Water stress induced changes in the leaf lipid composition of four grapevine genotypes with different drought tolerance |
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| Authors: | I Toumi M Gargouri I Nouairi P N Moschou A Ben Salem-Fnayou A Mliki M Zarrouk A Ghorbel |
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| Institution: | (1) Laboratory of Grapevine Molecular Physiology, Route Touristique de Soliman 95, Hammam-Lif, 2050, Tunisia;(2) Laboratory of Characterization and Quality of Olive Oil, Route Touristique de Soliman 95, Hammam-Lif, 2050, Tunisia;(3) Laboratory of Plant physiology and Biotechnology, University of Crete, Heraklion, Greece |
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| Abstract: | To dissect differences in both lipid accumulation and composition and the role of these modifications during drought stress,
four grapevine cultivars exhibiting differential tolerance to drought were subjected to water shortage. Tolerant cultivars,
Kahli Kerkennah and Cardinal, exhibited higher leaf water potential (Ψw), and lower lipid peroxidation compared to the sensitive cultivars Guelb Sardouk and Superior Seedless during stress. Total
lipid amounts increased during stress only in the leaves of the tolerant cultivars. Drought induced increases in the ratios
digalactosyldiacylglycerol/monogalactosyldiacylglycerol and phosphatidylcholine/phoshatidylethanolamine of almost all the
drought stressed cultivars. Moreover, the overall analysis of the composition of fatty acids revealed that a linolenic acid
was prevalent in grapevine and the unsaturation level of lipids increased under water stress in all the cultivars. Specific
adjustments in the lipid composition during stress could compromise stress tolerance. |
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| Keywords: | glycolipids leaf water potential peroxidation phospholipids unsaturation Vitis vinifera |
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