棉花苗期到盛花期倒四叶激素变化研究初报

Changes of hormones in the top fourth leaf of cotton during seedling to full flowering stage

研究苗期到盛花期棉花倒四叶的内源激素变化情况,以及激素和棉花各生长部位相互关系。结果表明:IAA的含量随着棉花的生长呈现下降的趋势,进入盛花期后,IAA开始上升;CTK随着棉花的生长呈现上升的趋势;GA3在花铃期有下降的趋势,GA3和蕾中的GA3变化相反;ABA的高峰值和花芽中ABA的高峰值的出现有时间差。叶片中各激素比值在现蕾期与叶片中养分N、K的变化趋势有相似之处;与茎中N、K的变化存在时间差;在花铃期与营养器官中的N的变化趋势相似,和K的变化趋势相反。激素比值变化对各部位的P没有显著影响。

The experiment was conducted to study the changes of endogenesis hormones in the top fourth leaf of cotton during seedling to full flowering stage, and analyze the relationship between hormones and different positions. The results showed ： The content of IAA tended to be decreased in the early stage, but went up after the full flowering stage; The content of CTK presented the tendency of rising along with the growth of cotton; In flowering and boll developing stage, the content of GA3 tended to be dropped, and the variation trend of GA3 in leaves and in buds was opposite ; There was a time difference between the peak value of ABA in leaves and that in buds. In leaves, the change tendency of each hormone ratio was similar to that of nutrient N and K in the squaring stage ; In stems, there was a time difference between the change tendency of each hormone ratio and that of nutrient N and K; In flowering and boll stage, the change tendency of each hormone ratio was similar to that of N in nutritive organ, but was opposite to that of K. The content of P in cotton was not notably influenced bv the changes of hormone ratio.