Fatty acid content during reconstitution of the photosynthetic apparatus in the air-dried leaves of Xerophyta scabrida after rehydration |
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Authors: | K Georgieva A Ivanova S Doncheva S Petkova D Stefanov E Péli and Z Tuba |
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Institution: | (1) Plant Ecology Research Group of Hungarian Academy of Sciences, Godollo, Hungary;(2) Department of Botany and Plant Physiology, Faculty of Agricultural and Environmental Sciences, Szent Istv?n University G?d?llő, P?ter K. u.1, 2103 Godollo, Hungary;(3) Botanical Institute (Molecular Biology and Biochemistry of Plants), Karlsruhe Institute of Technology, University Division, Kaiserstr. 12, 76133 Karlsruhe, Germany; |
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Abstract: | Desiccation of Xerophyta scabrida caused considerable damage of chloroplast ultrastructure together with a complete loss of chlorophyll. Upon rehydration,
the relative water content of the pale-green leaves almost reached that of the dark-green ones, however, the Chl content and
photosynthetic activity remained lower. The process of reconstitution of the photosynthetic apparatus in the re-greening leaves
was accompanied by changes in fatty acid (FA) content. The amount of the FA methyl esters was more than 2-fold higher in the
green leaves as compared to the dry ones and slightly increased after rehydration in the pale-green leaves. Among the three
main fatty acids in the leaves, oleic, palmitic and linoleic acid, the latter increased more than 3-fold during rehydration.
This acid is concentrated mainly in the glycolipids and this was an indirect indication for the restoration of the photosynthetic
apparatus. Our results showed that rehydration of X. scabrida led to a decrease of the saturated FA in parallel with an increase of the unsaturated FA, thus indicating increased membrane
permeability. The observed changes in the lipid content can be considered as a characteristic feature of X. scabrida and most probably of other poikilochlorophyllous species. |
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