Differences in Numbers of Nodules and Lateral Roots between Soybean (Glycine max L. Merr.) Cultivars, Kitamusume and Toyosuzu

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Two cultivars of soybean (Glycine max L. Merr.), Kitamusume and Toyosuzu were grown with commercially-purchased granulated soil in a greenhouse. Kitamusume formed a larger number of nodules per g shoot dry weight and its nodules showed a smaller average diameter and average dry weight per nodule than Toyosuzu regardless of plant age or rhizobial strains (Bradyrhizobium japonicum (A1017, J5033, 646, J1B140), B. elkanii (USDA94), and Rhizobium fredii (MAFF210054)) inoculated at the rate of 10^8-10^9 cells per 3 L pot. These differences were observed in the nodules formed oh both primary and lateral roots. With a lower inoculation dose of rhizobia (10^2 and 10^5 cells per pot), Kitamusume formed a smaller number of larger modules than Toyosuzu inoculated with 10^8-10^9 cells per pot. This result indicated that the number of nodules was the factor directly controlled by host, because the size of the nodules was not determined by the genetic background, but changed dependihg on the number of modules formed. The number of the first order lateral roots of 21 d old Kitamusume was 1.49 times larger than that of Toyosuzu. The relationship between the number of nodules and the number of first order lateral roots of 14 cultivars showed a significant positive correlation. These results indicated that the formation of nodules and lateral roots may be similarly controlled by a certain factor in different cultivars.
社団法人日本土壌肥料学会の論文