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烟株主茎具有一个顶端优势的主芽,后期顶端营养芽发育成为开花的繁殖芽.如果除去顶端营养芽或任其种籽穗发展,叶腋间的侧芽即开始生长.侧芽最初也是营养生长,然后也象顶生芽会形成繁殖芽.原因是烟株的顶芽中会产生一种抑制腋芽生长的激素.如果除去了顶芽,或任其种籽穗发展,抑制激素就被除去,而杈叶开始生长.初期上部3至4叶腋间的的杈叶发生,而这些杈叶的顶芽也会产生这种抑制激素.若除去这些杈枝和杈叶,沿着主茎往下的叶腋间的杈芽开始发生.每一主茎叶腋间有产生三个叉叶
The main stems of the tobacco plants have a top dominant bud, and the top vegetative bud develops into a flowering breeding bud at the later stage. If the top vegetative buds are removed or their spikes develop, the lateral buds of the leaf axils begin to grow. The lateral buds are also initially vegetative and then Also like the top buds will form breeding buds, because the top buds of tobacco plants produce a hormone that inhibits the growth of axillary buds, and if the top buds are removed or their spikes develop, the inhibitory hormones are removed, The leaves begin to grow, initially with 3 to 4 axillary axils of the upper leaves occurring, and the apical buds of these leaves also produce this inhibitory hormone.If these branches and leaves are removed, Of the twigs buds begin to take place. There are three forked leaves in the axilla of each main stem