通过在花期用MCPB-ethyl处理,对富士苹果花粉的发芽、花粉管的伸长以及胚珠的发育等进行了形态方面的观察和探讨,以阐明MCPB-ethyl的疏花机制。结果表明,MCPB-ethyl对花粉的发芽及花粉管的伸长没有影响,整个受精过程与对照相同,没有发现异常。但受精后胚乳核只进行了数次分裂便停止生长,此后珠皮、珠心细胞迅速解体。根据以上结果,认为MCPB-ethyl的疏花效果不是通过影响花粉的发芽或花粉管的伸长阻碍受精所致,而是使胚和胚珠的发育停止,形成离层导致了落花。 Through the treatment of flowering with MCPB-ethyl, the morphology of Fuji apple pollen germination, pollen tube elongation and ovule development were observed and discussed in order to clarify the mechanism of flowering MCPB-ethyl. The results showed that MCPB-ethyl had no effect on pollen germination and pollen tube elongation. The whole fertilization process was the same as the control, and no abnormalities were found. However, after fertilization endosperm nucleus only a few times to stop the growth of cell division, then pearl, pearl heart cells quickly disintegrated. Based on the above results, it is considered that the flowering effect of MCPB-ethyl does not result from fertilization by affecting the germination of pollen or the elongation of the pollen tube, but stops the development of embryos and ovules, causing the fall of the MCPB-ethyl.