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Plant Physiology 70:1626-1630 (1982)
© 1982 American Society of Plant Biologists

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Articles

A Comparative Study of the Physiology of Symbioses Formed by Rhizobium japonicum with Glycine max, Vigna unguiculata, and Macroptilium atropurpurem1

Harold H. Keyser, Peter van Berkum2 and Deane F. Weber

United States Department of Agriculture, Agricultural Research Service, Plant Physiology Institute, BARC-West, Beltsville, Maryland 20705, Cell Culture and Nitrogen Fixation Laboratory, BARC-West, Beltsville, Maryland 20705

Although Rhizobium japonicum nodulates Vigna unguiculata and Macroptilium atropurpurem, little is known about the physiology of these symbioses. In this study, strains of R. japonicum of varying effectiveness on soybean were examined. The nonhomologous hosts were nodulated by all the strains tested, but effectiveness was not related to that of the homologous host. On siratro, compared to soybean, many strains reversed their relative effectiveness ranking. Both siratro and cowpea produced more dry matter with standard cowpea rhizobia CB756 and 176A22 than with the strains of R. japonicum. Strains USDA33 and USDA74 were more effective with siratro and cowpea than with soybean. The strain USDA122 expressed high rates of hydrogenase activity in symbiosis with the cowpea as well as the soybean host. The strains USDA61 and USDA74 expressed low levels of hydrogenase activity in symbiosis with cowpea, but no activity was found with soybean. Our results indicate host influence for the expression of hydrogenase activity, and suggest the possibility of host influence of nitrogenase for the allocation of electrons to N2 and H+.

2 Supported by Cooperative Agreement 12-14-1001-1387 between the Cell Culture and Nitrogen Fixation Laboratory and the Agronomy Department, University of Maryland.

1 Supported by United States AID—United States Department of Agriculture RSSA 4-76. Scientific article No. A-3224, contribution No. 6295 of the Maryland Agricultural Experiment Station, Department of Agronomy, College Park, Maryland 20742.






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Copyright © 1982 by the American Society of Plant Biologists