Plant Physiol.
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Plant Physiology 42:585-597 (1967)
© 1967 American Society of Plant Biologists

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Articles

Isolation and Characterization of Peanut Spherosomes

T. J. Jacks1, L. Y. Yatsu and A. M. Altschul

Seed Protein Pioneering Research Laboratory 2, P. O. Box 19687, New Orleans, Louisiana 70119

Spherosomes of cotyledons of germinating peanuts (Arachis hypogea L.) were examined by electron microscopy and found to be particles about 1.0 to 2.0 µ in diameter bounded by a limiting membrane. Isolated spherosomes appear similar to spherosomes in situ. The isolated spherosomes are composed of 98.1% total lipids, 0.77% phospholipid and 1.27% protein by dry weight. The amounts of protein and phospholipid associated with the isolated spherosomes are sufficient to account for limiting membranes. Spherosomes amply account for the lipid in a peanut cotyledon. The activity of lipase and fatty acyl-Coenzyme A synthetase is not associated with the isolated spherosomes. This suggests that peanut spherosomes are principal sites of lipid storage but not of lipid degradation.

1 Postdoctoral Research Associate.

2 One of the laboratories of the Southern Utilization Research and Development Division, Agricultural Research Service, United States Department of Agriculture.






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ASPB Publications PLANT PHYSIOLOGY THE PLANT CELL
Copyright © 1967 by the American Society of Plant Biologists