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Increase of Natural ¹⁵N Enrichment of Soybean Nodules with Mean Nodule Mass ¹

Department of Biology, Washington University, St. Louis, Missouri 63130

The ¹⁵N abundance of soybean (Glycine max L. Merrill var Harosoy) nodules is usually greater than it is for other tissues or for atmospheric N₂. Results of experiments in which nodules were separated by size show that the magnitude of the ¹⁵N enrichment is correlated with nodule mass. The results support the hypothesis that ¹⁵N enrichment of nodules results from differential N isotopic fractionation for synthesis of nodule tissue versus synthesis of compounds for export from the nodule. The physiological significance of this hypothesis is that it requires that a substantial fraction of the N for nodule tissue synthesis in ¹⁵N-enriched nodules be N recently fixed within the same nodule.

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				W. Wanek and S. K. Arndt Difference in {delta}15N signatures between nodulated roots and shoots of soybean is indicative of the contribution of symbiotic N2 fixation to plant N J. Exp. Bot., May 1, 2002; 53(371): 1109 - 1118. [Abstract] [Full Text] [PDF]