Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 11:211-213 (1971)
© 1971 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Relationship of Fatty Acid Formation and Chlorophyll Content in Soybean Seed1

W. R. Fehr, J. C. Thorne and E. G. Hammond2

We compared fatty acid formation in soybean (Glycine max (L.) Merrill) seeds with a normal level and low level of chlorophyll. A low level of chlorophyll in the seed of four genotypes was obtained by covering nodes with aluminum foil before pods were visible. Seeds of known age were harvested from covered and uncovered nodes at 4-day intervals beginning 22 days after flowering and continuing until maturity. The percentage of palmitic, stearic, oleic, linoleic, and linolenic acid in the oil was determined by gas-liquid chromatography.

Although fatty acid composition of the oil changed markedly during seed development, there were no large differences in the pattern of fatty acid formation among genotypes or between the covered and uncovered treatments. The similarity of linolenic acid percentage in seeds with a normal or low level of chlorophyll indicated that linolenic acid formation was not closely related to chlorophyll content in soybean seed.

Key Words: Glycine max (L.) Merrill • Palmitic • Stearic • Oleic • Linoleic • Linolenic

1 Joint contribution from the Iowa Agriculture and Home Economics Experiment Station, Ames, Iowa, 50010, as Journal Paper No. J-6556, Project No. 1179, and the Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture as No. 634 of the U. S. Regional Soybean Laboratory. The authors gratefully acknowledge support of this project from the Iowa Development Commission, Des Moines, Iowa, and Unilever, Rotterdam, The Netherlands.

2 Associate Professor of Agronomy and Collaborator, Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, Iowa State University; Research Associate, Iowa State University (present address: Soybean breeder, Northrup, King and Company, Washington, Iowa); and Professor of Food Technology, Iowa State University, respectively.

Received for publication June 20, 1970.




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