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Publication Type J
Authors Tsydendambaev, V. D., T. V. Ivanova, L. A. Khalilova, E. B. Kurkova, N. A. Myasoedov and Y. V. Balnokin
Title Fatty acid composition of lipids in vegetative organs of the halophyte Suaeda altissima under different levels of salinity
Source Russian Journal of Plant Physiology
Author Keywords Suaeda altissima roots aboveground organs membrane lipids fatty acids unsaturation index salt tolerance maritima l dum plasma-membrane higher-plants salt-resistance spartina-patens na+ transport root-cells stress nacl tolerance
Abstract Qualitative and quantitative composition of fatty acids (FA) in the lipids of vegetative organs of the halophyte Suaeda altissima (L.) Pall. grown at different NaCl concentrations in nutrient solution was studied. Along with this, the biomass of these organs, the content of water and Na+, Cl-, and K+ ions in them, and the ultrastructure of root and leaf cells were determined. At both low (1 mM) and high (750 mM) NaCl concentrations in nutrient solution, plants could maintain growth and water content in organs, demonstrating a noticeable increase in the dry weight and a slight increase in the water content at 250 mM NaCl. At all NaCl concentrations in nutrient solution, S. altissima tissues contained a relatively high K+ amount. Under salinity, Na+ and Cl- ions contributed substantially into the increase in the cell osmotic pressure, i.e., a decrease in their water potential; in the absence of salinity, K+ fulfilled this function. In the cells of both roots and leaves, NaCl stimulated endo- and exocytosis, supposedly involved in the vesicular compound transport. 750 mM NaCl induced plasmolysis and changes in the membrane structure, which can be interpreted as degradation processes. Under optimal NaCl concentration in medium (250 mM), the content of lipids in plant aboveground organs per fresh weight was more than 2.5-fold higher than under 1 or 750 mM NaCl, whereas in the roots opposite patten was observed. When plants were grown under non-optimal conditions, substantial changes occurred in the qualitative and quantitative FA composition in lipids of both aboveground organs and roots. Observed changes are discussed in relation to processes underlying S. altissima salt tolerance and those of disintegration occurring at the high external NaCl concentration (750 mM).
Author Address [Tsydendambaev, V. D.; Ivanova, T. V.; Khalilova, L. A.; Kurkova, E. B.; Myasoedov, N. A.; Balnokin, Yu. V.] Russian Acad Sci, Timiryazev Inst Plant Physiol, Moscow 127276, Russia. Tsydendambaev, VD (reprint author), Russian Acad Sci, Timiryazev Inst Plant Physiol, Bot Skaya Ul 35, Moscow 127276, Russia. vdt@ippras.ru
ISSN 1021-4437
ISBN 1021-4437
29-Character Source Abbreviation Russ. J. Plant Physiol.
Publication Date Sep
Year Published 2013
Volume 60
Issue 5
Beginning Page 661-671
Digital Object Identifier (DOI) 10.1134/s1021443713050142
Unique Article Identifier WOS:000323424200009
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