摘要： 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。

关键词: 同源四倍体西瓜, 花粉, 雌蕊, 内源激素

Abstract: By the research of in-vitro culture of pollens, and by the germination and growth of pollens on the styles, the results were that: 1. The germination ratio of pollen of autotetraploid watermelon was low by self-pollination;2. The growth of the pollen tubes in styles was slow;3. During the germination and growth of pollens, there were some abnormal phenomenon: the blinding of pollen tubes, the swelling as balls at the topes of pollen tubes, and two-tube from one pollen. By the determinations of endogenous hormones, the reasons of above abnormal phenomenon were explained as: 1. The content of zeatin-nucleoside in the female organs and pollens of autotetraploid watermelon was too high;2. The ratio of auxins (IAA and GA3) to growth inhibitor(ABA)was low;3. The results also affected by the reaction between pollens and styles.

Key words: Autotetraploid watermelon, Pollen, Female organ, Endogenous-hormone