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Since the sterility-neutral allele Sn5 has been incorporatedinto indica or japonica varieties, many intersubspecifichybrids have been released commercially. These hybridsshowed high heterosis, but some of them exhibited unstableseed setting at under low temperature. When the hybridsflowered at low temperaure, the fertility of female gametewas normal but the pollen showed sterile. To improve thestability of fertility, the effect of pollen sterility-neutralgene was studied for intersubspecific hybrids.
Since the sterility-neutral allele Sn5 has been incorporatedinto indica or japonica varieties, many intersubspecifichybrids have been released commercially. These hybridsshowed high heterosis, but some of these unstable current setting conditions at under low temperature. When the hybridsflowered at low temperaure, the fertility of female gametewas normal but the pollen showed sterile. To improve the stability of fertility, the effect of pollen sterility-neutralgene was studied for intersubspecific hybrids.