RT Journal Article
SR Electronic
T1 A Comparative Study of the Physiology of Symbioses Formed by <em>Rhizobium japonicum</em> with <em>Glycine max, Vigna unguiculata</em>, and <em>Macroptilium atropurpurem</em>
JF Plant Physiology
JO Plant Physiol.
FD American Society of Plant Biologists
SP 1626
OP 1630
DO 10.1104/pp.70.6.1626
VO 70
IS 6
A1 Keyser, Harold H.
A1 van Berkum, Peter
A1 Weber, Deane F.
YR 1982
UL http://www.plantphysiol.org/content/70/6/1626.abstract
AB 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+.