Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 1 July 1981
Published in Agron J 73:623-625 (1981)
© 1981 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Protein and Oil Content of Winged Bean Seeds as Measured by Near-Infrared Light Reflectance1

D. F. Hildebrand, C. Chaven, T. Hymowitz, H. H. Bryan and A. A. Duncan2

Grain analyzers are being utilized by plant breeders to estimate the protein and oil content of various agricultural commodities. The method is rapid and inexpensive. Its potential use for the analysis of winged bean [Psophocarpus tetragonolobus (L.) DC.] seed meal was investigated in this study. Simultaneous estimations of protein and oil concentrations in winged bean seed meals made by a near-infrared light reflectance instrument coupled to an analog computer (grain analyzer) were compared to protein and oil determinations by Kjeldahl and Soxhlet extraction procedures. The correlation between Kjeldahl protein and the grain analyzer values was 0.998. The correlation between Soxhlet extracted oil and the grain analyzer values was 0.995.

The 240 winged bean accessions evaluated in this study were obtained from 16 countries. The seed protein contents ranged from 20.7 to 45.9%. The seed oil contents ranged from 7.2 to 21.5%.

A centrally located grain analyzer facility should be able to monitor the protein and oil values in winged bean cultivar and breeding trials carried out anywhere in the world.

Key Words: Psophocarpus tetragonolobus (L.) DC. • Germplasm

1 Contribution from the Dep. of Agronomy, Univ. of Illinois at Urbana-Champaign, Urbana, IL 61801 and the Agric. Res. and Educ. Ctr., Univ. of Florida, Homestead, FL 33030. Research supported in part by a grant from the Asia Foundation, Illinois Agric. Exp. Stn., Florida Agric. Exp. Stn. and a Univ. of Illinois Fellowship to the senior author.

2 Graduate student, agronomist, professor of plant genetics, Dep. of Agronomy, Univ. of Illinois, professor and director, Agric. Res. and Educ. Ctr., Univ. of Florida, Homestead, Fla.

Received for publication August 1, 1980.




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Copyright © 1981 by the American Society of Agronomy.