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[Studies concerning the biology of rhizobia. 1. Communication: serological investigations (author's transl)].

According to earlier studies the strains of the rhizobia could be put into three biochemical groups (A, B, C) independently of the nodules of which kind of plants having been isolated from. The aim of our experiments has been the determination of the antigenic structure of these rhizobia strains. Regarding the agglutination tests only 24 strains from the 47 ones were agglutinated by A sera, one B strain from the 3 B ones, and 2 C strains from the C ones gave positive reaction with B and C sera, respectively.