Dinitrogen (15N2) fixation and acetylene reduction in free-living strains ofRhizobium |
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| Authors: | Tsuneo Kaneshiro Jack W. Newton Edward Selke Morey E. Slodki |
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| Affiliation: | (1) Northern Regional Research Center, Agricultural Research, Science and Education Administration, U. S. Department of Agriculture, 1815 North University Street, 61604 Peoria, Illinois, USA |
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| Abstract: | Dinitrogen (15N2) fixation of four free-livingRhizobium strains ranged from 0.8 to 2.3 μmol/mg biomass N. Parallel-grown cultures liberated 4–8 μmol hydrogen and reduced 12–23 μmol acetylene, giving a mean ratio of reduced acetylene-to-fixed15N2 of 12. This ratio contrasts with lower values others have observed for asymbiotic diazotrophs. |
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