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Effect of Leaf and Pod Removal on the Distribution of 14 C Labeled Assimilate in Soybeans 1
Author(s) -
Egli D. B.,
Gossett D. R.,
Leggett J. E.
Publication year - 1976
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1976.0011183x001600060013x
Subject(s) - point of delivery , biology , horticulture , main stem , sink (geography) , greenhouse , agronomy , cartography , geography
The effect of varying source‐sink ratios on the distribution of 14 C 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 14 CO 2 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 14 C 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 14 C 24 hours after labeling was not greatly affected by the treatments. The pod removal treatment had a greater percentage of 14 C 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 14 C in the labeled leaf after 24 hours or the distribution of the 14 C 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 14 C labeled assimilate out of the leaf.