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Effect of root temperature on lipid and its fatty acid composition in cucumber cucumis sativus and figleaf gourd cucurbita ficifolia roots



Effect of root temperature on lipid and its fatty acid composition in cucumber cucumis sativus and figleaf gourd cucurbita ficifolia roots



Journal of the Japanese Society for Horticultural Science 55(2): 187-193



Concentrations of root total lipids and their fatty acid composition were compared between cucumber (Cucumis sativus L.) cultivars and figleaf gourd (Cucurbita ficifolia Bouche) grown at different root temperature for 10 days. Total lipid and lipid-P concentrations increased at lower root temperatures in all crop roots, but they were higher at all temperatures in figleaf gourd which was more tolerant of low root temperature than cucumber cultivars. Great difference was observed between figleaf gourd and cucumber roots in the fatty acid composition of total lipids in relation to root temperature. In figleaf gourd, linolenate continued to increase toward lower temperatures to attain 57% of total fatty acids at 12.degree. C whereas it increased only at 15.degree. C to a lesser extent in both cultivars of cucumber. This resulted in higher degree of fatty acids unsaturation at lower temperatures in the former plant roots. Relationships between fatty acid composition and plant tolerance to low root temperature are discussed.

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Accession: 005267358

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