【Objective】 Experiments were performed to observe pollen development of the ‘Ougan' and its seedless mutant ‘Wuzi Ougan' and to find cytological mechanism of the pollen abortion. 【Method】 Anther development and pollen morphology were examined by semi-thin sections, scan electronic microscopy(SCM) and transmission electronic microscopy in ‘Wuzi Ougan' and its wild type(Ougan). 【Result】 The results showed that compared with the fertile line seedy Ougan, the pollen grains of ‘Wuzi Ougan' remained empty and abn...