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148 results on '"Gardeström P"'

2. In planta study of photosynthesis and photorespiration using NADPH and NADH/NAD+ fluorescent protein sensors

Author

Shey-Li Lim, Chia Pao Voon, Xiaoqian Guan, Yi Yang, Per Gardeström, and Boon Leong Lim

Subjects
Science
Abstract

NADP(H) and NAD(H) are crucial energy molecules in plant metabolism. Here, via the use of circularly permutated fluorescent protein sensors, the authors demonstrate dynamic changes in NADPH and the NADH/NAD+ ratio during photosynthesis and photorespiration at the subcellular level in planta.

Published
2020
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3. Modulating the activities of chloroplasts and mitochondria promotes adenosine triphosphate production and plant growth

Author

Chia P. Voon, Yee-Song Law, Xiaoqian Guan, Shey-Li Lim, Zhou Xu, Wing-Tung Chu, Renshan Zhang, Feng Sun, Mathias Labs, Dario Leister, Mathias Pribil, Marie Hronková, Jiří Kubásek, Yong Cui, Liwen Jiang, Michito Tsuyama, Per Gardeström, Mikko Tikkanen, and Boon L. Lim

Subjects
ATP, AtPAP2, chloroplasts, mitochondria, NADPH, photosynthesis, Plant culture, SB1-1110, Botany, QK1-989
Abstract

Efficient photosynthesis requires a balance of ATP and NADPH production/consumption in chloroplasts, and the exportation of reducing equivalents from chloroplasts is important for balancing stromal ATP/NADPH ratio. Here, we showed that the overexpression of purple acid phosphatase 2 on the outer membranes of chloroplasts and mitochondria can streamline the production and consumption of reducing equivalents in these two organelles, respectively. A higher capacity of consumption of reducing equivalents in mitochondria can indirectly help chloroplasts to balance the ATP/NADPH ratio in stroma and recycle NADP+, the electron acceptors of the linear electron flow (LEF). A higher rate of ATP and NADPH production from the LEF, a higher capacity of carbon fixation by the Calvin–Benson–Bassham (CBB) cycle and a greater consumption of NADH in mitochondria enhance photosynthesis in the chloroplasts, ATP production in the mitochondria and sucrose synthesis in the cytosol and eventually boost plant growth and seed yields in the overexpression lines.

Published
2021
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6. Reklam och propaganda under svenskt 1930-tal

Author

Elin Gardeström

Subjects
propaganda, advertisement, advertising business, conceptual history, 1930s, History of scholarship and learning. The humanities, AZ20-999
Abstract

The article analyzes the use of two concepts, propaganda and advertisement, in the 1930s in Sweden. The study focuses on uses in the advertisement business, which at that time was a heterogeneous field, including military staff, politicians as well as businessmen and artists. By adopting a conceptual history perspective inspired by Reinhart Koselleck, the author pinpoints the meanings that were ascribed to these two concepts in a 1930s’ context, the interdependency between the concepts and other keywords that were used in connection with them. The study reveals how the ambiguous and synonymous use of propaganda and advertisement served different purposes. In the 1930s, propaganda was a key concept of communication and used in manifold ways for selling goods and disseminating ideas. It was hard to avoid the term and propaganda was used to explain the newly introduced American marketing terminology. The field of advertisement was trying to colonize what previously had been labeled as “idea propaganda” and rename it “advertisement”. The relationship between the two concepts was further complicated by the uprising propaganda in totalitarian states before and during World War II. The commercial term public relations was used to legitimate the professional need for experienced admen in the Government agency founded to coordinate the work during the crisis of war.

Published
2018

8. Nitrogen Source Dependent Changes in Central Sugar Metabolism Maintain Cell Wall Assembly in Mitochondrial Complex I-Defective frostbite1 and Secondarily Affect Programmed Cell Death

Author

Anna Podgórska, Monika Ostaszewska-Bugajska, Agata Tarnowska, Maria Burian, Klaudia Borysiuk, Per Gardeström, and Bożena Szal

Subjects
cell wall synthesis, complex I defect, frostbite1, mitochondrial mutant, NDUFS4, necrosis, sugar catabolism, sugar signaling, programmed cell death, reactive oxygen species, Biology (General), QH301-705.5, Chemistry, QD1-999
Abstract

For optimal plant growth, carbon and nitrogen availability needs to be tightly coordinated. Mitochondrial perturbations related to a defect in complex I in the Arabidopsis thalianafrostbite1 (fro1) mutant, carrying a point mutation in the 8-kD Fe-S subunit of NDUFS4 protein, alter aspects of fundamental carbon metabolism, which is manifested as stunted growth. During nitrate nutrition, fro1 plants showed a dominant sugar flux toward nitrogen assimilation and energy production, whereas cellulose integration in the cell wall was restricted. However, when cultured on NH4+ as the sole nitrogen source, which typically induces developmental disorders in plants (i.e., the ammonium toxicity syndrome), fro1 showed improved growth as compared to NO3− nourishing. Higher energy availability in fro1 plants was correlated with restored cell wall assembly during NH4+ growth. To determine the relationship between mitochondrial complex I disassembly and cell wall-related processes, aspects of cell wall integrity and sugar and reactive oxygen species signaling were analyzed in fro1 plants. The responses of fro1 plants to NH4+ treatment were consistent with the inhibition of a form of programmed cell death. Resistance of fro1 plants to NH4+ toxicity coincided with an absence of necrotic lesion in plant leaves.

Published
2018
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13. Session 11 Respiration

Author

Minh, T. Bui, Bauer, H., Eprintsev, A. T., Pinheiro de Carvalho, M. A., Eriksson, M., Gardeström, R., Samuelsson, G., Gardeström, P., Golovko, T. K., Gulyaev, B. I., Igamberdiev, A. A., Popov, V. N., Falaleeva, M. I., Labedzka, E., Sadoch, Z., Hernet, M., Panczyk, T., Lambers, H., Lernmark, U., Mamushina, N. S., Zubkova, E. K., Voitsekhovskaya, O. V., Mikulska, M., Bomsel, J-L., Rychter, A. M., Pobezhimova, T., Voinikov, V., Varakina, N., Borovsky, G., Popova, T. N., Igamberdiev, A. U., Velichko, Yu. I., Scheurwater, I., Cornelissen, C., Tudorake, G. F., Negru, P. V., Cerbu, O. L., Vianello, A., Petrussa, E., Macri, F., Wagner, A. M., Wagner, M. J., Zancani, M., Macri, F., Dal Belin Peruffo, A., and Vianello, A.

Published
1994
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24. Session 10 Photosynthesis

Author

Adamska, I., Kloppstech, K., Andersson, B., Bubolo, L. S., Sharkova, V. E., Büchel, C., Garab, G., Budagovskaya, N. V., Chaika, M. T., Savchenko, G. E., Abramchik, L. M., Serduchenko, E. V., Kluchareva, E. A., Fridlyand, L. E., Giardi, M. T., Komenda, J., Masojídek, J., Kučera, T., Hodges, M., Gucci, R., Everard, J. D., Flore, J. A., Loescher, W. H., Hák, R., Janáček, J., Haumann, J., Bolhar-Nordenkampf, H. R., Hiltonen, T., Karlsson, J., Palmqvist, K., Clarke, A., Samuelsson, G., Hudák, J., Masarovičová, E., Ivanchenko, V. M., Janda, T., Szalai, G., Páldi, E., Szigeti, Z., Jovanič, B. R., Bogdanovič, M. T., Tomaševič, M. N., Keerberg, O., Gardeström, P., Vanova, H. I., Keerberg, H., Pärnik, T., Kissimon, J., Lásztity, D., Páldi, E., Kochubey, S. M., Kornyushenko, G. A., Sapozhnikov, D. I., Kovács, J., Csapó, B., Páldi, E., Böddi, B., Kozklowska, B., Maleszewski, S., Krupa, Z., Öquist, G., Siedlecka, A., Lacuesta, M., Gonzalez-Moro, B., Diaz, A., Gonzalez-Murua, C., Muánoz-Rueda, A., Makeev, A. V., Maksymiec, W., Baszyński, T., Da Silva, J. Marques, Arrabaça, M. C., Muzafarov, E. N., Nazarova, G. N., Davies, C. F., Nazarova, G. N., Muzafarov, E. N., Lyubimov, V. Yu., Davies, C. F., Nogués, S., Baker, N. R., Nosticzius, Á., Nyitrai, P., Sárvári, É., Ungár, D., Lang, F., Ottander, Christina, Öquist, Gunnar, Ouzounidou, G., Pádua, M., Casimiro, A., Pamer, R., Perathoner, C., Bauer, H., Panković, D., Kevrešan, S., Plesničar, M., Sakač, Z., Ćupina, T., Vapa, LJ., Pazurkiewicz-Kocot, K., Peter, S., Roos, M., Schäfer, C., Poot, P., PospíŠilová, J., Čatský, J., Synková, H., Wilhelmová, N., Postl, W., Donis, Klune, R., Bolhar-Nordenkampf, H. R., Kamnalrut, A., Ramazanov, Z., Henk, M. C., Sosa, P. A., Del Rio, M. Jimenez, Gomez-Pincheti, J-L., Reina, G. Garcia, Richter, M., Goss, R., Nguyen, D. T., Wild, A., Romanowska, E., Albertsson, P. -A., Russell, A. W., Schiefthaler, U., Bolhár-Nordenkampf, H. R., Critchley, C., Meister, M., Šantrůček, J., Květoň, J., šimková, M., Roháček, K., Sárvári, É., Nyitrai, P., Scagliarini, S., Trost, P., Pupillo, P., Scheibe, R., Selga, M., Selga, T., Shevchenko, O. V., Panchenko, A. P., Siedlecka, A., Krupa, Z., Baszyński, T., Skórzyńska, E., Špunda, V., Čajánek, M., Kalina, J., Lachetová, I., Sundberg, B., Renhorn, K-E, Esseen, P-A, Sundin, U., Ögren, E., Tamás, L., Sárvári, É., Vácha, F., Durchan, M., Van Loven, K., Synková, H., Valcke, R., Vapaavuori, E. M., Pennanen, A. H., Ruuska, S. A., Vuorinen, A. H., Váradi, Gy., Darkó, É., Pölös, E., Lehoczki, E., Veljović-Jovanović, S., Vučinić, Ž., Heber, U., Bilger, W., Venema, J. H., Van Hasselt, P. R., Vigara, A. J., García-Sánchez, M. I., Gómez-Moreno, C., Vega, J. M., Vilchez, C., Vega, J. M., Vogg, G., Heim, R., Hansen, J., Schäfer, C., Beck, E., Waloszek, A., Sikorska, E., Wieckowski, S., Wilhelmová, N., Kutík, J., Šesták, Z., Wojcieska-Wyskupajtys, U., Zillinger, A., Haumann, J., and Bolhár-Nordenkampf, H. R.

Published
1994
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25. Session 15 Cellular transport

Author

Epel, B., Yahalom, A., Katz, A., Kotlizky, G., Cohen, L., Erlanger, M., Levi, R., Levi, N., Van Lent, J., Belyaeva, N., Nasyrova, G., Simchuk, E., Buckhout, Thomas J., Buntukova, E. K., Karimova, F. G., Klochkova, E. E., Driouich, A., Staehelin, La., Frommer, W. B., Fischer, W. N., Hirner, B., Kwart, M., Lauter, F. R., Ninnemann, O., Rentsch, D., Fuks, B., Homble, F., Getz, H. P., Klein, M., Henricson, D., Opanasenko, V. K., Bergstedt, K. -G., Gardeström, P., Samuelsson, G., Janáček, K., Nešpůrková, L., Beneš, I., Metlička, R., Sigler, K., Jordi, W., Stoopen, G. M., Karnauchov, I., Cai, D., Clausmeyer, S., Herrmann, R. G., KlOsgen, R. B., Lyalin, O. O., Ktitorova, I. N., Marichev, G. A., Skobeleva, O. V., Miklós, E., Szöke, L., Kozma, P., Haydu, Zs., Erdei, L., Moshkov, A. V., Batov, A. Y., Petrussa, E., Marci’, F., Zancani, M., Dell’antone, P., Vianello, A., Seedorf, M., Soll, J., Sokolik, A. I., Yurin, V. M., Szakiel, A., Janiszowska, W., Tokarska, M., Spiewla, E., Vicente, J. A. F., Vale, M. G. P., Weig, A., Dolle, L. -O., Franz, J., Komor, E., Zagdańska, B., and Rybka, Z.

Published
1994
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32. Demonstration Restoration Measures in Tributaries of the Vindel River Catchment

Author

Johanna Gardeström, Daniel Holmqvist, Lina E. Polvi, and Christer Nilsson

Subjects
boulders, large wood, northern Sweden, restoration, river, stream, timber floating, Biology (General), QH301-705.5, Ecology, QH540-549.5
Abstract

Some ecological restoration projects include elements of trial and error where new measures are repeatedly tried, evaluated, and modified until satisfactory results are achieved. Thereafter, the resulting methods may be applied on larger scales. A difficult step is judging whether developed "best-practice" methods have become reasonably ecologically functional or whether further experimentation "demonstration" methods can lead to yet better results. Here, we use a stream restoration project as a case study for evaluating methods and abiotic effects and outlining stakeholder support for demonstration restoration measures, rather than only using best-practice methods. Our work was located in the Vindel River system, a free-flowing river that is part of the Natura 2000 network. The river was exploited for timber floating from 1850-1976, and rapids in the main channel and tributaries below timberline were channelized to increase timber transport capacity. Several side channels in multi-channeled rapids were blocked and the flow was concentrated to a single channel from which boulders and large wood were removed. Hence, previously heterogeneous environments were replaced by more homogeneous systems with limited habitat for riverine species. The restoration project strives to alleviate the effects of fragmentation and channelization in affected rapids by returning coarse sediment from channel margins to the main channel. However, only smaller, angular sediment is available given blasting of large boulders, and large (old-growth) wood is largely absent; therefore, original levels of large boulders and large wood in channels cannot be achieved with standard restoration practices. In 10 demonstration sites, we compensated for this by adding large boulders and large wood (i.e., entire trees) from adjacent upland areas to previously best-practice restored reaches and compared their hydraulic characteristics with 10 other best-practice sites. The demonstration sites exhibited significantly reduced and more variable current velocities, and wider channels, but with less variation than pre-restoration. The ecological response to this restoration has not yet been studied, but potential outcomes are discussed.

Published
2013
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37. Preparation of leaf mitochondria from Arabidopsis thaliana

Author

Keech, Olivier, Dizengremel, Pierre, Gardeström, P., Ecologie et Ecophysiologie Forestières [devient SILVA en 2018] (EEF), Institut National de la Recherche Agronomique (INRA)-Université de Lorraine (UL), and ProdInra, Migration

Subjects
[SDV.BV]Life Sciences [q-bio]/Vegetal Biology, [SDV.BV] Life Sciences [q-bio]/Vegetal Biology
Published
2005

45. Photorespiration Contributes to Stomatal Regulation and Carbon Isotope Fractionation: A Study with Barley, Potato and ArabidopsisPlants Deficient in Glycine Decarboxylase

Author

Igamberdiev, Abir, Mikkelsen, Teis, Ambus, Per, Bauwe, Hermann, Lea, Peter, and Gardeström, Per

Abstract

The rates of respiration in light and darkness, Ci/Caand carbon isotope fractionation were investigated in glycine decarboxylase-deficient plants of barley, potato and Arabidopsis thalianagrown in climate chambers with controlled light intensity, temperature, humidity, irradiation and different CO2concentrations (360, 700 and 1400 µl l−1) and compared to the wild-type plants. All photorespiration-impaired plants exhibited higher Ci/Caand corresponding lower apparent water-use efficiencies, which were more expressed under high irradiance and elevated temperature. The mutants were depleted in 13C as compared to the wild-type plants, with a difference of up to 6‰ following growth in 360 µl l−1CO2. We determined the carbon isotope content at different CO2concentrations to calculate the contribution of both Ci/Caand photorespiration for 13C/12C fractionation. The direct effect of photorespiration was in the range of 0.7–1.0‰, from which we calculated the value of fractionation at the site of glycine decarboxylation as being 10–13‰, which is in agreement with the previously reported carbon isotope discrimination exerted by the glycine decarboxylase. Respiratory rates, particularly in the light, were increased in the glycine decarboxylase mutants. The necessity of the maintenance of a high CO2concentration near the site of carboxylation in chloroplasts in plants deficient in photorespiratory enzymes, requires an increased opening of the stomata with a corresponding decrease in water-use efficiency. It is concluded that photorespiration participates in the regulation of Ci/Caand contributes to carbon isotope fractionation, both via effects on stomata and via discrimination of 13C in the glycine decarboxylase reaction.

Published
2004
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47. A Relationship between Carbonic Anhydrase and Rubisco in Response to Moderate Cadmium Stress during Light Activation of Photosynthesis

Author

Siedlecka, Anna, Gardeström, Per, Samuelsson, Göran, Kleczkowski, Leszek A., and Krupa, Zbigniew

Abstract

In our previous research, we showed that low Cd concentration increases the effectiveness of the processes leading to activation of ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco). This stimulation was dependent on carbonic anhydrase (CA) activity and resulted in protecting Rubisco activity against Cd toxicity. The aim of the present paper was to test whether this mechanism has any influence on light activation of photosynthesis during the first 2 h of illumination. Both the “activation mechanism” of plant response to Cd-stress conditions and its full efficiency at low Cd concentration were confirmed. The CA-dependent light activation of Rubisco at low Cd level was correlated with accelerated attaining of the maximum Rubisco activity by these plants. The amount of Rubisco was also Cd- and timedependent and varied from continuous accumulation in control plants till reaching the maximum level within 30 minutes for the high Cd concentration. An increase in CA activity that was found to be parallel to the decrease of the amount of CA suggested activation of the enzyme by low Cd concentration

Published
1999
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48. Two Separate Transhydrogenase Activities Are Present in Plant Mitochondria

Author

Bykova, Natalia V., Rasmusson, Allan G., Igamberdiev, Abir U., Gardeström, Per, and Møller, Ian M.

Abstract

Inside-out submitochondrial particles from both potato tubers and pea leaves catalyze the transfer of hydride equivalents from NADPH to NAD+as monitored with a substrate-regenerating system. The NAD+analogue acetylpyridine adenine dinucleotide is also reduced by NADPH and incomplete inhibition by the complex I inhibitor diphenyleneiodonium (DPI) indicates that two enzymes are involved in this reaction. Gel-filtration chromatography of solubilized mitochondrial membrane complexes confirms that the DPI-sensitive TH activity is due to NADH–ubiquinone oxidoreductase (EC 1.6.5.3, complex I), whereas the DPI-insensitive activity is due to a separate enzyme eluting around 220 kDa. The DPI-insensitive TH activity is specific for the 4B proton on NADH, whereas there is no indication of a 4A-specific activity characteristic of a mammalian-type energy-linked TH. The DPI-insensitive TH may be similar to the soluble type of transhydrogenase found in, e.g., Pseudomonas.The presence of non-energy-linked TH activities directly coupling the matrix NAD(H) and NADP(H) pools will have important consequences for the regulation of NADP-linked processes in plant mitochondria.

Published
1999
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49. Acclimation of Arabidopsis leaves developing at low temperatures. Increasing cytoplasmic volume accompanies increased activities of enzymes in the Calvin cycle and in the sucrose-biosynthesis pathway.

Author

Strand, A, Hurry, V, Henkes, S, Huner, N, Gustafsson, P, Gardeström, P, and Stitt, M

Abstract

Photosynthetic and metabolic acclimation to low growth temperatures were studied in Arabidopsis (Heynh.). Plants were grown at 23 degrees C and then shifted to 5 degrees C. We compared the leaves shifted to 5 degrees C for 10 d and the new leaves developed at 5 degrees C with the control leaves on plants that had been left at 23 degrees C. Leaf development at 5 degrees C resulted in the recovery of photosynthesis to rates comparable with those achieved by control leaves at 23 degrees C. There was a shift in the partitioning of carbon from starch and toward sucrose (Suc) in leaves that developed at 5 degrees C. The recovery of photosynthetic capacity and the redirection of carbon to Suc in these leaves were associated with coordinated increases in the activity of several Calvin-cycle enzymes, even larger increases in the activity of key enzymes for Suc biosynthesis, and an increase in the phosphate available for metabolism. Development of leaves at 5 degrees C also led to an increase in cytoplasmic volume and a decrease in vacuolar volume, which may provide an important mechanism for increasing the enzymes and metabolites in cold-acclimated leaves. Understanding the mechanisms underlying such structural changes during leaf development in the cold could result in novel approaches to increasing plant yield.

Published
1999
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50. Adenylate ratios in the cytosol, chloroplasts and mitochondria of barley leaf protoplasts during photosynthesis at different carbon dioxide concentrations

Author

Gardeström, Per

Abstract

Barley ( Hordeum vulgare) protoplasts were incubated in darkness and in the light at saturating and limiting CO 2concentrations. The protoplasts were fractioned by a membrane filtration technique which allows quenching of the metabolism by acidification within about 0.1 s and the ATP/ADP ratios in the cytasol, chloroplasts and mitochondria were determined. It is concluded that the cytosolic ATP/ADP ratio is considerably higher during photosynthesis at limiting CO 2(which is the normal situation for a C 3plant in air) compared to photosynthesis at saturating CO 2or darkness.

Published
1987
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