关键词: 梨, 单花, 纯花芽, 花芽分化, 花原基

Abstract: The‘Danhua’pear is a bud mutation type with single flower and single fruit which was found in Daxiangshui pear（Pyrus ussriensis Maxim.）. In this research，to understand the development process of the flower bud with single flower of Danhua pear，the characteristics and differential process of floral bud were studied through field investigation and microstructure observation，and Daxiangshui pear was used as control. The results showed that the Danhua pear had two types of flower buds，incomplete mixed bud and simple flower bud，which is different from Daxiangshui pear and other pear cultivars. The single-flower inflorescence of Danhua pear formed at the early stage of flower bud differentiation. Danhua pear developed only one flower primordium during morphological differentiation of floral bud，while Daxiangshui pear developed multi-flower primordium at the same stage.

Key words: pear, single flower, simple flower bud, flower bud differentiation, flower primordium