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. 1977 Feb;129(2):718–723. doi: 10.1128/jb.129.2.718-723.1977

Nitrogen fixation in nitrate reductase-deficient mutants of cultured rhizobia.

J D Pagan, W R Scowcroft, W F Dudman, A H Gibson
PMCID: PMC235003  PMID: 838684

Abstract

Forty-eight mutants unable to reduce nitrate were isolated from "cowpea" Rhizobium sp. strain 32Hl and examined for nitrogenase activity in culture. All but two of the mutants had nitrogenase activity comparable with the parental sttain and two nitrogenase-defective strains showed alterations in their symbiotic properties. One strain was unable to nodulate either Macroptilium atropurpureum or Vigna uguiculata and, with the other, nodules appeared promptly, but effective nitrogen fixation was delayed. These results, and the relatively low proportion of nitrate reductase mutants with impaired nitrogenase activity, do not support the proposed commanality between nitrogenase and nitrate reductase in cowpea rhizobia. Inhibition studies of the effect of nitrate and its reduction products on the nitrogenase activity in cultured strains 32Hl and the nitrate reductase-deficient, Nif+ strains, indicated that nitrogenase activity was sensitive to nitrite rather than to nitrate.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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