对花粉离体培养和花粉在雌蕊柱头上萌发、生长的研究发现 ,同源四倍体西瓜自交 ,花粉萌发率低 ,花粉管在花柱中生长缓慢 ,在花粉萌发和生长过程中伴随出现结节状、花粉管尖端膨大呈球形花粉管及双花粉管等异常现象。经对内源激素测定分析表明 ,上述现象与四倍体西瓜雌蕊和花粉中细胞分裂素———玉米素核苷 (ZR)含量过高、雌蕊的IAA和GA3与ABA的比值低、及花粉和雌蕊共同作用有关 In vitro culture of pollen and germination and growth of pollen on the stigma of pollen, we found that autotetraploid watermelon self-pollination, pollen germination rate is low, pollen tube grows slowly in the style, accompanied by knot formation in pollen germination and growth Nodular, pollen tube tip was spherical pollen tube and double pollen tube and other anomalies. The analysis of endogenous hormones showed that the above phenomenon was related to the high content of cytokinin-zeatin riboside (ZR) in pistil and pollen of tetraploid watermelon, the low ratio of IAA and GA3 to ABA in pistil, And the pistil joint effect