-associated microbial communities of white lupin and rice. We isolated a phosphate-solubilizing, auxin-producing Bacillus megaterium strain from the rhizosheath of white lupin and used this to inoculate white lupin and rice plants. Inoculation promoted rhizosheath formation and P acquisition, especially in plants with increased LaPAP12 expression and under SD–P conditions, suggesting a functional role of the bacteria in alleviating P deficit stress via rhizosheath formation. Together, our results suggest a synergistic enhancing effect of LaPAP12 and plant growth-promoting rhizobacteria on rhizosheath formation and P acquisition under SD–P conditions.
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- 2022
4. Sodium Accumulation in Infected Cells and Ion Transporters Mistargeting in Nodules of Medicago truncatula: Two Ugly Items That Hinder Coping with Salt Stress Effects
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Russian Foundation for Basic Research, Ministry of Science and Higher Education of the Russian Federation, Comunidad de Madrid, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), European Commission, Ministerio de Educación (España), Coba de la Peña, Teodoro [0000-0002-6354-297X], Pueyo, José Javier [0000-0003-0337-4078], Lucas, M. Mercedes [0000-0002-3252-0145], Trifonova, Natalia A., Kamyshinsky, Roman, Coba de la Peña, Teodoro, Koroleva, Maria I., Kulikova, Olga, Lara-Dampier, Victoria, Pashkovskiy, Pavel, Presniakov, Mikhail, Pueyo, José Javier, Lucas, M. Mercedes, Elena E. Fedorova, Russian Foundation for Basic Research, Ministry of Science and Higher Education of the Russian Federation, Comunidad de Madrid, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), European Commission, Ministerio de Educación (España), Coba de la Peña, Teodoro [0000-0002-6354-297X], Pueyo, José Javier [0000-0003-0337-4078], Lucas, M. Mercedes [0000-0002-3252-0145], Trifonova, Natalia A., Kamyshinsky, Roman, Coba de la Peña, Teodoro, Koroleva, Maria I., Kulikova, Olga, Lara-Dampier, Victoria, Pashkovskiy, Pavel, Presniakov, Mikhail, Pueyo, José Javier, Lucas, M. Mercedes, and Elena E. Fedorova
- Abstract
The maintenance of intracellular nitrogen-fixing bacteria causes changes in proteins’ location and in gene expression that may be detrimental to the host cell fitness. We hypothesized that the nodule’s high vulnerability toward salt stress might be due to alterations in mechanisms involved in the exclusion of Na+ from the host cytoplasm. Confocal and electron microscopy immunolocalization analyses of Na+/K+ exchangers in the root nodule showed the plasma membrane (MtNHX7) and endosome/tonoplast (MtNHX6) signal in non-infected cells; however, in mature infected cells the proteins were depleted from their target membranes and expelled to vacuoles. This mistargeting suggests partial loss of the exchanger’s functionality in these cells. In the mature part of the nodule 7 of the 20 genes encoding ion transporters, channels, and Na+/K+ exchangers were either not expressed or substantially downregulated. In nodules from plants subjected to salt treatments, low temperature-scanning electron microscopy and X-ray microanalysis revealed the accumulation of 5–6 times more Na+ per infected cell versus non-infected one. Hence, the infected cells’ inability to withstand the salt may be the integral result of preexisting defects in the localization of proteins involved in Na+ exclusion and the reduced expression of key genes of ion homeostasis, resulting in premature senescence and termination of symbiosis.
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- 2022
5. Antioxidant Response and Calcium-Dependent Protein Kinases Involvement in Canola (Brassica napus L.) Tolerance to Drought
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Agencia Estatal de Investigación (España), Ministerio de Ciencia, Innovación y Universidades (España), Pueyo, José Javier [0000-0003-0337-4078], Ahmadi, Hossein, Taleei, Alireza, Mohammadi, Valiollah, Pueyo, José Javier, Agencia Estatal de Investigación (España), Ministerio de Ciencia, Innovación y Universidades (España), Pueyo, José Javier [0000-0003-0337-4078], Ahmadi, Hossein, Taleei, Alireza, Mohammadi, Valiollah, and Pueyo, José Javier
- Abstract
Canola is an important temperate oil crop that can be severely affected by drought. Understanding the physiological and molecular mechanisms involved in canola tolerance to water deficit is essential to obtain drought-tolerant productive cultivars. To investigate the role of antioxidant response and the possible involvement of calcium-dependent protein kinases (CDPKs) in canola tolerance to drought, we analyzed four genotypes with different sensitivity to water stress. Leaf relative water content, canopy temperature, PSII efficiency, electrolyte leakage index and lipid peroxidation were used as indicators to classify the cultivars as drought-tolerant or drought-sensitive. Antioxidant enzymes superoxide dismutase, guaiacol peroxidase and catalase displayed significantly higher activities in drought-tolerant than in drought-sensitive cultivars subjected to water deficit, suggesting that the efficiency of the antioxidant response is essential in canola drought tolerance. The increased expression of genes BnaCDPK6 and BnaCDPK14 under drought conditions, their differential expression in drought-tolerant and drought-sensitive genotypes, and the presence of multiple cis-acting stress-related elements in their promoter regions suggest that CDPKs are part of the signaling pathways that regulate drought response in canola. We propose the BnaCDPK genes and their regulator elements as potential molecular targets to obtain drought-tolerant productive canola cultivars through breeding or genetic transformation.
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- 2022
6. Development of a Quality Index to Evaluate the Impact of Abiotic Stress in Saline Soils in the Geothermal Zone of Los Negritos, Michoacán, Mexico
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Instituto Politécnico Nacional (México), Agencia Estatal de Investigación (España), Ministerio de Ciencia, Innovación y Universidades (España), Consejo Superior de Investigaciones Científicas (España), Bahena-Osorio, Yanely, Franco-Hernández, Marina Olivia, Pueyo, José Javier, Vásquez-Murrieta, María Soledad, Instituto Politécnico Nacional (México), Agencia Estatal de Investigación (España), Ministerio de Ciencia, Innovación y Universidades (España), Consejo Superior de Investigaciones Científicas (España), Bahena-Osorio, Yanely, Franco-Hernández, Marina Olivia, Pueyo, José Javier, and Vásquez-Murrieta, María Soledad
- Abstract
In recent years, salinity-induced soil quality impairment and the misuse of management practices have led to the reduced productivity of agroecosystems. This has prompted a search for simple and effective agricultural management strategies that improve the sustainability of agricultural production through soil quality assessments. In this context, the objective of this study was to establish an integrated soil quality index (SQI) by assessing the influence of different types of abiotic stress in two different seasons, using physical, chemical and biological indicators at three sites in the geothermal zone of “Los Negritos”, Michoacán, Mexico. Thirty-nine indicators related to soil fertility attributes and C, N, P, and S cycling—identified as the total dataset (TDS)—were evaluated. Principal component analysis (PCA) and the Spearman correlation matrix (r2 ≥ 0.6) were used to calculate the SQI using an integrated quality index (IQI) equation, with the indicators total nitrogen (TN), cation exchange capacity (CEC), lithium (Li), and zinc (Zn) identified as the minimum dataset (MDS). Significantly higher SQI values related to the better performance of soil functions were detected during the rainy season.
- Published
- 2023
7. Lupin, a Unique Legume That Is Nodulated by Multiple Microsymbionts: The Role of Horizontal Gene Transfer
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Ministère de l’Enseignement Supérieur et de la Recherche Scientifique (Tunisie), Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Ministerio de Ciencia e Innovación (España), Consejo Superior de Investigaciones Científicas (España), Msaddak, Abdelhakim, Mars, Mohamed, Quiñones, Miguel Angel, Lucas, M. Mercedes, Pueyo, José Javier, Ministère de l’Enseignement Supérieur et de la Recherche Scientifique (Tunisie), Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Ministerio de Ciencia e Innovación (España), Consejo Superior de Investigaciones Científicas (España), Msaddak, Abdelhakim, Mars, Mohamed, Quiñones, Miguel Angel, Lucas, M. Mercedes, and Pueyo, José Javier
- Abstract
Lupin is a high-protein legume crop that grows in a wide range of edaphoclimatic conditions where other crops are not viable. Its unique seed nutrient profile can promote health benefits, and it has been proposed as a phytoremediation plant. Most rhizobia nodulating Lupinus species belong to the genus Bradyrhizobium, comprising strains that are phylogenetically related to B. cytisi, B. hipponenese, B. rifense, B. iriomotense/B. stylosanthis, B. diazoefficiens, B. japonicum, B. canariense/B. lupini, and B. retamae/B. valentinum. Lupins are also nodulated by fast-growing bacteria within the genera Microvirga, Ochrobactrum, Devosia, Phyllobacterium, Agrobacterium, Rhizobium, and Neorhizobium. Phylogenetic analyses of the nod and nif genes, involved in microbial colonization and symbiotic nitrogen fixation, respectively, suggest that fast-growing lupin-nodulating bacteria have acquired their symbiotic genes from rhizobial genera other than Bradyrhizobium. Horizontal transfer represents a key mechanism allowing lupin to form symbioses with bacteria that were previously considered as non-symbiotic or unable to nodulate lupin, which might favor lupin’s adaptation to specific habitats. The characterization of yet-unstudied Lupinus species, including microsymbiont whole genome analyses, will most likely expand and modify the current lupin microsymbiont taxonomy, and provide additional knowledge that might help to further increase lupin’s adaptability to marginal soils and climates.
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- 2023
8. The Beneficial Effects of Inoculation with Selected Nodule-Associated PGPR on White Lupin Are Comparable to Those of Inoculation with Symbiotic Rhizobia
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Ministère de l’Enseignement Supérieur et de la Recherche Scientifique (Tunisie), Agencia Estatal de Investigación (España), Ministerio de Ciencia, Innovación y Universidades (España), Consejo Superior de Investigaciones Científicas (España), Msaddak, Abdelhakim, Quiñones, Miguel Angel, Mars, Mohamed, Pueyo, José Javier, Ministère de l’Enseignement Supérieur et de la Recherche Scientifique (Tunisie), Agencia Estatal de Investigación (España), Ministerio de Ciencia, Innovación y Universidades (España), Consejo Superior de Investigaciones Científicas (España), Msaddak, Abdelhakim, Quiñones, Miguel Angel, Mars, Mohamed, and Pueyo, José Javier
- Abstract
Nodule endophytes and associated bacteria are non-symbiotic bacteria that colonize legume nodules. They accompany nodulating rhizobia and can form beneficial associations, as some of them are plant growth-promoting rhizobacteria (PGPR) that are able to promote germination and plant growth and increase tolerance to biotic and abiotic stress. White lupin (Lupinus albus) is a legume crop that is gaining relevance as a suitable alternative to soybean as a plant protein source. Eleven nodule-associated bacteria were isolated from white lupin nodules grown in a Tunisian soil. They belonged to the genera Rhizobium, Ensifer, Pseudomonas and Bacillus. Their plant growth-promoting (PGP) and enzymatic activities were tested in vitro. Strains Pseudomonas sp., L1 and L12, displayed most PGP activities tested, and were selected for in planta assays. Inoculation with strains L1 or L12 increased seed germination and had the same positive effects on all plant growth parameters as did inoculation with symbiotic Bradyrhizobium canariense, with no significant differences among treatments. Inoculation with efficient nitrogen-fixing rhizobia must compete with rhizobia present in the soil that sometimes nodulate efficiently but fix nitrogen poorly, leading to a low response to inoculation. In such cases, inoculation with highly effective PGPR might represent a feasible alternative to boost crop productivity.
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- 2023
9. Table_1_Genome-Wide Association Study Reveals Complex Genetic Architecture of Cadmium and Mercury Accumulation and Tolerance Traits in Medicago truncatula.xlsx
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Paape, Timothy, Heiniger, Benjamin, Santo Domingo, Miguel, Clear, Michael R., Lucas, M. Mercedes, Pueyo, José Javier, Paape, Timothy, Heiniger, Benjamin, Santo Domingo, Miguel, Clear, Michael R., Lucas, M. Mercedes, and Pueyo, José Javier
- Abstract
Heavy metals are an increasing problem due to contamination from human sources that and can enter the food chain by being taken up by plants. Understanding the genetic basis of accumulation and tolerance in plants is important for reducing the uptake of toxic metals in crops and crop relatives, as well as for removing heavy metals from soils by means of phytoremediation. Following exposure of Medicago truncatula seedlings to cadmium (Cd) and mercury (Hg), we conducted a genome-wide association study using relative root growth (RRG) and leaf accumulation measurements. Cd and Hg accumulation and RRG had heritability ranging 0.44 – 0.72 indicating high genetic diversity for these traits. The Cd and Hg trait associations were broadly distributed throughout the genome, indicated the traits are polygenic and involve several quantitative loci. For all traits, candidate genes included several membrane associated ATP-binding cassette transporters, P-type ATPase transporters, oxidative stress response genes, and stress related UDP-glycosyltransferases. The P-type ATPase transporters and ATP-binding cassette protein-families have roles in vacuole transport of heavy metals, and our findings support their wide use in physiological plant responses to heavy metals and abiotic stresses. We also found associations between Cd RRG with the genes CAX3 and PDR3, two linked adjacent genes, and leaf accumulation of Hg associated with the genes NRAMP6 and CAX9. When plant genotypes with the most extreme phenotypes were compared, we found significant divergence in genomic regions using population genomics methods that contained metal transport and stress response gene ontologies. Several of these genomic regions show high linkage disequilibrium (LD) among candidate genes suggesting they have evolved together. Minor allele frequency (MAF) and effect size of the most significant SNPs was negatively correlated with large effect alleles being most rare. This is consistent with purifying selecti
- Published
- 2022
10. Data_Sheet_1_Genome-Wide Association Study Reveals Complex Genetic Architecture of Cadmium and Mercury Accumulation and Tolerance Traits in Medicago truncatula.pdf
- Author
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Paape, Timothy, Heiniger, Benjamin, Santo Domingo, Miguel, Clear, Michael R., Lucas, M. Mercedes, Pueyo, José Javier, Paape, Timothy, Heiniger, Benjamin, Santo Domingo, Miguel, Clear, Michael R., Lucas, M. Mercedes, and Pueyo, José Javier
- Abstract
Heavy metals are an increasing problem due to contamination from human sources that and can enter the food chain by being taken up by plants. Understanding the genetic basis of accumulation and tolerance in plants is important for reducing the uptake of toxic metals in crops and crop relatives, as well as for removing heavy metals from soils by means of phytoremediation. Following exposure of Medicago truncatula seedlings to cadmium (Cd) and mercury (Hg), we conducted a genome-wide association study using relative root growth (RRG) and leaf accumulation measurements. Cd and Hg accumulation and RRG had heritability ranging 0.44 – 0.72 indicating high genetic diversity for these traits. The Cd and Hg trait associations were broadly distributed throughout the genome, indicated the traits are polygenic and involve several quantitative loci. For all traits, candidate genes included several membrane associated ATP-binding cassette transporters, P-type ATPase transporters, oxidative stress response genes, and stress related UDP-glycosyltransferases. The P-type ATPase transporters and ATP-binding cassette protein-families have roles in vacuole transport of heavy metals, and our findings support their wide use in physiological plant responses to heavy metals and abiotic stresses. We also found associations between Cd RRG with the genes CAX3 and PDR3, two linked adjacent genes, and leaf accumulation of Hg associated with the genes NRAMP6 and CAX9. When plant genotypes with the most extreme phenotypes were compared, we found significant divergence in genomic regions using population genomics methods that contained metal transport and stress response gene ontologies. Several of these genomic regions show high linkage disequilibrium (LD) among candidate genes suggesting they have evolved together. Minor allele frequency (MAF) and effect size of the most significant SNPs was negatively correlated with large effect alleles being most rare. This is consistent with purifying selecti
- Published
- 2022
11. Genome-wide association study reveals complex genetic architecture of cadmium and mercury accumulation and tolerance traits in Medicago truncatula
- Author
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Brookhaven National Laboratory (US), Department of Energy (US), Biological and Environmental Research (US), Consejo Superior de Investigaciones Científicas (España), Ministerio de Economía y Competitividad (España), Agencia Estatal de Investigación (España), Ministerio de Ciencia, Innovación y Universidades (España), Paape, Timothy, Heiniger, Benjamin, Santo Domingo, Miguel, Clear, Michael R., Lucas, M. Mercedes, Pueyo, José Javier, Brookhaven National Laboratory (US), Department of Energy (US), Biological and Environmental Research (US), Consejo Superior de Investigaciones Científicas (España), Ministerio de Economía y Competitividad (España), Agencia Estatal de Investigación (España), Ministerio de Ciencia, Innovación y Universidades (España), Paape, Timothy, Heiniger, Benjamin, Santo Domingo, Miguel, Clear, Michael R., Lucas, M. Mercedes, and Pueyo, José Javier
- Abstract
Heavy metals are an increasing problem due to contamination from human sources that and can enter the food chain by being taken up by plants. Understanding the genetic basis of accumulation and tolerance in plants is important for reducing the uptake of toxic metals in crops and crop relatives, as well as for removing heavy metals from soils by means of phytoremediation. Following exposure of Medicago truncatula seedlings to cadmium (Cd) and mercury (Hg), we conducted a genome-wide association study using relative root growth (RRG) and leaf accumulation measurements. Cd and Hg accumulation and RRG had heritability ranging 0.44 – 0.72 indicating high genetic diversity for these traits. The Cd and Hg trait associations were broadly distributed throughout the genome, indicated the traits are polygenic and involve several quantitative loci. For all traits, candidate genes included several membrane associated ATP-binding cassette transporters, P-type ATPase transporters, oxidative stress response genes, and stress related UDP-glycosyltransferases. The P-type ATPase transporters and ATP-binding cassette protein-families have roles in vacuole transport of heavy metals, and our findings support their wide use in physiological plant responses to heavy metals and abiotic stresses. We also found associations between Cd RRG with the genes CAX3 and PDR3, two linked adjacent genes, and leaf accumulation of Hg associated with the genes NRAMP6 and CAX9. When plant genotypes with the most extreme phenotypes were compared, we found significant divergence in genomic regions using population genomics methods that contained metal transport and stress response gene ontologies. Several of these genomic regions show high linkage disequilibrium (LD) among candidate genes suggesting they have evolved together. Minor allele frequency (MAF) and effect size of the most significant SNPs was negatively correlated with large effect alleles being most rare. This is consistent with purifying selecti
- Published
- 2022
12. LC-HRMS based metabolomics to understand mercury tolerance in plants: Are flavonoids doing the trick?
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Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Álvarez-Rivera, Gerardo, Sanz, Aurora, Cifuentes, Alejandro, Ibáñez, Elena, Paape, Timothy, Lucas, M. Mercedes, Pueyo, José Javier, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Álvarez-Rivera, Gerardo, Sanz, Aurora, Cifuentes, Alejandro, Ibáñez, Elena, Paape, Timothy, Lucas, M. Mercedes, and Pueyo, José Javier
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- 2022
13. Flavonoid accumulation varies in Medicago truncatula in response to mercury stress
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Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Ministerio de Economía y Competitividad (España), CSIC - Unidad de Recursos de Información Científica para la Investigación (URICI), Álvarez-Rivera, Gerardo, Sanz, Aurora, Cifuentes, Alejandro, Ibáñez, Elena, Paape, Timothy, Lucas, M. Mercedes, Pueyo, José Javier, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Ministerio de Economía y Competitividad (España), CSIC - Unidad de Recursos de Información Científica para la Investigación (URICI), Álvarez-Rivera, Gerardo, Sanz, Aurora, Cifuentes, Alejandro, Ibáñez, Elena, Paape, Timothy, Lucas, M. Mercedes, and Pueyo, José Javier
- Abstract
Mercury (Hg) contamination is increasing worldwide in both wild ecosystems and agricultural soils due to natural processes, but mostly to anthropic activities. The molecular mechanisms involved in Hg toxicity and tolerance in plants have been extensively studied; however, the role of flavonoids in response to Hg stress remains to be investigated. We conducted a metabolomic study to analyze the changes induced at the secondary metabolite level in three Hg-tolerant and one Hg-sensitive Medicago truncatula cultivars. A total of 46 flavonoid compounds, classified into five different flavonoid families: anthocyanidins, flavones, isoflavones, pterocarpan flavonoids, and flavanones, along with their respective glycoconjugate derivatives, were identified in leaf and root tissues. The synthesis of free isoflavones, followed by monoglycosylation and further malonylation was shown to be characteristic of root samples, whereas higher glycosylation, followed by further acylation with coumaric and ferulic acid was characteristic of leaf tissues. While minor changes were observed in leaves, significant quantitative changes could be observed in roots upon Hg treatment. Some flavonoids were strongly upregulated in roots, including malonylglucosides of biochanin A, formononetin and medicarpin, and aglycones biochanin, daidzein, and irisolidone. Hg tolerance appeared to be mainly associated to the accumulation of formononetin MalGlc, tricin GlcAGlcA, and afrormosin Glc II in leaves, whereas aglycone accumulation was associated with tolerance to Hg stress in roots. The results evidence the alteration of the flavonoid metabolic profile and their glycosylation processes in response to Hg stress. However, notable differences existed between varieties, both in the basal metabolic profile and in the response to treatment with Hg. Overall, we observed an increase in flavonoid production in response to Hg stress, and Hg tolerance appeared to be associated to a characteristic glycosylation pat
- Published
- 2022
14. Impacto de la corioamnionitis en la evolución del recién nacido de muy bajo peso: estudio de cohortes histórico
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Jaulín Pueyo, José Javier, Rite Gracia, Segundo, and Samper Villagrasa, María Pilar
- Abstract
Introducción: La corioamnionitis es la inflamación de las membranas y el corion placentario. Aunquesu incidencia en la literatura es heterogénea, se estima que afecta al 4% de todas las gestaciones.Su etiología puede ser tanto infecciosa, como exclusivamente inflamatoria, siendo la fiebre el signoguía. La repercusión de esta entidad en el periodo neonatal no ha sido todavía esclarecida.Objetivos: Conocer las características clínicas de los recién nacidos de muy bajo peso conantecedentes de corioamnionitis clínica, analizar la influencia de la corioamnionitis en la evolución delos pacientes y comparar los resultados con la literatura disponible.Material y métodos: Se ha realizado un estudio observacional, de cohortes histórico. Se hanrecogido datos epidemiológicos, clínicos y analíticos de la muestra; compuesta por recién nacidoscon muy bajo peso al nacimiento (Neonatología. Estos datos se han tratado mediante análisis bivariante y multivariante para obtenerlos resultados.Resultados: Con una muestra de 311 casos en la que el 13% de los pacientes cumplía criteriosclínicos de corioamnionitis; se comprobó asociación de esta con la displasia broncopulmonar (RR1,97; p0,01), el ductus arterioso persistente (RR 1,77; p0,01), la hemorragia intraventricular (RR 1,69;p0,01) y la retinopatía del prematuro tributaria de tratamiento (RR 5,06; p0,00). El modelomultivariante no mostró que la corioamnionitis clínica fuera un factor de riesgo independiente.Conclusiones: La corioamnionitis clínica en nuestro medio no resultó ser un factor de riesgoindependiente para la patología neonatal estudiada.
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- 2022
15. LC-HRMS based metabolomics to understand mercury tolerance in plants: Are flavonoids doing the trick?
- Author
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Álvarez-Rivera, Gerardo, Sanz, Aurora, Cifuentes, Alejandro, Ibáñez, Elena, Paape, Timothy, Lucas, M. Mercedes, Pueyo, José Javier, Ministerio de Ciencia, Innovación y Universidades (España), and Agencia Estatal de Investigación (España)
- Abstract
Resumen del trabajo presentado a la XXI Reunión Científica de la Sociedad Española de Cromatografía y Técnicas Afines (SECyTA), celebrada en Almería del 25 al 27 de octubre de 2022., This research was supported by grants from Agencia Estatal de Investigación, Spain (AGL2017-88381-R and PID2021-125371OB-I00) to JJP and MML. GA-R would like to acknowledge the Ministry of Economy and Competitiveness for a “Juan de la Cierva-Incorporación” postdoctoral grant.
- Published
- 2022
16. Los Robots de asistencia social en la atención a la población mayor de Japón
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Aresté Pueyo, José Javier and Gil Lacruz, Marta
- Abstract
Introducción: El envejecimiento demográfico constituye uno de los desafíos más relevantes que enfrentan nuestras sociedades del siglo XXI. Esta situación, genera una creciente demanda de atención a las personas mayores a la vez que disminuye el personal necesario. Entre las diversas soluciones que se están investigando para abordar esta escasez, destacamos el uso de los robots para apoyar al personal en su labor. Desde el ámbito de la gerontología social, el presente estudio se enfoca en las intervenciones con Robots de Asistencia Social en Japón, al ser el país con mayor envejecimiento demográfico en la actualidad y el mayor promotor de la robótica asistencial desde el ámbito gubernamental.Metodología: Para realizar la búsqueda de los artículos se utilizó la declaración PRISMA. Se utilizaron las bases de datos electrónicas de Cochrane Library, PubMed, Scopus y Web of Sciences. Según la estrategia de búsqueda se obtuvieron 144 resultados.Resultados y discusión: 7 artículos cumplieron los requisitos de inclusión y exclusión, y todos fueron ensayos clínicos redactados en inglés. Las intervenciones fueron muy diversas, incluyendo el fomento de las interacciones verbales, las habilidades no verbales, la administración de evaluaciones cognitivas y el estudio del impacto del sexo, edad y estado de demencia en las intervenciones con Robots de Asistencia Social en personas mayores. Implementar una perspectiva ética en esta clase de intervenciones es fundamental para salvaguardar la dignidad y los derechos de las personas mayores.Conclusiones: Los Robots de Asistencia Social son una herramienta útil para atender las demandas de la población mayor y mejorar su bienestar. El sector más beneficiado en este estudio son las personas mayores con deterioro cognitivo leve. La experiencia y planificación a largo plazo que está realizando Japón para adaptarse al envejecimiento demográfico le convierten en un referente para países en situaciones similares como España. Palabras clave: "robots de Asistencia Social"; "deterioro cognitivo"; "Japón";"envejecimiento de la población".
- Published
- 2022
17. Nitrogen and Phosphorus Interplay in Lupin Root Nodules and Cluster Roots
- Author
-
Agencia Estatal de Investigación (España), Russian Foundation for Basic Research, Consejo Superior de Investigaciones Científicas (España), CSIC - Unidad de Recursos de Información Científica para la Investigación (URICI), Pueyo, José Javier, Quiñones, Miguel Angel, Coba de la Peña, Teodoro, Fedorova, Elena E., Lucas, M. Mercedes, Agencia Estatal de Investigación (España), Russian Foundation for Basic Research, Consejo Superior de Investigaciones Científicas (España), CSIC - Unidad de Recursos de Información Científica para la Investigación (URICI), Pueyo, José Javier, Quiñones, Miguel Angel, Coba de la Peña, Teodoro, Fedorova, Elena E., and Lucas, M. Mercedes
- Abstract
Nitrogen (N) and phosphorus (P) are two major plant nutrients, and their deficiencies often limit plant growth and crop yield. The uptakes of N or P affect each other, and consequently, understanding N–P interactions is fundamental. Their signaling mechanisms have been studied mostly separately, and integrating N–P interactive regulation is becoming the aim of some recent works. Lupins are singular plants, as, under N and P deficiencies, they are capable to develop new organs, the N2-fixing symbiotic nodules, and some species can also transform their root architecture to form cluster roots, hundreds of short rootlets that alter their metabolism to induce a high-affinity P transport system and enhance synthesis and secretion of organic acids, flavonoids, proteases, acid phosphatases, and proton efflux. These modifications lead to mobilization in the soil of, otherwise unavailable, P. White lupin (Lupinus albus) represents a model plant to study cluster roots and for understanding plant acclimation to nutrient deficiency. It tolerates simultaneous P and N deficiencies and also enhances uptake of additional nutrients. Here, we present the structural and functional modifications that occur in conditions of P and N deficiencies and lead to the organogenesis and altered metabolism of nodules and cluster roots. Some known N and P signaling mechanisms include different factors, including phytohormones and miRNAs. The combination of the individual N and P mechanisms uncovers interactive regulation pathways that concur in nodules and cluster roots. L. albus interlinks N and P recycling processes both in the plant itself and in nature.
- Published
- 2021
18. Adaptive Mechanisms Make Lupin a Choice Crop for Acidic Soils Affected by Aluminum Toxicity
- Author
-
Agencia Estatal de Investigación (España), Consejo Superior de Investigaciones Científicas (España), CSIC - Unidad de Recursos de Información Científica para la Investigación (URICI), Quiñones, Miguel Angel, Lucas, M. Mercedes, Pueyo, José Javier, Agencia Estatal de Investigación (España), Consejo Superior de Investigaciones Científicas (España), CSIC - Unidad de Recursos de Información Científica para la Investigación (URICI), Quiñones, Miguel Angel, Lucas, M. Mercedes, and Pueyo, José Javier
- Abstract
Almost half of the world’s agricultural soils are acidic, and most of them present significant levels of aluminum (Al) contamination, with Al3+ as the prevailing phytotoxic species. Lupin is a protein crop that is considered as an optimal alternative to soybean cultivation in cold climates. Lupins establish symbiosis with certain soil bacteria, collectively known as rhizobia, which are capable of fixing atmospheric nitrogen. Moreover, some lupin species, especially white lupin, form cluster roots, bottlebrush-like structures specialized in the mobilization and uptake of nutrients in poor soils. Cluster roots are also induced by Al toxicity. They exude phenolic compounds and organic acids that chelate Al to form non-phytotoxic complexes in the rhizosphere and inside the root cells, where Al complexes are accumulated in the vacuole. Lupins flourish in highly acidic soils where most crops, including other legumes, are unable to grow. Some lupin response mechanisms to Al toxicity are common to other plants, but lupin presents specific tolerance mechanisms, partly as a result of the formation of cluster roots. Al-induced lupin organic acid secretion differs from P-induced secretion, and organic acid transporters functions differ from those in other legumes. Additionally, symbiotic rhizobia can contribute to Al detoxification. After revising the existing knowledge on lupin distinct Al tolerance mechanisms, we conclude that further research is required to elucidate the specific organic acid secretion and Al accumulation mechanisms in this unique legume, but definitely, white lupin arises as a choice crop for cultivation in Al-rich acidic soils in temperate climate regions.
- Published
- 2021
19. CRISPR-Cas9: El futuro de la terapia génica y de la medicina personalizada
- Author
-
Jaulín Pueyo, José Javier, Barrio Ollero, Eva, and Lerma Puertas, Diego
- Abstract
Desde su descubrimiento hace algo más de dos décadas como mecanismo inmunitario en las bacterias, los sistemas CRISPR-Cas se han convertido en la técnica de edición genética de vanguardia. Dadas las prometedoras cualidades de esta tecnología y su ambicioso horizonte de aplicaciones, numerosas líneas de investigación se han abierto tanto para intentar salvar las limitaciones de su uso (fundamentalmente aumentando el rendimiento a la vez que se evitan las modificaciones no deseadas u “off-target”), como para empezar a probarla frente a las principales enfermedades candidatas a terapia génica. El considerable número de publicaciones que han aparecido durante los últimos años avala la relevancia de este tema de actualidad en campos como el de la medicina o el de la bioética. En este trabajo analizamos la literatura disponible para exponer el desarrollo de esta tecnología hasta la fecha y las razones por las que constituye un avance con tanto potencial como polémica a sus espaldas.
- Published
- 2019
20. Efficient rhizobacteria promote growth and alleviate NaCl-induced stress in the plant species Sulla carnosa
- Author
-
Hmaeid, Nizar, Wali, Mariem, Metoui-Ben Mahmoud, O., Pueyo, José Javier, Ghnaya, Tahar, Abdelly, Chedly, Hmaeid, Nizar, Wali, Mariem, Metoui-Ben Mahmoud, O., Pueyo, José Javier, Ghnaya, Tahar, and Abdelly, Chedly
- Published
- 2019
21. Arbuscular mycorrhizal fungus and rhizobacteria affect the physiology and performance of Sulla coronaria plants subjected to salt stress by mitigation of ionic imbalance
- Author
-
Ministerio de Economía y Competitividad (España), Ministère de l’Enseignement Supérieur et de la Recherche Scientifique (Tunisie), Hidri, Rabaa, Metoui-Ben Mahmoud, O., Farhat, Nejia, Cordero, Irene, Pueyo, José Javier, Debez, Ahmed, Barea Navarro, José Miguel, Abdelly, Chédly, Azcón González de Aguilar, Rosario, Ministerio de Economía y Competitividad (España), Ministère de l’Enseignement Supérieur et de la Recherche Scientifique (Tunisie), Hidri, Rabaa, Metoui-Ben Mahmoud, O., Farhat, Nejia, Cordero, Irene, Pueyo, José Javier, Debez, Ahmed, Barea Navarro, José Miguel, Abdelly, Chédly, and Azcón González de Aguilar, Rosario
- Abstract
Salt stress has become a major menace to plant growth and productivity. The main goal of this study was to investigate the effect of inoculation with the arbuscular mycorrhizal fungi (AMF; Rhizophagus intraradices) in combination or not with plant growth‐promoting rhizobacteria (PGPR; Pseudomonas sp. (Ps) and Bacillus subtilis) on the establishment and growth of Sulla coronaria plants under saline conditions. Pot experiments were conducted in a greenhouse and S. coronaria seedlings were stressed with NaCl (100 mM) for 4 weeks. Plant biomass, mineral nutrition of shoots and activities of rhizosphere soil enzymes were assessed. Salt stress significantly reduced plant growth while increasing sodium accumulation and electrolyte leakage from leaves. However, inoculation with AMF, whether alone or combined with the PGPR Pseudomonas sp. alleviated the salt‐induced reduction of dry weight. Inoculation with only AMF increased shoot nutrient concentrations resulting in higher K+: Na+, Ca2+: Na+, and Ca2+: Mg2+ ratios compared to the non‐inoculated plants under saline conditions. The co‐inoculation with AMF and Pseudomonas sp. under saline conditions lowered shoot sodium accumulation, electrolyte leakage and malondialdehyde (MDA) levels compared to non‐inoculated plants and plants inoculated only with AMF. The findings strongly suggest that inoculation with AMF alone or co‐inoculation with AMF and Pseudomonas sp. can alleviate salt stress of plants likely through mitigation of NaCl‐induced ionic imbalance, thereby improving the nutrient profile.
- Published
- 2019
22. Mercury tolerance of white lupin growing in soils of the Almadén Mining District
- Author
-
Quiñones, Miguel Angel, Fajardo, Susana, Rodríguez-Caviedes, Laura, Hortigüela, Claudia, Contreras, Miguel, Lucas, María Marcedes, Pueyo, José Javier, Fernández-Pascual, Mercedes, Quiñones, Miguel Ángel [0000-0002-8814-0440], Ministerio de Economía y Competitividad (España), Consejo Superior de Investigaciones Científicas (España), and Quiñones, Miguel Ángel
- Subjects
education - Abstract
Trabajo presentado en el 1st Mercury Symposium, celebrado en Almadén, Ciudad Real (España), en 2017
- Published
- 2018
23. Understanding the legume-rhizobia symbioses: key role of microscopy techniques
- Author
-
Lucas, M. Mercedes, Lara-Dampier, Victoria, Fedorova, Elena E., Morcillo, César N., Fajardo, Susana, Pallol, Beatriz, Fernández-Pascual, Mercedes, Pueyo, José Javier, and Ministerio de Economía y Competitividad (España)
- Abstract
Trabajo presentado en el Spanish Portuguese Meeting for Advanced Optical Microscopy (SPAOM), celebrado en Granada (España), del 24 al 26 de octubre de 2018, The symbiotic association between certain soil bacteria (rhizobia) and most legumes leads to the formation of root nodules, symbiotic organs in which the fixation of atmospheric nitrogen takes place. This symbiosis is significantly important for the nitrogen input in both agricultural and natural ecosystems, but it can be affected by environmental stresses. Nodulation is a complex process not completely understood; some features differ depending on the legume, and they lead to distinct nodule types. After a specific recognition between the symbionts through the exchange of bacterial and plant signalling molecules, the nodule primordium is induced and rhizobia enter the root cortex and infect cells of this primordium. Bacteria are released into the host cell surrounded by a plantderived membrane and form a new cellular compartment, the symbiosome, which is a nitrogen-fixing microfactory. Based on several characteristics of the symbiosome including its metabolic behaviour, the composite origin of the membrane, the cytoskeletal dynamics and symbiosome segregation during the division of rhizobia-infected cells in certain legume nodules, symbiosome can be considered an organelle-like 1 . Legume nodules are probably one of the most fascinating plant organs. They have been studied for more than a century, and microscopy techniques have been and will be key tools to enhance our understanding of this symbiosis. We will present examples of how microscopy techniques (light, fluorescence, laser confocal, TEM, LTSEM and X-Ray microanalysis, etc.) have been essential to elucidate different aspects of nodule development, structure and functioning, as well as its response to abiotic stress., This work was supported by a grant from MINECO/AEI AGL2017-88381-R.
- Published
- 2018
24. Tolerancia al mercurio de variedades de Lupinus albus inoculadas con Bradyrhizobium en suelos contaminados por mercurio
- Author
-
Quiñones, Miguel Angel, Fajardo, Susana, Rodríguez-Caviedes, Laura, Hortigüela, Claudia, Contreras, Miguel, López-Berdonces, M. A., Esbrí, J. M., Higueras, Pablo, Coba de la Peña, Teodoro, Lucas, M. Mercedes, Pueyo, José Javier, Fernández-Pascual, Mercedes, Ministerio de Economía y Competitividad (España), and Consejo Superior de Investigaciones Científicas (España)
- Abstract
Trabajo presentado en la III Conferencia Iberoamericana de Interacciones Beneficiosas Microorganismo-Planta-Ambiente (IBEMPA), celebrada en Lima (Perú), del 6 al 10 de noviembre de 2017, En nuestro grupo se está estudiando el potencial fitorremediador de suelos contaminados por metales pesados de la simbiosis leguminosa-rizobio. Se ha demostrado, en cultivo semi-hidropónico y concentraciones entre 0 y 200 ¿M de HgCl2 en la solución de riego, que la inoculación de plantas de altramuz (L. albus) con la cepa L-7AH de Bradyrhizobium canariense, tolerante al mercurio, confiere a las plantas la capacidad de desarrollarse en presencia de este metal pesado y acumularlo en altas concentraciones, especialmente en raíces y nódulos. Crecimiento, eficiencia fotosintética y actividad nitrogenasa de las plantas inoculadas con L-7AH eran similares a los de las plantas control (sin Hg), mientras que en las inoculadas con la cepa sensible, L-3, todos los parámetros disminuían significativamente y apenas acumulaban Hg. Estos resultados sugerían que la simbiosis L. albus-B. canariense L-7AH podría ser útil para la fitorremediación, mediante fitoestabilización, de suelos contaminados por Hg. Para evaluar la capacidad fitorremediadora de estas plantas, se utilizaron suelos de las localidades de Almadenejos y Las Cuevas (Ciudad Real, España) con diferentes contenidos totales en Hg (22 y 2.6 g kg-1, respectivamente), que se mezclaron con vermiculita (1:1) para evitar su compactación. Se sembraron semillas de altramuz de las variedades G1 y N1 y se inocularon con B. canariense L-7AH, o L-3, o no se inocularon. Tras 6 semanas de riego con agua estéril, todas las plantas mostraban un aspecto similar. Se midieron parámetros de crecimiento, fotosíntesis, actividades enzimáticas del metabolismo antioxidante y nitrogenasa, sin encontrar diferencias significativas. El análisis físico-químico de los suelos, sin embargo, mostró que éstos presentaban una gran diferencia en su pH, siendo 6.9 el de Almadenejos y 5.1 el de Las Cuevas, lo cual afecta al porcentaje de Hg ligado a ácidos húmicos que es del 2.1% y del 13.1%, respectivamente. En esas condiciones, la concentración de Hg biodisponible es probablemente muy similar en ambos suelos, lo que explicaría los resultados del presente ensayo., Agradecemos la financiación a MINECO (AGL2013-40758-R) y CSIC i-COOP (2016SU0005).
- Published
- 2017
25. Response of legumes, rhizobia and their symbiosis to toxic heavy metals
- Author
-
Lucas, M. Mercedes, Lara-Dampier, Victoria, Coba de la Peña, Teodoro, Fedorova, Elena E., Pallol, Beatriz, Fajardo, Susana, Quiñones, Miguel Angel, Fernández-Pascual, Mercedes, Pueyo, José Javier, Ministerio de Economía y Competitividad (España), and Consejo Superior de Investigaciones Científicas (España)
- Subjects
Transporters ,food and beverages ,Homeostasis ,Mercury ,Redox metabolism ,Detoxification ,Cadmium - Abstract
Trabajo presentado en la III Conferencia Iberoamericana de Interacciones Beneficiosas Microorganismo-Planta-Ambiente (IBEMPA), celebrada en Lima (Perú), del 6 al 10 de noviembre de 2017, Pollution of soils with toxic heavy metals is increasing over the world due mainly to anthropogenic activities. Natural soils containing high levels of heavy metals also exist. In polluted soils, plant production for food and feed is a risk for human and animal health. To overcome this problem two strategies have been proposed: soil bioremediation with plants and their associated microorganisms, and culture of plants with low capability to translocate heavy metals to the edible parts. Legumes are promising candidates for these proposals; in fact, legumes inoculated with rhizobia isolated from heavy metal-polluted soils have been successfully used in polluted soils. Plants and microorganisms display mechanisms of response to toxic heavy metal stress, which included uptake, translocation and accumulation of the metal to avoid toxic effects of the metals. Structural and ultrastructural alterations of cells and tissues are also responses to heavy metals. In bacteria and plants upon heavy metal stress, common responses to another abiotic stresses (imbalance of the redox homeostasis, hormonal alteration, etc.) and more specific responses (transporters, detoxification by proteins and enzymes, etc.) can be found. Studies of transcriptomic, proteomic, metabolomic, ionomic, etc. are revealing new factors involved in these responses. These new approaches might help to draw the network of molecular, biochemical and physiological changes that allow the maintenance of the cellular homeostasis and the metabolic reprogramming. So far, the responses of legumes, rhizobia and their symbiosis to toxic heavy metals have not been extensively studied. A better knowledge of these responses will allow the selection of more tolerant rhizobialegume partners. We will present an overview of the responses of legumes and their microsymbionts to heavy metals, mainly focused on cadmium and mercury. We will present and discuss our results on Medicago, Lupinus, Ensifer and Bradyrhizobium and on their symbiosis., MINECO (AGL2013-40758-R) and i-COOP CSIC (2016SU0005).
- Published
- 2017
26. Mercury tolerance of white lupin growing in soils of the Almadén Mining District
- Author
-
Quiñones, Miguel Ángel [0000-0002-8814-0440], Quiñones, Miguel Angel, Fajardo, Susana, Rodríguez-Caviedes, Laura, Hortigüela, Claudia, Contreras, Miguel, Lucas, María Marcedes, Pueyo, José Javier, Fernández-Pascual, Mercedes, Quiñones, Miguel Ángel [0000-0002-8814-0440], Quiñones, Miguel Angel, Fajardo, Susana, Rodríguez-Caviedes, Laura, Hortigüela, Claudia, Contreras, Miguel, Lucas, María Marcedes, Pueyo, José Javier, and Fernández-Pascual, Mercedes
- Published
- 2018
27. Mercury tolerance of white lupin growing in soils of the Almadén Mining District
- Author
-
Ministerio de Economía y Competitividad (España), Consejo Superior de Investigaciones Científicas (España), Quiñones, Miguel Angel, Fajardo, Susana, Rodríguez-Caviedes, Laura, Hortigüela, Claudia, Contreras, Miguel, Lucas, M. Mercedes, Pueyo, José Javier, Fernández-Pascual, Mercedes, Ministerio de Economía y Competitividad (España), Consejo Superior de Investigaciones Científicas (España), Quiñones, Miguel Angel, Fajardo, Susana, Rodríguez-Caviedes, Laura, Hortigüela, Claudia, Contreras, Miguel, Lucas, M. Mercedes, Pueyo, José Javier, and Fernández-Pascual, Mercedes
- Published
- 2018
28. Understanding the legume-rhizobia symbioses: key role of microscopy techniques
- Author
-
Ministerio de Economía y Competitividad (España), Lucas, M. Mercedes, Lara-Dampier, Victoria, Fedorova, Elena E., Morcillo, César N., Fajardo, Susana, Pallol, Beatriz, Fernández-Pascual, Mercedes, Pueyo, José Javier, Ministerio de Economía y Competitividad (España), Lucas, M. Mercedes, Lara-Dampier, Victoria, Fedorova, Elena E., Morcillo, César N., Fajardo, Susana, Pallol, Beatriz, Fernández-Pascual, Mercedes, and Pueyo, José Javier
- Abstract
The symbiotic association between certain soil bacteria (rhizobia) and most legumes leads to the formation of root nodules, symbiotic organs in which the fixation of atmospheric nitrogen takes place. This symbiosis is significantly important for the nitrogen input in both agricultural and natural ecosystems, but it can be affected by environmental stresses. Nodulation is a complex process not completely understood; some features differ depending on the legume, and they lead to distinct nodule types. After a specific recognition between the symbionts through the exchange of bacterial and plant signalling molecules, the nodule primordium is induced and rhizobia enter the root cortex and infect cells of this primordium. Bacteria are released into the host cell surrounded by a plantderived membrane and form a new cellular compartment, the symbiosome, which is a nitrogen-fixing microfactory. Based on several characteristics of the symbiosome including its metabolic behaviour, the composite origin of the membrane, the cytoskeletal dynamics and symbiosome segregation during the division of rhizobia-infected cells in certain legume nodules, symbiosome can be considered an organelle-like 1 . Legume nodules are probably one of the most fascinating plant organs. They have been studied for more than a century, and microscopy techniques have been and will be key tools to enhance our understanding of this symbiosis. We will present examples of how microscopy techniques (light, fluorescence, laser confocal, TEM, LTSEM and X-Ray microanalysis, etc.) have been essential to elucidate different aspects of nodule development, structure and functioning, as well as its response to abiotic stress.
- Published
- 2018
29. Evaluación de la tolerancia al mercurio de dos variedades de altramuz, inoculadas con rizobios sensibles o tolerantes a este metal pesado, en suelos del Distrito Minero de Almadén
- Author
-
Quiñones, Miguel Angel, Fajardo, Susana, Rodríguez-Caviedes, Laura, Hortigüela, Claudia, Contreras, Miguel, Fernández-Pascual, Mercedes, Lucas, M. Mercedes, and Pueyo, José Javier
- Abstract
Trabajo presentado en el I Simposio Nacional del Mercurio, celebrado en Almadén (España), el 5 de julio de 2017, En nuestro grupo se está estudiando el potencial fitorremediador de suelos contaminados por metales pesados de la simbiosis leguminosa-rizobio. Se ha demostrado que la inoculación de plantas de altramuz (Lupinus albus) con la cepa L-7AH de Bradyrhizobium canariense tolerante al mercurio confiere a las plantas la capacidad de desarrollarse en presencia de este metal pesado y acumularlo en altas concentraciones. Esto se realizó utilizando vermiculita como soporte y concentraciones de HgCl2 entre 0 y 200 ¿M en la solución de riego. Crecimiento, eficiencia fotosintética y actividad nitrogenasa de las plantas inoculadas con L-7AH eran similares a los de las plantas control (sin Hg), mientras que en plantas inoculadas con la cepa L-3, sensible al Hg, todos los parámetros disminuían significativamente. Además, las inoculadas con L-7AH eran capaces de acumular altas concentraciones de Hg en sus raíces y nódulos (hasta 400 ¿g g-1) pero no en las hojas, mientras que con L-3 la acumulación era mucho menor. Estos resultados sugerían que la simbiosis L. albus-B. canariense L-7AH podría ser útil para la fitorremediación, mediante fitoestabilización, de suelos contaminados por mercurio. Para evaluar la capacidad fitorremediadora de estas plantas, se recogieron suelos de las localidades de Almadenejos y Las Cuevas con diferentes contenidos en Hg (22 y 2.6 g kg-1 de suelo, respectivamente). Los dos suelos se tamizaron y mezclaron con vermiculita (1:1) para evitar su compactación. Se sembraron semillas de altramuz de las variedades G1 y N1 y se inocularon con B. canariense L-7AH, o L-3, o no se inocularon. Tras 6 semanas de riego con agua estéril, todas las plantas mostraban un aspecto similar. Se midieron parámetros de crecimiento, fotosíntesis o actividades enzimáticas, sin encontrar diferencias significativas. El análisis físico-químico de los suelos, sin embargo, mostró que éstos presentaban una gran diferencia en su pH, siendo 6.9 el de Almadenejos y 5.1 el de Las Cuevas. Probablemente, dicha diferencia provoca que la concentración de Hg biodisponible sea muy similar, lo cual explicaría los resultados del presente ensayo.
- Published
- 2017
30. Response of legumes, rhizobia and their symbiosis to toxic heavy metals
- Author
-
Ministerio de Economía y Competitividad (España), Consejo Superior de Investigaciones Científicas (España), Lucas, M. Mercedes, Lara-Dampier, Victoria, Coba de la Peña, Teodoro, Fedorova, Elena E., Pallol, Beatriz, Fajardo, Susana, Quiñones, Miguel Angel, Fernández-Pascual, Mercedes, Pueyo, José Javier, Ministerio de Economía y Competitividad (España), Consejo Superior de Investigaciones Científicas (España), Lucas, M. Mercedes, Lara-Dampier, Victoria, Coba de la Peña, Teodoro, Fedorova, Elena E., Pallol, Beatriz, Fajardo, Susana, Quiñones, Miguel Angel, Fernández-Pascual, Mercedes, and Pueyo, José Javier
- Abstract
Pollution of soils with toxic heavy metals is increasing over the world due mainly to anthropogenic activities. Natural soils containing high levels of heavy metals also exist. In polluted soils, plant production for food and feed is a risk for human and animal health. To overcome this problem two strategies have been proposed: soil bioremediation with plants and their associated microorganisms, and culture of plants with low capability to translocate heavy metals to the edible parts. Legumes are promising candidates for these proposals; in fact, legumes inoculated with rhizobia isolated from heavy metal-polluted soils have been successfully used in polluted soils. Plants and microorganisms display mechanisms of response to toxic heavy metal stress, which included uptake, translocation and accumulation of the metal to avoid toxic effects of the metals. Structural and ultrastructural alterations of cells and tissues are also responses to heavy metals. In bacteria and plants upon heavy metal stress, common responses to another abiotic stresses (imbalance of the redox homeostasis, hormonal alteration, etc.) and more specific responses (transporters, detoxification by proteins and enzymes, etc.) can be found. Studies of transcriptomic, proteomic, metabolomic, ionomic, etc. are revealing new factors involved in these responses. These new approaches might help to draw the network of molecular, biochemical and physiological changes that allow the maintenance of the cellular homeostasis and the metabolic reprogramming. So far, the responses of legumes, rhizobia and their symbiosis to toxic heavy metals have not been extensively studied. A better knowledge of these responses will allow the selection of more tolerant rhizobialegume partners. We will present an overview of the responses of legumes and their microsymbionts to heavy metals, mainly focused on cadmium and mercury. We will present and discuss our results on Medicago, Lupinus, Ensifer and Bradyrhizobium and on their
- Published
- 2017
31. Tolerancia al mercurio de variedades de Lupinus albus inoculadas con Bradyrhizobium en suelos contaminados por mercurio
- Author
-
Ministerio de Economía y Competitividad (España), Consejo Superior de Investigaciones Científicas (España), Quiñones, Miguel Angel, Fajardo, Susana, Rodríguez-Caviedes, Laura, Hortigüela, Claudia, Contreras, Miguel, López-Berdonces, M. A., Esbrí, J. M., Higueras, Pablo, Coba de la Peña, Teodoro, Lucas, M. Mercedes, Pueyo, José Javier, Fernández-Pascual, Mercedes, Ministerio de Economía y Competitividad (España), Consejo Superior de Investigaciones Científicas (España), Quiñones, Miguel Angel, Fajardo, Susana, Rodríguez-Caviedes, Laura, Hortigüela, Claudia, Contreras, Miguel, López-Berdonces, M. A., Esbrí, J. M., Higueras, Pablo, Coba de la Peña, Teodoro, Lucas, M. Mercedes, Pueyo, José Javier, and Fernández-Pascual, Mercedes
- Abstract
En nuestro grupo se está estudiando el potencial fitorremediador de suelos contaminados por metales pesados de la simbiosis leguminosa-rizobio. Se ha demostrado, en cultivo semi-hidropónico y concentraciones entre 0 y 200 ¿M de HgCl2 en la solución de riego, que la inoculación de plantas de altramuz (L. albus) con la cepa L-7AH de Bradyrhizobium canariense, tolerante al mercurio, confiere a las plantas la capacidad de desarrollarse en presencia de este metal pesado y acumularlo en altas concentraciones, especialmente en raíces y nódulos. Crecimiento, eficiencia fotosintética y actividad nitrogenasa de las plantas inoculadas con L-7AH eran similares a los de las plantas control (sin Hg), mientras que en las inoculadas con la cepa sensible, L-3, todos los parámetros disminuían significativamente y apenas acumulaban Hg. Estos resultados sugerían que la simbiosis L. albus-B. canariense L-7AH podría ser útil para la fitorremediación, mediante fitoestabilización, de suelos contaminados por Hg. Para evaluar la capacidad fitorremediadora de estas plantas, se utilizaron suelos de las localidades de Almadenejos y Las Cuevas (Ciudad Real, España) con diferentes contenidos totales en Hg (22 y 2.6 g kg-1, respectivamente), que se mezclaron con vermiculita (1:1) para evitar su compactación. Se sembraron semillas de altramuz de las variedades G1 y N1 y se inocularon con B. canariense L-7AH, o L-3, o no se inocularon. Tras 6 semanas de riego con agua estéril, todas las plantas mostraban un aspecto similar. Se midieron parámetros de crecimiento, fotosíntesis, actividades enzimáticas del metabolismo antioxidante y nitrogenasa, sin encontrar diferencias significativas. El análisis físico-químico de los suelos, sin embargo, mostró que éstos presentaban una gran diferencia en su pH, siendo 6.9 el de Almadenejos y 5.1 el de Las Cuevas, lo cual afecta al porcentaje de Hg ligado a ácidos húmicos que es del 2.1% y del 13.1%, respectivamente. En esas condiciones, la concentración de Hg biodi
- Published
- 2017
32. Desarrollo de binomios microorganismo-planta para su uso en la recuperación de suelos degradados
- Author
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Coba de la Peña, Teodoro, García de la Torre, Vanesa S., Ruiz Díez, Beatriz, Quiñones, Miguel Angel, Santamaría Pérez, Blanca, Rincón, Ana, Fernández-Pascual, Mercedes, Pueyo, José Javier, and Lucas, M. Mercedes
- Abstract
Trabajo presentado en la III Reunión Científica del Programa Microambiente de la Comunidad de Madrid, celebrada en Madrid (España), el 13 de diciembre de 2013, La simbiosis entre plantas y bacterias u hongos ectomicorrícicos puede favorecer la recuperación de suelos degradados. La selección de microorganismos y plantas tolerantes a estreses abióticos (salinidad, sequía, metales pesados, etc.) permitirá la obtención de sistemas simbióticos más eficientes. Nuestra investigación se ha centrado fundamentalmente en la simbiosis rizobioleguminosa, para su utilización en la fitorremediación de suelos contaminados por metales pesados. A partir de una colección de cepas de rizobios aisladas de suelos del distrito minero de Almadén, hemos seleccionado una cepa de Bradyrhizobium canariense por su resistencia a Hg y su capacidad de nodular plantas de Lupinus albus. Hemos demostrado que la inoculación de altramuz con esta cepa confiere a las plantas ventajas que permiten su crecimiento en presencia de Hg, mientras que plantas inoculadas con una cepa sensible se ven afectadas. En el mismo sentido, una cepa de Ensifer meliloti, obtenida en nuestro laboratorio, que sobreexpresa la proteína antioxidante flavodoxina presenta mayor tolerancia a estrés por Cd y al estrés oxidativo inducido por los herbicidas paraquat y atrazina. La inoculación de Medicago sativa con este rizobio produjo una mejora de la simbiosis en condiciones de estrés por Cd y por sal. Estos resultados sugieren que el uso de inoculantes con rizobios tolerantes a un estrés determinado favorece la tolerancia de la simbiosis a dicho estrés y por tanto sería recomendable para la recuperación de suelos marginales. También hemos desarrollado y validado un método rápido de “screening” y detección de variedades de M. truncatula tolerantes a metales pesados que ha permitido identificar cultivares sensibles y cultivares altamente tolerantes. Un mejor conocimiento de los mecanismos de respuesta y tolerancia a los metales pesados contribuirá a la selección de leguminosas y rizobios más tolerantes. Por ello, hemos comparado variedades tolerantes y sensibles de M. truncatula, observando diferencias en los patrones nutricionales, actividad amilasa y peroxidación lipídica que podrían estar relacionados con mecanismos de tolerancia. Por otra parte, en bacterias y plantas noduladas de M. truncatula, estamos caracterizando la enzima aldehído oxidasa (AO) que cataliza la última reacción en la síntesis de IAA y ABA, tiene un papel clave en el desarrollo y fisiología de la planta y en su adaptación a estreses. Los resultados sugieren que el estrés por Cd altera la expresión y la actividad AO de la planta y del bacteroide. Además, hemos comprobado que dicho estrés tiene un efecto a nivel de compartimentación iónica y de expresión de genes de transportadores iónicos en nódulos. Los resultados sugieren que el Cd afecta el balance Na+ /K+ de las células del nódulo y de los simbiosomas. Finalmente, en cuanto a la simbiosis ectomicorrícica, hemos comprobado que la inoculación de Pinus pinaster con un hongo seleccionado por su adaptación a condiciones post-incendio (Rhizopogon luteolus) o con una bacteria PGPR (Pseudomonas fluorescens) favorece el desarrollo de las plantas y su respuesta a estrés por sequía. La co-inoculación con ambos microorganismos induce un efecto sinérgico en el crecimiento y la ontogenia de las plantas. En conjunto, todos estos resultados revelan el alto potencial de aplicación de binomios microorganismo simbionte-planta para la recuperación de suelos degradados.
- Published
- 2013
33. The future of lupin as a protein crop in Europe
- Author
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Ministerio de Economía y Competitividad (España), Lucas, M. Mercedes, Stoddard, F., Annicchiarico, P., Frías, Juana, Martínez-Villaluenga, Cristina, Sussmann. D., Duranti, M., Seger, A., Zander, P. M., Pueyo, José Javier, Ministerio de Economía y Competitividad (España), Lucas, M. Mercedes, Stoddard, F., Annicchiarico, P., Frías, Juana, Martínez-Villaluenga, Cristina, Sussmann. D., Duranti, M., Seger, A., Zander, P. M., and Pueyo, José Javier
- Abstract
© 2015 Lucas, Stoddard, Annicchiarico, Frías, Martínez-Villaluenga, Sussmann, Duranti, Seger, Zander and Pueyo. Europe has become heavily dependent on soya bean imports, entailing trade agreements and quality standards that do not satisfy the European citizen’s expectations. White, yellow, and narrow-leafed lupins are native European legumes that can become true alternatives to soya bean, given their elevated and high-quality protein content, potential health benefits, suitability for sustainable production, and acceptability to consumers. Nevertheless, lupin cultivation in Europe remains largely insufficient to guarantee a steady supply to the food industry, which in turn must innovate to produce attractive lupin-based protein-rich foods. Here, we address different aspects of the food supply chain that should be considered for lupin exploitation as a high-value protein source. Advanced breeding techniques are needed to provide new lupin varieties for socio-economically and environmentally sustainable cultivation. Novel processes should be optimized to obtain high-quality safe lupin protein ingredients, and marketable foods need to be developed and offered to consumers. With such an integrated strategy, lupins can be established as an alternative protein crop, capable of promoting socio-economic growth and environmental benefits in Europe.
- Published
- 2015
34. Estudios sobre biodiversidad de bacterias asociadas a leguminosas y de hongos ectomicorrícicos en suelos degradados
- Author
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Ruiz Díez, Beatriz, Nonnoi, Francesca, Cordero, Irene, Coba de la Peña, Teodoro, García de la Torre, Vanesa S., Santamaría Pérez, Blanca, Aguado, Lourdes, Quiñones, Miguel Angel, Lucas, M. Mercedes, Rincón, Ana, Pueyo, José Javier, and Fernández-Pascual, Mercedes
- Abstract
Trabajo presentado en la III Reunión Científica del Programa Microambiente de la Comunidad de Madrid, celebrada en Madrid (España), el 13 de diciembre de 2013, La aplicación de simbiosis planta-microorganismo es una herramienta con alto potencial para la recuperación de suelos degradados, por lo que resulta de gran interés el estudio de la diversidad de microorganismos simbiontes autóctonos. Nuestro grupo ha realizado este tipo de estudios en suelos agrícolas y forestales en España, Cuba y Perú. Se han aislado rizobios del norte de Madrid, capaces de nodular leguminosas arbustivas como Retama, Cytisus, Spartium y Adenocarpus, que se adscriben a Bradyrhizobium canariense, Phylobacterium myrsinacearum, Rhizobium rhizogenes y Mesorhizobium huakuii y que han mostrado ser muy resistentes a estreses abióticos (sal, pH, Tª y Cd). En 4 zonas de Castilla-La Mancha y a partir de 15 leguminosas de interés agronómico, hemos aislado 36 cepas de rizobio, que mostraron gran homogeneidad fenotípica y genotípica, predominando la especie R. leguminosarum; el análisis de su eficiencia simbiótica, ha permitido la selección de cepas para su empleo como inoculantes. Con el objetivo de emplear la simbiosis Rhizobium-leguminosa para fitorremediar suelos de Almadén (Castilla-La Mancha), afectados por la contaminación por Hg, se han aislado 79 rizobios de 15 especies de leguminosas (Vicia sativa, Trifolium sp., Medicago sp., Phaseolus vulgaris, Lupinus albus y R. sphaerocarpa) de 7 áreas con diferente contaminación por Hg, que se caracterizaron genotípica y fenotípicamente. La variabilidad a nivel de especie comprendió R. leguminosarum, Ensifer medicae, B. canariense y R. radiobacter, y una cepa que permitió la descripción de la nueva especie Bradyrhizobium. retamae. Algunas cepas fueron tolerantes a varios metales y la tolerancia a Hg se ha relacionado con la zona de origen. Se han obtenido rizobios de Vigna unguiculata y P. vulgaris en 2 suelos salinos de Cuba que se adscribieron a B. lianoningense, B. yuanmingense, R. radiobacter, E. fredii y E. terengae. La inoculación de Vigna con dos de las cepas, originó una producción similar a los tratamientos con fertilización nitrogenada. También se ha aislado más de 200 bacterias de la rizosfera de Caesalpinia spinosa (tara) y de nódulos de Acacia macracantha, leguminosas del bosque de nieblas de Perú. Por primera vez se ha demostrado la nodulación de esta acacia, identificándose cepas de E. meliloti, E. americanum, E. saheli, R. leguminosarum, Rhizobium sp. Algunas cepas presentaron características PGPRs y/o capacidad para proteger a la tara frente al estrés hídrico, lo que las convierte en inoculantes potenciales para la restauración de este bosque. Finalmente, se han caracterizado comunidades de hongos ectomicorrícicos asociados a plantas de interés forestal como Pinus sylvestris y P. pinaster en un gradiente altitudinal y en suelos incendiados. La respuesta de estas comunidades a distintos estreses, ha revelado especies potencialmente adaptadas a condiciones ambientales concretas, como Rhizopogon luteolus, que han sido utilizadas para reforestación en suelos quemados.
- Published
- 2013
35. La vida secreta de las plantas: relaciones sorprendentes con los microorganismos del suelo
- Author
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Fernández-Pascual, Mercedes, Pueyo, José Javier, Quiñones, Miguel Angel, Coba de la Peña, Teodoro, Ruiz Díez, Beatriz, Flores-Rentería, Dulce, Gómez Gallego, T., and Rincón, Ana
- Abstract
Las plantas y los microorganismos interaccionan aportándose beneficio mutuo, lo cual puede ser aplicado para la conservación del medioambiente.
- Published
- 2013
36. Effects of salt stress and rhizobial inoculation on growth and nitrogen fixation of three peanut cultivars
- Author
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EL-Akhl, M. Rabie, Rincón, Ana, Coba de la Peña, Teodoro, Lucas, M. Mercedes, El-Mourabit, Nourdin, Barrijal, Said, and Pueyo, José Javier
- Subjects
Salinity ,Inoculation ,Peanut ,Arachis hypogaea ,fungi ,Salt stress ,food and beverages ,Rhizobium - Abstract
7 páginas, 3 figuras y 2 tablas estadísticas, Increasing soil salinity represents a major constraint for agriculture in arid and semi-arid lands, where mineral nitrogen (N) deficiency is also a frequent characteristic of soils. Biological N fixation by legumes may constitute a sustainable alternative to chemical fertilisation in salinity-affected areas, provided that adapted cultivars and inoculants are available. Here, the performance of three peanut cultivars nodulated with two different rhizobial strains that differ in their salt tolerance was evaluated under moderately saline water irrigation and compared with that of N-fertilised plants. Shoot weight was used as an indicator of yield. Under non-saline conditions, higher yields were obtained using N fertilisation rather than inoculation for all the varieties tested. However, under salt stress, the yield of inoculated plants became comparable to that of N-fertilised plants, with minor differences depending on the peanut cultivar and rhizobial strain. Our results indicate that N fixation might represent an economical, competitive and environmentally friendly choice with respect to mineral N fertilisation for peanut cultivation under moderate saline conditions.
- Published
- 2013
37. Utilización de la simbiosis Rhizobium-leguminosa en la recuperación de suelos marginales: aproximaciones biotecnológicas
- Author
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Coba de la Peña, Teodoro, Ruiz Díez, Beatriz, García de la Torre, Vanesa S., Nonnoi, Francesca, Lucas, M. Mercedes, Fernández-Pascual, Mercedes, Quiñones, Miguel Angel, Rincón, Ana, Pueyo, José Javier, Ministerio de Ciencia e Innovación (España), Comunidad de Madrid, Junta de Comunidades de Castilla-La Mancha, Ministerio de Educación, Cultura y Deporte (España), Fundación Ramón Areces, Ministerio de Asuntos Exteriores y Cooperación (España), and Consejo Superior de Investigaciones Científicas (España)
- Abstract
Trabajo presentado en las IV Jornadas de la Asociación Española de Leguminosas. V Seminario de la Judía, celebradas en Pontevedra (España), en julio de 2012
- Published
- 2012
38. Costs and benefits of structural photoprotection in a neotropical legume tree (Caesalpinia spinosa (Mol.) Kuntze)
- Author
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Cordero, Irene, Jiménez, M.D., Delgado, J.A., Rincón, Ana, López Valero, Manuela, Santamaría Pérez, Blanca, Pueyo, José Javier, Balaguer, L., CSIC - Instituto de Ciencias Agrarias (ICA), and Universidad Complutense de Madrid
- Subjects
Caesalpinia spinosa ,Photoprotection ,Semiarid shrub-lands ,Climate change ,Stressful environments - Abstract
Resumen de la comunicación presentada en el congreso que se cita- Cartel del congreso y resumen, Photoprotection is a crucial ability that allows plants to live under stressful environments. Plants develop structural and chemical mechanisms of photoprotection to preserve their photosystems from light excess. We studied the photo-protective strategy and its physiological consequences in tara (Caesalpinia spinosa), a legume tree endemic of South America, showing the adaptative trait of closing leaflets under stressful conditions. Tara has a significant ecological and economic value thriving in many different ecosystems from semiarid shrub-lands to agricultural areas and dry or fog forests., Asociación Española de Ecología Terrestre (AEET) - Sociedade Portuguesa de Ecologia (SPECO)
- Published
- 2011
39. Nitrogen fixation persists under conditions of salt stress in transgenic Medicago truncatula plants expressing a cyanobacterial flavodoxin
- Author
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Coba de la Peña, Teodoro, Redondo, F. J., Manrique, Esteban, Lucas, M. Mercedes, and Pueyo, José Javier
- Subjects
Nitrogen fixation ,Medicago truncatula ,Salt stress ,Flavodoxin ,Nodule ,Symbiosis - Abstract
12 pages, figures, and tables statistics., Several recent studies have demonstrated that the expression of a cyanobacterial flavodoxin in plants can provide tolerance to a wide range of environmental stresses. Indeed, this strategy has been proposed as a potentially powerful biotechnological tool to generate multiple-tolerant crops. To determine whether flavodoxin expression specifically increased tolerance to salt stress and whether it might also preserve legume nitrogen fixation under saline conditions, the flavodoxin gene was introduced into the model legume Medicago truncatula. Expression of flavodoxin did not confer saline tolerance to the whole plant, although the sensitive nitrogen-fixing activity was maintained under salt stress in flavodoxin-expressing plants. Our results indicate that flavodoxin induced small but significant changes in the enzymatic activities involved in the nodule redox balance that might be responsible for the positive effect on nitrogen fixation. Expression of flavodoxin can be regarded as a potential tool to improve legume symbiotic performance under salt stress, and possibly other environmental stresses., This work was supported by the Comunidad de Madrid (postdoctoral contract to T.C.P., and grants to M.M.L. and J.J.P.), the Consejo Superior de Investigaciones Cientı´ficas (CSIC) and the European Social Fund (postdoctoral contract to T.C.P. and a fellowship to F.J.R.), the Spanish Ministry of Education and Science, Fundacio´ n Areces and Junta de Comunidades de Castilla-La Mancha (grants to J.J.P.). The authors thank Dr. N. Carrillo for the kind gift of the pFLX plasmid.
- Published
- 2010
40. Identificación de rizobacterias de suelos de Perú y España para su aplicación en la restauración del bosque de nieblas de Atiquipa y en la fitorremediación de suelos contaminados por mercurio en Almadén
- Author
-
Cordero, Irene, Nonnoi, Francesca, Coba de la Peña, Teodoro, Rincón, Ana, Ruiz Díez, Beatriz, Fajardo, Susana, Balaguer, Luis, Fernández-Pascual, Mercedes, Pueyo, José Javier, and Lucas, M. Mercedes
- Abstract
Trabajo presentado en la II Reunión Programa Microambiente de la Comunidad de Madrid, celebrada en Madrid (España), del 30 de septiembre al 1 de octubre de 2010
- Published
- 2010
41. Genetic basis for denitrification in Ensifer meliloti
- Author
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European Commission, Ministerio de Economía y Competitividad (España), Comunidad de Madrid, Junta de Andalucía, Consejo Superior de Investigaciones Científicas (España), Torres Porras, María Jesús, Rubia, María I., Coba de la Peña, Teodoro, Pueyo, José Javier, Bedmar, Eulogio J., Delgado Igeño, María Jesús, European Commission, Ministerio de Economía y Competitividad (España), Comunidad de Madrid, Junta de Andalucía, Consejo Superior de Investigaciones Científicas (España), Torres Porras, María Jesús, Rubia, María I., Coba de la Peña, Teodoro, Pueyo, José Javier, Bedmar, Eulogio J., and Delgado Igeño, María Jesús
- Abstract
[Background] Denitrification is defined as the dissimilatory reduction of nitrate or nitrite to nitric oxide (NO), nitrous oxide (N2O), or dinitrogen gas (N2). N2O is a powerful atmospheric greenhouse gas and cause of ozone layer depletion. Legume crops might contribute to N2O production by providing nitrogen-rich residues for decomposition or by associating with rhizobia that are able to denitrify under free-living and symbiotic conditions. However, there are limited direct empirical data concerning N2O production by endosymbiotic bacteria associated with legume crops. Analysis of the Ensifer meliloti 1021 genome sequence revealed the presence of the napEFDABC, nirK, norECBQD and nosRZDFYLX denitrification genes. It was recently reported that this bacterium is able to grow using nitrate respiration when cells are incubated with an initial O2 concentration of 2%; however, these cells were unable to use nitrate respiration when initially incubated anoxically. The involvement of the nap, nirK, nor and nos genes in E. meliloti denitrification has not been reported., [Results] E. meliloti nap, nirK and norC mutant strains exhibited defects in their ability to grow using nitrate as a respiratory substrate. However, E meliloti nosZ was not essential for growth under these conditions. The E. meliloti napA, nirK, norC and nosZ genes encode corresponding nitrate, nitrite, nitric oxide and nitrous oxide reductases, respectively. The NorC component of the E. meliloti nitric oxide reductase has been identified as a c-type cytochrome that is 16 kDa in size. Herein, we also show that maximal expression of the E. meliloti napA, nirK, norC and nosZ genes occurred when cells were initially incubated anoxically with nitrate., [Conclusion] The E. meliloti napA, nirK, norC and nosZ genes are involved in nitrate respiration and in the expression of denitrification enzymes in this bacterium. Our findings expand the short list of rhizobia for which denitrification gene function has been demonstrated. The inability of E. meliloti to grow when cells are initially subjected to anoxic conditions is not attributable to defects in the expression of the napA, nirK, norC and nosZ denitrification genes.
- Published
- 2014
42. Phenotypic and genotypic characterizations of rhizobia isolated from root nodules of peanut (Arachis hypogaea L.) grown in Moroccan soils
- Author
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El-Akhal, M. Rabie, Rincón, Ana, El Mourabit, Nourdin, Pueyo, José Javier, and Barrijal, Said
- Subjects
Peanut ,Arachis hypogaea ,food and beverages ,Bradyrhizobium ,Rhizobium - Abstract
The phenotypic and genotypic characterization of sixty-two rhizobial isolates obtained from nodules of Arachis hypogaea in north-western Morocco was performed. Their physiological and biochemical properties revealed a great deal of diversity among them. Isolates were classified into two major groups based on the numerical analysis of their phenotypic and genotypic characteristics. Isolates in the first group were alkali- and salt-sensitive, slow or extra-slow growers; they did not use disaccharides as carbon source and varied in the use of amino acids. ARDRA analysis of the 16S rDNA region grouped them together with reference strains belonging to the genus Bradyrhizobium. In the second group, isolates were fast growers, acidsensitive, and alkali- and salt-tolerant; they used both mono and disaccharides as carbon sources, and methionine was the only amino acid they could metabolize as a nitrogen source. ARDRA analysis grouped them with fast-growing reference strains. Both groups exhibited a range of variability in tolerance to heavy metals. The Intergenic Spacer (IGS)-PCR fingerprinting analysis confirmed a high genotypic diversity at the strain level. This characterization provides a basis for the selection of peanut-nodulating rhizobia which may have applications in formulating appropriate inocula for improving peanut crop yield on Moroccan soils, including saline and acidic marginal areas.
- Published
- 2009
43. Comunidad de hongos ectomicorrícicos asociada al regenerado de Pinus pinaster Ait. tras el incendio de el Rodenal (Guadalajara). Montés y sociedad. saber qué hacer.Ávila 21 a 25 de septiembre de 2009
- Author
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Rincón, Ana, Pueyo, José Javier, Vega Hidalgo, J. A., Carrillo Patiño, A., and Ocaña Bueno, L.
- Subjects
Regeneración natural ,Ectomicorrizas ,Restauración de incendios ,Pinus pinaster ,Severidad - Abstract
11 pages, figures, and tables statistics., En julio de 2005, se produjo un gran incendio en El Rodenal (Guadalajara) que afectó a más de 10.000 ha de pino rodeno. Ese mismo año, la empresa TRAGSA emprendió el proyecto de I+D “RODENAL” orientado a estudiar los procesos de regeneración natural postincendio y el efecto de ciertas prácticas selvícolas en relación con los mismos. Dentro de este proyecto, una de las líneas de trabajo fue la caracterización de la comunidad de hongos ectomicorrícicos (EM) asociada al regenerado de pino rodeno uno y dos años después del incendio. En esta aportación, se presentan los resultados relacionados con la diversidad, la frecuencia y abundancia de hongos EM asociados al regenerado de P. pinaster, así como su distribución en función de la severidad del incendio, la pendiente de la parcela y la fecha de muestreo.
- Published
- 2009
44. Diversidad bacteriana en la rizosfera de tara (Caesalpinia spinosa) en los bosques de Lomas de Atiquipa (Perú)
- Author
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Cordero, Irene, Coba de la Peña, Teodoro, Rincón, Ana, Villegas, Luis, Ruiz Díez, Beatriz, Fajardo, Susana, Morcillo, César N., Lucas, M. Mercedes, Fernández-Pascual, Mercedes, Manrique, Esteban, Jiménez, P., Balaguer, Luis, and Pueyo, José Javier
- Abstract
Trabajo presentado en el I Congreso Luso-Espanhol de Fixacao de Azoto. XII Reunión Nacional de la Sociedad Española de Fijación de Nitrógeno, celebrado en Estoril (Portugal), del 1 al 4 de junio de 2008
- Published
- 2008
45. Characterization of Bradyrhizobia isolated from root nodules of Cytisus Triflorus in the rif occidental of Morocco
- Author
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Chahboune, R., El-Akhal, M. Rabie, Arakrak, A., Bakkali, M., Laglaoui, A., Pueyo, José Javier, and Barrijal, Said
- Subjects
Cytisus Triflorus ,Bradyrhizobia ,Rif Occidental of Morocco - Abstract
2 pages., Over the last 3 decades, soil in the North of Morocco has been heavily degraded as a result of human activities, In the north of Morocco, particularly the Riff occidental, there is a strong anthropozoogenic pressure, through the practice of clearing the land to profit from the extension of Cannabis culture and an increase in the frequency of forest fires. These factors threaten the survival of the shrubby legume in its ecological niche.
- Published
- 2008
46. Overexpression of flavodoxin in alfalfa nodules leads to delayed senescence and high starch accumulation
- Author
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Coba de la Peña, Teodoro, Redondo, F. J., Lucas, M. Mercedes, and Pueyo, José Javier
- Subjects
Alfalfa ,Flavodoxin - Abstract
2 páginas, Nodule senescence is the sequence of structural, molecular, biochemical and physiological events leading to the loss of the nitrogen-fixing activity and to cell death in the symbiotic tissue.
- Published
- 2008
47. Water stress responses of two Mediterranean tree species influenced
- Author
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Rincón, Ana, Valladares Ros, Fernando, Gimeno, Teresa E., and Pueyo, José Javier
- Subjects
plant growth promoting rhizobacteria ,fungi ,food and beverages ,Pinus halepensis ,rhizosphere microorganisms ,Quercus coccifera ,water deficit - Abstract
9 p., 6 fig., 2 tabl., Soil microorganisms, such as plant growth-promoting rhizobacteria (PGPR), play crucial roles in plant growth, but their influence on plant water relations remains poorly explored.We studied the effects of native soil microorganisms and inoculation with the PGPR strain Aur6 of Pseudomonas fluorescens onwater stress responses of seedlings of the drought-avoiding Pinus halepensis Mill. and the drought-tolerant Quercus coccifera L. Plant growth, nutrient concentrations and physiology (maximum photochemical efficiency of photosystem II (PSII; Fv /Fm), electron transport rate (ETR), stomatal conductance (gs) and predawn shoot water potential (ΨPD)) were measured in well-watered plants, and in plants under moderate or severe water stress. Inoculation with PGPR and native soil microorganisms improved tree growth, and their interactions had either additive or synergistic effects. Both Fv/Fm and ETR were significantly affected by PGPR and native soil microorganisms. Marked differences in gs and ΨPD were found between species, confirming that they differ in mechanisms of response to water stress. A complex tree species × treatment interactive response to drought was observed. In P. halepensis, Fv/Fm and ETR were enhanced by PGPR and native soil microorganisms under well-watered conditions, but the effects of PGPR on ΨPD and gs were negative during a period ofwater stress. InQ. coccifera, Fv/Fm and ETR were unaffected or even reduced by inoculation under well-watered conditions, whereas ΨPD and gs were increased by PGPR during a period of water stress. Our results indicate that microbial associates of roots can significantly influence the response of tree seedlings to drought, but the magnitude and sign of this effect seems to depend on the water-use strategy of the species, GR/AMB/0735/2004 and S-0505/ AMB/0321
- Published
- 2008
48. Aislamiento y caracterización de bacterias de la rizosfera de Tara
- Author
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Coba de la Peña, Teodoro, Rincón, Ana, Villegas, Luis, Ruiz Díez, Beatriz, Fajardo, Susana, Lucas, M. Mercedes, Fernández-Pascual, Mercedes, Manrique, Esteban, Balaguer, Luis, and Pueyo, José Javier
- Abstract
Trabajo presentado en el IV Congreso Peruano de Ecología (COPE), celebredo en Arequipa (Perú), del 18 al 22 de noviembre de 2007
- Published
- 2007
49. Selección de microorganismos para su aplicación en programas de restauración de suelos
- Author
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Rincón, Ana, Fernández-Pascual, Mercedes, Felipe, Mª Rosario de, Lucas, M. Mercedes, and Pueyo, José Javier
- Abstract
Trabajo presentado en la I Reunión del Consorcio de Microambiente de la Comunidad de Madrid, celebrada en Madrid (España), en abril de 2007
- Published
- 2007
50. Singular Features of the Bradyrhizobium-Lupinus Symbiosis
- Author
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Fernández-Pascual, Mercedes, Pueyo, José Javier, Felipe, Mª Rosario de, Golvano, Maria Pilar, and Lucas, M. Mercedes
- Subjects
MAPKinases ,food and beverages ,Oxygen-diffusion-barrier ,Nodule-senescence ,Aldehyde oxidase ,Abiotic-stress-tolerance ,Root-infection - Abstract
Lupinus is a legume with great agronomic potential due to the high protein content of its seeds and its positive effect on soil fertility. It is able to fix atmospheric nitrogen through the establishment of a symbiosis with soil bacteria of the genus Bradyrhizobium. The process is carried out in a special subclass of indeterminate nodules known as lupinoid nodules. The Bradyrhizobium-Lupinus symbiosis has particular characteristics, which makes it different from other Rhizobium-legume symbioses. The entry of the bacteria into the plant root occurs at the junction between the root hair base and the adjacent epidermic cell and only sporadic “infection threads” have been observed. The involvement of mitogen-activated protein kinases (MAPKs) and aldehyde oxidase in infection and nodule morphogenesis have been reported for the first time in this symbiosis. The presence of nitric oxide synthase activity in plants has been detected for the first time, in roots and nodules of Lupinus albus. The unique lupin nodule cortical structure has contributed to the visualization and elucidation of the operational mechanisms of the oxygen diffusion barrier. Nodule senescence takes place in a similar way to that of determinate nodules, starting in the central area of the nodule. This symbiosis is especially resistant to abiotic stresses such as herbicides, nitrate, salinity and heavy metals. This unusual tolerance has permitted the use of inoculated lupin plants for the re-vegetation of degraded areas and as a pioneer plant to fight soil erosion and to reclaim eroded soils. The capability to accumulate Cd, Zn and others heavy metals in the nodulated roots has resulted in the consideration of this symbiosis as a potential phytoremediator, This work was supported by the Ministerio de Educación y Ciencia, Comunidades of Castilla- La Mancha and Madrid and Fundación BBVA
- Published
- 2007
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