应用解剖学方法对‘无核世纪梨’授粉受精过程进行了系统观察,发现‘无核世纪梨’自花授粉花粉管不能进入胚囊,用‘雪青’梨异花授粉花粉管48h进入胚囊。异花授粉后在受精过程中,一个精子不能进入卵膜或进入卵膜后雌雄核不融合,另一个精子与极核也不能正常融合,不能形成胚乳,双受精失败,从而导致种子败育,最终形成无籽果实。 An anatomical method was used to systematically observe the pollination and fertilization process of seedless pear. It was found that self-pollination pollen tube of seedless pear could not enter the embryo sac and the pollen tube of ’Xueqing’ pear cross-pollination entered the embryo sac . After cross-pollination in the fertilization process, a sperm can not enter the egg or enter the egg after the male and female nuclear fusion, the other can not be a normal polar and polar fusion, can not form endosperm, double fertilization failure, resulting in seed abortion, The final formation of seedless fruit.