In order to explore the differences of pollen germination and the pollen tube growth of Malus sieversii,this paper used different S-genotypes of Malus sieversii plants as testing materials,by the way of field experiment of pollination to investigate single flower pollen and the hybrid fruit-setting rates of different S genotype combinations,and used the way of style fluorescent microscopy to research the affinitive degree of different S-genotype pollination combinations.The results shows that:the fruit-setting rate of the same S-genotype pollination combination S1S6 × S1S6 was the lowest(2.67 ％),the pollen tube germinated late (8 hours after pollination),and grew slower,a few pollen tubes arrived style at base after 48 hours,the majority of pollen tubes arrived at 1/2-2/3 style and stopped to grow,so the degree of self-incompatibility was higher.The pollination combination S6S33 × S1S6 of half-similarity S-genotype had the higher fruit setting rate(8.09 ％),the pollen tube germinated late(a large amount germinated at 8-10 hours after pollination),and the speed of growth was moderate,80％ of the pollen tubes arrived at style base for 48 hours after pollination,so the degree of affinity was lower.The fruit-setting rate of the different S-genotype pollination combination S21S21 ×S1S6 was the highest (21.27％),the pollen tubes geminated early(a large a mount germinated for 4-8 hours after pollination),all the pollen tubes arrived at style base for 96 hours after pollination,so the degree of affinity was higher.
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