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在棉纤维分化和发育的几个重要阶段测定胚珠及纤维中生长素（ＩＡＡ）、赤霉素（ＧＡ３）和细胞分裂素（ＺＲｓ）３类内源激素的含量。结果发现：开花前３天（即棉纤维细胞起始时期）ＩＡＡ和ＺＲｓ的含量相当高；花后５～１５天（即纤维伸长高峰期）ＧＡ３的含量处于快速增长期；花后１５～３５天（即次生细胞壁加厚期）ＩＡＡ的含量呈直线上升趋势，胚珠中各内源激素的含量显著高于纤维中的含量。由此可知，棉纤维的分化需要生长素和细胞分裂素的共同作用；ＧＡ３促进纤维的伸长，ＺＲｓ抑制纤维的伸长；促进纤维次生壁形成的重要因素是ＩＡＡ。
The levels of three endogenous hormones, IAA, GA3 and ZRs, in ovules and fibers were determined during several important stages of cotton fiber differentiation and development. The results showed that the content of IAA and ZRs in the first three days before flowering (ie, the initial period of cotton fiber cells) was very high. The content of GA3 in the first 5 to 15 days after flowering (the peak of fiber elongation) The content of IAA in the 35 days (ie secondary cell wall thickening) showed a linear upward trend, and the content of endogenous hormones in the ovule was significantly higher than that in the fiber. It can be seen that the differentiation of cotton fiber requires the combined action of auxin and cytokinin; GA3 promotes the elongation of fiber and ZRs inhibits the elongation of fiber; and the important factor that promotes the formation of secondary wall of fiber is IAA.