Preference of Rj-Soybean Cultivars for Bradyrhizobium japonicum for Nodulation

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In order to investigate the correlation between the preference of soybeans (Glycine max L.) for Bradyrhizobium japonicum for nodulation and their Rj-genotypes, rhizobia were isolated from eight cultivars (non-Rj-cultivars: T202, Tol-1, and CNS-J; Rj_2Rj_3-ones: Hardee, IAC-2, and Bonminori; Rj_4-ones; Hill and Amsoy 71) grown in the field and their compatibilities with Hill and IAC-2 were examined Sixty-three percent of the nodules of the Rj_2Rj_3-cultivars were occupied by rhizobia of nodulation-type C, which were compatible with the Rj_2Rj_3-cultivars but incompatible with the Rj_4-one. Sixty-one percent of the nodules of the Rj_4-cultivars were occupied by isolates of nodulation-type B, which were compatible with the Rj_4-cultivars but incompatible with the Rj_2Rj_3-one. Non-Rj-cultivars preferred rhizobia of nodulation-type A, which were compatible with both Rj-cultivars. To estimate the effect of planting of Rj-cultivars on the rhizobial population in soils, Rj_2Rj_3-(IAC-2) and Rj_4-(Hill) cultivars were inoculated with dilutions of supernatants of suspended soils in which the Rj_4-cultivar (Fukuyutaka) and non-Rj-one (Akisirome) were planted in the preceding year, and the nodule number was counted. Based on the results, it was shown that the planting of the Rj_4-cultivar increased the population of compatible rhizobia with the Rj_4-cultivar and decreased that of the compatible rhizibia with the Rj_2Rj_3-cultivar. Planting of the non-Rj-cultivar did not influence remarkably the rhizobial population in soil. the cultivars IAC-2 (Rj_2Rj_3), Hill (Rj_4), and Orihime (non-Rj) were planted in the soils used in the above experiment, and the nodulation-types of the isolates from the nodules were identified. Marked preference of IAC-2 for type C rhizobia was observed in the soil planted with the non-Rj-cultivar (87%), while for the type A ones in the soil planted with Rj-4-cultivar (87%). IAC-2 significantly preferred the type C rhizobia in the soil containing type C rhizobia, but the type A rhizobia when the number of type C rhizobia was very small as in the Fukuyutaka (Rj_4)-cultivated soil. On the basis of these results, it was suggested that the Rj-genes were involved in the inhibition of effective nodulation by certain serogroups of rhizobia as well as in preference for appropriate rhizobia in relation to nodulation and increase of those populations in soil.
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Preference of Rj-Soybean Cultivars for Bradyrhizobium japonicum for Nodulation

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