关键词: 柿, 花, 性别分化, 形态观察, 关键时期

Abstract: In order to investigate the morphological key period of floral sex differentiation of persimmon（Diospyros kaki Thunb.），male and female floral buds in different developmental stages of monoecious persimmon cultivar‘Zenjimaru’was respectively observed through paraffin section method and scanning electron microscope. The results showed that the whole development process of both male and female floral buds could be divided into 11 stages ranging from June to May of the next year. There were two morphological key periods about floral sex differentiation in‘Zenjimaru’. One was mid-June （stage 2）with the initiation of sepal primordia，when male flower formed a cymose structure，while only the terminal flower primordium developed in female flower. The other important developmental phase was mid-April（stage 8）with the initiation of megaspore and microspore，during which stamen primordia in female flowers arrested after the filaments differentiated and the pistil primordia in male flowers also arrested after the stigma and style developed，which led to the formation of unisexual flowers.

Key words: persimmon, floral sex, differentiation, morphological investigation, key period