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Plant Physiology 61:1014-1016 (1978)
© 1978 American Society of Plant Biologists

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Articles

Studies on the Metabolism of Lipid Molecular Species in Immature Soybean Cotyledons 1

Richard F. Wilson2 and Robert W. Rinne

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

Metabolism of lipid molecular species in soybean cotyledons (Glycine max [L.] Merr. var. "Harosoy 63") was determined from incorporation studies with radioactive acetate and glycerol. Lipid synthetic activity was highest in immature cotyledons at 30 days after flowering. Distinct differences in labeling patterns of molecular species within lipid classes demonstrated that selective utilization of diglyceride intermediates occurred in complex lipid biosynthesis in soybean. The phospholipid molecular species in this tissue that displayed the highest turnover rates had the following acyl combinations: saturate-linoleic and dioleic in phosphatidic acid; saturate-oleic in phosphatidylinositol and phosphatidylethanolamine; dioleic in phosphatidylcholine; oleic-dilinoleic in N-acylphosphatidylethanolamine. Saturate-dilinoleic, oleic-dilinoleic, trioleic, and trilinoleic structures were rapidly synthesized species of triglyceride in immature soybean cotyledons.

2 Present address: Crop Science Department, 4124 Williams Hall, North Carolina State University, Raleigh, North Carolina 27607.

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






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Copyright © 1978 by the American Society of Plant Biologists