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以赘芽生长势强的冀151和269系及赘芽生长势弱的冀棉169和182系作为材料,观察打顶(D)、打顶+顶施IAA(D+T)和打顶+果枝顶芽施用IAA(D+F)处理下赘芽的生长势以及内源Z+ZR与IAA含量的变化。结果显示,棉花上部赘芽在打顶20 d后显著伸长,内源Z+ZR水平在打顶6 h后也明显提高,IAA水平显著下降;而D+T和D+F处理的棉花上部赘芽的伸长及内源Z+ZR水平的提高幅度均明显低于D处理,IAA含量则无显著变化。表明棉花茎节处合成的CTK促进赘芽生长,其水平受茎中由上而下IAA流的控制。棉花赘芽的生长既受主茎中IAA流调控,也受果枝中IAA流的影响。
The effects of topping (D), topping + top dressing IAA (D + T) and topping + fruiting tops were observed in Ji 151 and 269 lines with strong growth of vegetative buds and Jiamian 169 and 182 lines with weak growth of vegetative buds. The growth potential and the changes of endogenous Z + ZR and IAA contents of buds under buds treated with IAA (D + F). The results showed that the upper buds of cotton grew significantly after 20 days, and the level of endogenous Z + ZR significantly increased after 6 h, with the IAA level declining significantly. However, the upper part of cotton with D + T and D + F treatments The elongation of vegetative buds and the increase of endogenous Z + ZR levels were significantly lower than those of D treatment, while IAA content did not change significantly. It is suggested that the CTK synthesized at the stalk node of cotton promotes the growth of vegetative buds and its level is controlled by the top-down IAA flow in the stem. The growth of buds of cotton is influenced by the IAA flow in the main stem and also by the IAA flow in the shoots.