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棉花主茎每一片叶子的叶腋里含有一个胶芽，按其发育方向可区分为叶芽和混合芽，前者发育成叶枝，后者则发育成果枝。主茎腋芽的发育方向有明显的分带习性，子叶节和基部1～3个节位的腋芽是潜伏状态，果枝始节以下3～5个节位属叶枝带，腋芽一经诱发即发育成叶枝，果枝始节以上
The main stem of cotton leaves each leaf axillary contains a plastic bud, according to their development can be divided into leaf buds and mixed buds, the former developed into leafy branches, while the latter developed fruit branches. Axillary buds of main stems have obvious zonation habits. Axillary buds of 1-3 cotyledons at cotyledonary node and basal are latent state. Branches of 3 ~ 5 nodes below the beginning of fruit branch are leafy branches. Once axillary buds are induced, axillary buds develop into leafy branches , Fruiting branches beginning above