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The number of plants with nodules (A) and the number of nodules induced on clover (T. pratense) roots (B) by the wild-type R. leguminosarum bv. trifolii Rt24.2, Rt2472, and Rt2472(pRC24) strains. Statistically significant differences between Rt2472 and Rt24.2, and Rt2472 and Rt2472(pRC24) are shown (*P < 0.05, **P < 0.005; Student's t-test).
