Abstract
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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Selected References
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- Kohl D. H., Bryan B. A., Shearer G. Relationship between N(2)-Fixing Efficiency and Natural N Enrichment of Soybean Nodules. Plant Physiol. 1983 Oct;73(2):514–516. doi: 10.1104/pp.73.2.514. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Kohl D. H., Shearer G. Isotopic Fractionation Associated With Symbiotic N(2) Fixation and Uptake of NO(3) by Plants. Plant Physiol. 1980 Jul;66(1):51–56. doi: 10.1104/pp.66.1.51. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Shearer G., Feldman L., Bryan B. A., Skeeters J. L., Kohl D. H., Amarger N., Mariotti F., Mariotti A. N abundance of nodules as an indicator of N metabolism in n(2)-fixing plants. Plant Physiol. 1982 Aug;70(2):465–468. doi: 10.1104/pp.70.2.465. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Shearer G., Kohl D. H., Harper J. E. Distribution of N among plant parts of nodulating and nonnodulating isolines of soybeans. Plant Physiol. 1980 Jul;66(1):57–60. doi: 10.1104/pp.66.1.57. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Steele K. W., Bonish P. M., Daniel R. M., O'hara G. W. Effect of rhizobial strain and host plant on nitrogen isotopic fractionation in legumes. Plant Physiol. 1983 Aug;72(4):1001–1004. doi: 10.1104/pp.72.4.1001. [DOI] [PMC free article] [PubMed] [Google Scholar]