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Plant Physiology 57:556-559 (1976)
© 1976 American Society of Plant Biologists

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Articles

Involvement of Phospholipids in Triglyceride Biosynthesis by Developing Soybean Cotyledons 1,2

Richard F. Wilson and Robert W. Rinne

a United States Department of Agriculture, Agricultural Research Service, Department of Agronomy, University of Illinois at Urbana-Champaign, Illinois 61801

The incorporation of phospholipids specifically labeled with glycerol-23H and acyl-14C by whole cell tissues of developing soybean cotyledons (Glycine max L.) reveals that phosphatidylinositol, phosphatidylcholine, phosphatidylethanolamine, N-acylphosphatidylethanolamine, and phosphatidic acid can be metabolized to diglyceride. The diglyceride formed may be recylced into phospholipid or acylated to triglyceride. Diglyceride from phosphatidic acid and phosphatidylethanolamine is used readily in triglyceride biosynthesis compared to the other phospholipids. Incorporation of N-acylphosphatidylethanolamine having [9-10-3H(N)]oleic acid esterified at sn-3 in cotyledons shows rapid acyltransfer of 3H into triglyceride and therefore N-acylphosphatidylethanolamine appears to participate in triglyceride biosynthesis as an acyl donor. These studies emphasize phospholipid metabolism in developing soybean cotyledons is a dynamic process which plays a key role in triglyceride formation.

1 Cooperative investigation of the Agricultural REsearch Service, United States Department of Agriculture, and Illinois Agricultural Experiment Station.

2 This research represents partial fulfillment of Ph.D. of R. F. W.






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Copyright © 1976 by the American Society of Plant Biologists