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Plant Physiology 70:132-135 (1982)
© 1982 American Society of Plant Biologists

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Articles

Relationships of Leaf Fatty Acids to Cold Hardening of Citrus Seedlings

Harold E. Nordby and George Yelenosky

United States Citrus and Subtropical Products Laboratory, 1 Winter Haven, Florida 33880, United States Horticultural Research Station, Orlando, Florida 32803

Three cultivars of citrus with different sensitivities to freezing temperatures (citron, Citrus medica L.; rough lemon, C. limon Burm. F; sour orange, C. aurantium L.) were cold hardened for 4 weeks. Lipids from leaves of hardened and control seedlings were fractionated and analyzed for fatty acids. The absolute amount of triglycerides and phospholipids increased in the leaves upon hardening. With hardening, total linoleic acid also increased 141% in citron, 210% in rough lemon, and 233% in sour orange. Specific increases in linoleic acid were found in triglycerides, in the four phospholipids (phosphatidylcholine, phosphatidylethanolamine, phosphatidylinositol, phosphatidylglycerol), and in neutral lipids more polar than triglycerides. Trans-3-hexadecenoic acid was found only in phosphatidylglycerol.

1 Southern Region, Agricultural Research Service, United States Department of Agriculture.






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ASPB Publications PLANT PHYSIOLOGY THE PLANT CELL
Copyright © 1982 by the American Society of Plant Biologists