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Effects of POD Removal Upon Seeds of Nodulating and Nonnodulating Soybean Line¹

Previous studies have shown that removal of developing pods from soybean (Glycine max (L.) Merr.) plants can result in prolonged nodule activity and in increased percent protein content of the remaining seeds. In order to investigate the hypothesis that the increase in percent seed protein is associated with the lengthened period of N fixation, we initiated this study in which we compared the responses of nodulating and nonnodulating lines to pod removal. Depodding increased average seed weight and percent protein and, in most cases, decreased percent oil in both nodulating and nonnodulating lines. Apparently, increases in seed size and percent protein following pod removal result from reduction of competition from other pods rather than from prolonged N fixation during pod filling.

Key Words: N fixation • Seed protein

² Graduate research assistant, professor of plant genetics, and research assistant, respectively.

Received for publication September 13, 1978.

This article has been cited by other articles:

				D. B. Egli and W. P. Bruening Accumulation of Nitrogen and Dry Matter by Soybean Seeds with Genetic Differences in Protein Concentration Crop Sci., February 6, 2007; 47(1): 359 - 366. [Abstract] [Full Text] [PDF]