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9. Enhancing quinoa (Chenopodium quinoa) growth in saline environments through salt‐tolerant rhizobacteria from halophyte biotope.

Author

Slatni, Tarek, Ben Slimene, Imen, Harzalli, Zina, Taamalli, Wael, Smaoui, Abderrazak, Abdelly, Chedly, and Elkahoui, Salem

Subjects
SUSTAINABLE agriculture, SOIL salinity, PRINCIPAL components analysis, BACILLUS thuringiensis, BIOMASS production, HALOPHYTES, QUINOA
Abstract

The use of plant growth‐promoting rhizobacteria (PGPR) in agriculture is one of the most promising approaches to improve plants' growth under salt stress and to support sustainable agriculture under climate change. In this context, our goal was to grow and enhance quinoa growth using native rhizobacteria that can withstand salt stress. To achieve this objective, we isolated rhizobacteria from three saline localities in a semi‐arid region in Tunisia, which are characterized by different halophyte species and tested their plant growth‐promoting (PGP) activities. Then, we inoculated quinoa seedlings cultivated on 300 mM NaCl with the three most efficient rhizobacteria. A positive effect of the three‐salt tolerant rhizobacteria on the growth of quinoa under salinity was observed. In fact, the results of principal component analysis indicated that the inoculation of quinoa by salt‐tolerant PGPR under high salinity had a prominent beneficial effect on various growth and physiological parameters of stressed plant, such as the biomass production, the roots length, the secondary roots number, proline content and photosynthesis activities. Three rhizobacteria were utilized in this investigation, and the molecular identification revealed that strain 1 is related to the Bacillus inaquosorum species, strain 2 to Bacillus thuringiensis species and strain 3 to Bacillus proteolyticus species. We can conclude that the saline soil, especially the halophytic rhizosphere, is a potential source of salt‐tolerant plant growth‐promoting rhizobacteria (ST‐PGPR), which stimulate the growth of quinoa and improve its tolerance to salinity. [ABSTRACT FROM AUTHOR]

Published
2024
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22. Paper Industry Effluent Short and Long Effect on Soil Heavy Metals Accumulation and Phytoremediation

Author

Ltifi, Abdelkader, Saidi, Neila, Rabhi, Mokded, Downer, James, Smaoui, Abderrazak, Abdellly, Chedly, Hafiane, Amor, Abdalla, Hassan, Series editor, Abdul Mannan, Md., Series editor, Alalouch, Chaham, Series editor, Attia, Sahar, Series editor, Boemi, Sofia Natalia, Series editor, Bougdah, Hocine, Series editor, Bozonnet, Emmanuel, Series editor, De Bonis, Luciano, Series editor, Hawkes, Dean, Series editor, Kostopoulou, Stella, Series editor, Mahgoub, Yasser, Series editor, Mesbah Elkaffas, Saleh, Series editor, Mohareb, Nabil, Series editor, O. Gawad, Iman, Series editor, Oostra, Mieke, Series editor, Pignatta, Gloria, Series editor, Pisello, Anna Laura, Series editor, Rosso, Federica, Series editor, Kallel, Amjad, editor, Ksibi, Mohamed, editor, Ben Dhia, Hamed, editor, and Khélifi, Nabil, editor

Published
2018
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25. Silicon Reduces Cadmium Accumulation and Improves Growth and Stomatal Traits in Sea Barley (Hordeum marinumHuds.) Exposed to Cadmium Stress

Author

Rhimi, Nassira, Hajji, Mounir, Elkhouni, Amine, Ksiaa, Mariem, Rabhi, Mokded, Lefi, Elkadri, Smaoui, Abderrazak, Hessini, Kamel, Hamzaoui, Ahmed Hichem, Cabassa-Hourton, Cécile, Savouré, Arnould, Debez, Ahmed, Zorrig, Walid, and Abdelly, Chedly

Abstract

Silicon (Si) is not deemed sensu stricto as an essential nutrient for higher plants, but it is known for its positive impact under environmental stress conditions. The present study hypothesizes that the addition of silicon (Si) could alleviate cadmium (Cd) toxicity and reduce its accumulation in sea barley. Twenty-day-old plants were hydroponically grown under controlled conditions at two Cd levels (0 and 25 µM) with (1 mM) or without Si supply. Several aspects of the plant morphology, photosynthetic activity, membrane stability, and the status of metals (Cd, Zn, and Fe) were assessed after 17 days. Statistical analyses (Duncan’s test p≤ 0.05) indicated that most studied parameters were altered by metal treatment, reflecting Cd toxicity. Plant growth, water status, carotenoid content, chlorophyll (Chl. a/Chl. b) ratio, carotenoid/(Chl. a+ Chl. b) ratio, gas exchanges, fluorescence parameters (ETR, qP, and NPQ), membrane stability, and Zn concentration in both roots and shoots were significantly impacted by Cd. However, plants simultaneously treated with Cd and Si supply showed a significant restoration in growth parameters, water content, and photosynthetic pigments. The mitigating effect of Si was associated with higher stomatal conductance, transpiration, chlorophyll fluorescence (ETR, qP, and NPQ) values, and better membrane stability. The attenuation of Cd’s toxic effect was also explained by the fact that Si prevented Cd uptake, as Si decreased Cd content in shoot and root tissues. The current study revealed that silicon supply to sea barley, grown under Cd stress, mitigates Cd toxicity and leads the way forward for similar studies on other cereal field crops.

Published
2024
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30. Seasonal Changes in the Plant Growth-Inhibitory Effects of Rosemary Leaves on Lettuce Seedlings

Author

Appiah, Kwame S., Omari, Richard Ansong, Onwona-Agyeman, Siaw, Amoatey, Christiana Adukwei, Ofosu-Anim, John, Smaoui, Abderrazak, Ben Arfa, Abdelkarim, Suzuki, Yoko, Oikawa, Yosei, Okazaki, Shin, Katsura, Keisuke, Isoda, Hiroko, Kawada, Kiyokazu, Fujii, Yoshiharu, Appiah, Kwame S., Omari, Richard Ansong, Onwona-Agyeman, Siaw, Amoatey, Christiana Adukwei, Ofosu-Anim, John, Smaoui, Abderrazak, Ben Arfa, Abdelkarim, Suzuki, Yoko, Oikawa, Yosei, Okazaki, Shin, Katsura, Keisuke, Isoda, Hiroko, Kawada, Kiyokazu, and Fujii, Yoshiharu

Abstract

Plant biodiversity has been studied to explore allelopathic species for the sustainable management of weeds to reduce the reliance on synthetic herbicides. Rosemary (Rosmarinus officinalis L., syn Salvia rosmarinus Spenn.), was found to have plant growth-inhibitory effects, and carnosic acid was reported as an allelochemical in the plant. In this study, the effects of seasonal variation (2011–2012) on the carnosic acid concentration and phytotoxicity of rosemary leaves from two locations in Tunisia (Fahs and Matmata) were investigated. The carnosic acid concentration in rosemary leaves was determined by HPLC, and lettuce (Lactuca sativa L.) was used as the receptor plant in the phytotoxicity bioassay. The highest carnosic acid concentration was found in rosemary samples collected in June 2011, which also had the highest inhibitory activity. Furthermore, a significant inverse correlation (r = −0.529; p < 0.01) was found between the inhibitory activity on lettuce hypocotyl and the carnosic acid concentration in rosemary leaves. Both temperature and elevation had a significant positive correlation with carnosic acid concentration, while rainfall showed a negative correlation. The results showed that the inhibitory effects of rosemary leaf samples collected in summer was highest due to their high carnosic acid concentration. The phytotoxicity of rosemary needs to be studied over time to determine if it varies by season under field conditions., Peer Reviewed

Published
2022

31. Silicon (Si) Treatment has Preferential Beneficial Effects on Photosystem I Photochemistry in Salt-Treated Hordeum marinum(Huds.) Plants

Author

Laifa, Israa, Ellouzi, Hasna, Idoudi, Mariem, Farhat, Nèjia, Rabhi, Mokded, Mahmoudi, Henda, Smaoui, Abderrazak, Debez, Ahmed, Cabassa-Hourton, Cécile, Savouré, Arnould, Abdelly, Chedly, and Zorrig, Walid

Abstract

Silicon (Si) is the second most abundant element in the Earth’s crust, after oxygen. Although not consistently considered an essential nutrient for plant growth, its positive impact on crop development and production, particularly under stressful conditions such as salt stress, has been well documented. This study aimed to examine the separate and combined effects of salt stress and silicon supply on sea barley (Hordeum marinumHuds.) plants. Thirty-six-day-old H. marinumplants were grown either without or with 150 mM NaCl in the absence or presence of Na2SiO3(0.5 mM). The addition of 150 mM NaCl to the growth medium significantly impaired growth parameters, pigment concentrations, lipid peroxidation, and proline and sodium contents. Simultaneous measurement of chlorophyll fluorescence and P700 redox state revealed that photosystem I (PSI) was more affected by salinity than photosystem II (PSII). The observed detrimental effects caused by salinity were significantly mitigated by silicon supplementation in the growth medium. Stress mitigation by silicon appeared to involve various parameters such as growth, chlorophyll pigment contents, lipid peroxidation, proline content, chlorophyll fluorescence (PSI and PSII machinery), and sodium content. Compared to PSII, PSI parameters (the quantum yield of non-photochemical energy dissipation in reaction centres limited by acceptor side Y(NA), maximal fluorescence yield of illuminated sample with closed PSI centres (P700m’), and oxidized PSI (P700ox)) were more sensitive to salinity. However, a more significant beneficial effect was observed for the PSI complex under silicon application. These results suggest that the advantageous effect of silicon on stressed sea barley plants was strongly associated with the crucial role of this element in protecting the photosynthetic machinery, primarily PSI, enabling this species to overcome salinity damages.

Published
2023
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35. Seasonal Changes in the Plant Growth-Inhibitory Effects of Rosemary Leaves on Lettuce Seedlings

Author

Appiah, Kwame Sarpong, primary, Omari, Richard Ansong, additional, Onwona-Agyeman, Siaw, additional, Amoatey, Christiana Adukwei, additional, Ofosu-Anim, John, additional, Smaoui, Abderrazak, additional, Arfa, Abdelkarim Ben, additional, Suzuki, Yoko, additional, Oikawa, Yosei, additional, Okazaki, Shin, additional, Katsura, Keisuke, additional, Isoda, Hiroko, additional, Kawada, Kiyokazu, additional, and Fujii, Yoshiharu, additional

Published
2022
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