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<正>Two short root mutants,RM1 and RM2,wereobtained by treating a japonica rice variety O-hchikara with gamma ray.Seedling of RM1RM2,Ohchikara,(RM1×Ohchikara)F_1,and(RM2×Ohehikara)F_1 were cultured withKimura’s B solution.Generations made i