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Published in Crop Sci 16:791-794 (1976)
© 1976 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effect of Leaf and Pod Removal on the Distribution of 14C Labeled Assimilate in Soybeans1

D. B. Egli, D. R. Gossett and J. E. Leggett2

The effect of varying source-sink ratios on the distribution of 14C labeled assimilate in soybeans (Glycine max (L.) Merr.) was investigated in a greenhouse experiment. Varying source-sink ratios were created by pod (approximately 50%) or leaf removal (two side leaflets from each trifolioliate) at the end of flowering. A single leaf was exposed to 14CO2 17 days after application of the treatments. Pod removal reduced seed yield/plant and increased seed size, whereas leaf removal reduced yield, the number of seed/plant, and seed size. Seven hours after labeling a greater percentage of 14C remained in the leaf in the pod removal treatment (72%) than in either the leaf removal (55%) or the control (59%), and specific leaf weight was higher in the pod removal treatment.

The distribution of 14C 24 hours after labeling was not greatly affected by the treatments. The pod removal treatment had a greater percentage of 14C in the labeled leaf, in the stem both above and below the node of the labeled leaf, and less in the seed. Removal of the leaves did not affect the percentage of 14C in the labeled leaf after 24 hours or the distribution of the 14C in the plant, probably because the source-sink ratio was similar to that of the control. The primary effect of altering the source-sink ratio was on the movement of 14C labeled assimilate out of the leaf.

Key Words: Source-sink relationships • Glycine max (L.) Merrill. Defoliation • Yield components

1 Contribution from the Dep. of Agronomy, Kentucky Agric. Exp. Stn., Lexington. This paper (76-3-20) is published with the approval of the Director of the Kentucky Agric. Exp. Stn.

2 Associate professor, former postdoctoral fellow (now assistant professor, Newberry College, Newberry, SC 29108), and professor, Dep, of Agronomy, Univ, of Kentucky, Lexington, KY 40506.

Received for publication February 18, 1976.




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Copyright © 1976 by the Crop Science Society of America.