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Science 4 August 1978:
Vol. 201. no. 4354, pp. 448 - 450
DOI: 10.1126/science.201.4354.448
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Articles

Mutant Strains of Rhizobium japonicum with Increased Ability to Fix Nitrogen for Soybean

ROBERT J. MAIER 1 and WINSTON J. BRILL 1

1 Department of Bacteriology and Center for Studies of Nitrogen Fixation, University of Wisconsin, Madison 53706

A strain of Rhizobium japonicum used in commercial inoculants was mutagenized and screened by a rapid effectiveness assay with soybean plants. Two mutant strains nodulated the roots earlier than the wild type and also expressed greater symbiotic nitrogen-fixing activity than the wild type in the presence and absence of fixed nitrogen. In addition, one of the mutants formed more root nodules than the wild type. Plants inoculated with these strains had increased dry weights (sim60 percent) and nitrogen content (sim100 percent) when grown in growth chambers.

Submitted on December 19, 1977


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Mutants of Rhizobium japonicum with Increased Hydrogenase Activity.
D. MERBERG and R. J. MAIER (1983)
Science 220, 1064-1065
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