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Appl Environ Microbiol. 1987 November; 53(11): 2631-2635
Copyright © 1987, American Society for Microbiology. All Rights Reserved.

Nodulation and Competition for Nodulation of Selected Soybean Genotypes among Bradyrhizobium japonicum Serogroup 123 Isolates

H. H. Keyser* and P. B. Cregan

Nitrogen Fixation and Soybean Genetics Laboratory, Agricultural Research Service, U.S. Department of Agriculture, Beltsville, Maryland 20705

ABSTRACT

Twenty recently obtained field isolates of Bradyrhizobium japonicum serogroup 123 were tested for their nodule mass production on the standard commercial soybean (Glycine max (L.) Merr. cv. Williams) and on two soybean plant introduction (PI) genotypes previously determined to restrict nodulation by strain USDA 123. Four of the field isolates showed similar restricted nodulation on the two genotypes, while all 20 isolates produced a normal amount of nodules on G. max cv. Williams. Serological analyses with adsorbed fluorescent antibodies showed that members of the 123 serotype ranked low in nodulation of the two PIs, in contrast to members of serotypes 127 and 129. Competition studies on the PIs indicated that isolates which were restricted were not competitive for nodule occupancy against strain USDA 110. However, unrestricted isolates of serogroup 123 were very competitive against USDA 110. On G. max cv. Williams, all serogroup 123 isolates tested were very competitive against USDA 110.

FOOTNOTES

* Corresponding author.

Appl Environ Microbiol. 1987 November; 53(11): 2631-2635
Copyright © 1987, American Society for Microbiology. All Rights Reserved.



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Copyright © 1987 by the American Society for Microbiology. All rights reserved.