Host plant control of the inheritance of dinitrogen fixation in the Pisum-Rhizobium symbiosis
- 55 Downloads
The contribution of the host plant genome in symbiotic dinitrogen fixation has received little attention. In examining more than two thousand samples from the USDA Plant Introduction Collection, host-determined genetic variation in dinitrogen fixation has been found. In genetic analysis of a mutant line of Pisum resistant to nodulation, two genes designated Sym2 and Sym3 have been detected; Sym2 affects nodulation while Sym3 influences fixation. The two genes segregate independently as dominant Mendelian characters. Effective symbiosis requires the presence of at least one dominant gene at each locus.
KeywordsGenetic Variation Plant Physiology Genetic Analysis Host Plant Plant Control
Unable to display preview. Download preview PDF.
- Gelin, O. & S. Blixt, 1964. Root nodulation in peas. Agric. hortique genetica 22: 149–159.Google Scholar
- Holl, F. B., 1973. A nodulating strain of Pisum unable to fix nitrogen. Plant Physiol. 51 (suppl.): 35.Google Scholar
- Holl F. B. & T. A. G. LaRue, 1975. Genetics of legume plant hosts. Proc. int. Sym. Nitrogen Fixation. Pullman, Washington, 1974 (in press).Google Scholar
- LaRue, T. A. G. & W. G. W. Kurz, 1973. Estimation of nitrogenase in intact legumes. Can. J. Microbiol. 19: 304–305.Google Scholar
- Lie, T. A., 1971. Symbiotic nitrogen fixation under stress conditions. Plant Soil, Special volume, pp. 117–127.Google Scholar
- Nutman, P. S., 1956. The influence of the legume in root-nodule symbiosis. Biol. Rev. 31: 109–151.Google Scholar
- Stanier, R. Y., 1974. The relationships between nitrogen fixation and photosynthesis. Aust. J. exp. Biol. med. Sci. 52: 3–20.Google Scholar
- Wilson, D. O. & H. M. Riesenauer, 1963. Cobalt requirement of symbiotically grown alfalfa. Plant Soil 19: 364–373.Google Scholar