We studied the effects of a low nonlethal temperature (6°C) on the content and composition of polar lipids and their fatty acids in tomato (Lycopersicon esculentum Mill., cv. Sibirskie skorospelye) leaves. We demonstrated that chilling resulted in a decrease in the content of total polar lipids per 1 mg protein. The content of lipids in chloroplast membranes (monogalactosyldiacylglycerols, digalactosyldiacylglycerols, sulfoquinovosyldiacylglycerols, and phosphatidylglycerols) changed less substantially than the content of phospholipids in other cell organelles and in the cytoplasm. Neutral lipids comprised only 1% of total lipids, and their content also decreased after chilling. The relative amounts of unsaturated and saturated fatty acids in polar lipids were practically unchanged. The conclusion was drawn that the maintenance of a high level of chloroplast membrane lipids under low temperatures could play an important role in the survival of cold-tolerant plants.
Russian Journal of Plant Physiology – Springer Journals
Published: Oct 8, 2004
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