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Plant Physiology 57:375-381 (1976)
© 1976 American Society of Plant Biologists

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Studies on Lipid Synthesis and Degradation in Developing Soybean Cotyledons 1

Richard F. Wilson2 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 metabolic activity of individual lipid classes found in developing soybean cotyledons (Glycine max.) is estimated by determining the degradation rate of the compound under given conditions. Pulse-labeling and dual substrate labeling are used to evaluate this parameter. These studies indicate first order decay kinetics for phosphatidic acid, phosphatidylinositol, phosphatidylcholine, phosphatidylethanolamine, N-acyl-phosphatidylethanolamine, diglyceride, and zero order kinetics for triglyceride in cotyledons var. "Harosoy 63" at 30 days after flowering. Decay coefficients for acyl groups and lipid-glycerol moieties within specific lipid classes from either method are comparable. Half-life (t1/2) calculations from the decay coefficients indicate extremely rapid turn-over rates (0.08 to 3.4 hours at 25 C) and suggest similar turnover rates of acyl groups and lipid-glycerol in diglyceride and all phospholipids except N-acylphosphatidylethanolamine where acyl groups are replaced independent of the glycerol moiety. These experiments reveal not only different metabolic activity between lipid components of soybean cotyledons, but also describe a new method for measuring lipid turnover in plants.

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

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






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Copyright © 1976 by the American Society of Plant Biologists