＜正＞ The eytological basis of pollen abortion was investigated in rice genetic male sterile（GMS） lines controlled by single recessive genes. Four types, namely stainable pollen abor-tion （SPA）, partial pollen abortion （PPA）, complete pollen abortion （CPA）, and no pollen（NP）, were compared with the original cultivar M-101. Observations on chromosome beha-vior and tetrad analysis at meiosis showed that apparent chromosome aberrationswere closely related to the sterility in these GMS lines. The cytological abnor-malities occurring during the pollen development in these rice GMS lines were more pro-found and extensive than those reported in cytoplasmic male sterile （CMS） rice. At leastthirteen kinds of abnormalities were seen from the pre-meiotic stages to post-meiotic stagesin this study. The existence of microsporocytic pseudoplasmodium, sticking pollen, andpollen dissolution implied that abnormalities were occurring simultaneously in the anther walllayers, particularly in the tapetum.
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