摘要: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 incross of RM1×Ohchikara were as follows: F_1(RM1×Ohchikara),B’_u{RM1×(RM1×O-hchikara)F_1},B’_(11){(RM1×Ohchikara)F_1×RM1},B_(12){Ohchikara×(RM1×Ohchikara)F1},and B’_(12){(RM1×Ohchiara)F_1×O-hchikara}.F_2 was obtained by F_1 selfing.Incross of RM2×Ohchikara,the correspondingF_1,B_(11),B’_(11).B_(12),B’_(12),and F_2 were also ob-tained.Reciprocal crosses were alsocarried be-tween RM1 and RM2.The germinated seeds of P_1,P_2,F_1,F_2,