Abstract:The abortive processes of pollen in five genic male sterile lines and one cytoplasmic genetic male sterile line with cytoplasm of wild rice are reported. The authors found that the cytoplasmic-genetic MS Zhenshan 97A line is a typical nuclear degenerative type of pollen abortion. The sign of abortion manifested at the late mononuclear stage. The genic male sterile lines are all typical nuclear proliferative type. They show their apparent abnormality as failure of membrane formation between the two daughter nuclei at the telophase of the first meiotic division. This type of male sterility is very stable, and no flower with dehiscent anthers is present in the panicles.