Abstract
ELISA and antibody adsorption tests were applied to determine the minimal somatic antigen constitution of 243 strains of Bradyrhizobium sp. (Arachis) using 12 antisera. The 243 indigenous bradyrhizobial isolates were from 15 sites in four regions of Thailand. A total of 29 serogroups were identified. Most (80%) of the isolates tested had at least one heat-stable antigen in common with strain 280A, forming a so-called 280A serocluster. At 11 of 15 sites tested, 53 to 100% of the isolates fell into one or two predominant serogroups. The serological properties of the indigenous bradyrhizobia were not related to the cropping history of the cultivated fields from which they were isolated.
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