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It was difficult to use the pronounced heterosis of indi-ca-japonica hybrids rice due to the panicle sterility causedby male and female gamete abortion.The female gameteabortion in most of subspecific hybrids could be solved byusing an abortion-neutral gene S5-n,a wide compatibilitygene.The problem of male gamete abortion indicated bydistorted segregation of marker genes remained to be stud-ied.Segregation distortion via male gamete had been re-ported on chromosomes 3,7,8,11,and 12.Neverthe-
It was difficult to use the pronounced heterosis of indi-ca-japonica hybrids rice due to the panicle sterility caused by male and female gamete abortion. The female gameteabortion in most of subspecific hybrids could be solved byusing an abortion-neutral gene S5-n, a wide compatibilitygene. The problem of male gamete abortion indicated by segmental segregation of marker genes remained to be stud-ied .Segregation distortion via male gamete had been re-ported on chromosomes 3, 7, 8, 11, and 12.Neverthe-