COMPETITION BETWEEN 2 SOMATIC SEROTYPES OF RHIZOBIUM JAPONICUM USED AS DOUBLE-STRAIN INOCULA IN VARYING PROPORTIONS

The nodulation response of soybeans (Glycine max, Mukden variety) to single-strain inocula was related to the density of suspensions. The competition between two different somatic serotypes, represented by the strains D 216 and D 344, was also found to be generally related to the ratio of inoculum strain cells in suspensions, but the strain D 216 was more successful in the root-nodule formation, accounting for 100-80 percent of the serotyped root-nodules when the ratio between cells of the strains D 216 and D 344 varied between 3:5 and 1:60. © 1969 Springer-Verlag.