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在油菜整个大田生长期间,分期镜检全株生长点的花原基分化。结果表明:茎级愈高,花芽分化开始愈迟,同一茎轴上,各分枝开始花芽分化的次序则因枝位而异。在本试验条件下,抽苔前的油菜,一、二级分枝花原基的分化速率较慢,分化数量较少,但主茎及其上部一、二级分枝在此时分化的花原基多数能开花结实。当油菜进入抽苔至开花期,各级花原基分化的速率最快,分化数量亦最多,但大多数均不能开花结实。因此,在长江下游的类似生态条件下,当油菜抽苔前适当促进花芽分化,并在抽苔期控制花芽的发生,对增加油菜产量可能具有重要的意义。
During the growth of the whole field of rapeseed, the flower primordium differentiation of the whole plant growth point was microscopically staged. The results showed that the higher the stem grade was, the later the floral bud differentiation began. The order of flower bud differentiation on the same stem axis was different for each branch. Under the experimental conditions, the rapeseed before bolting, the first and second grade flower primordium differentiation rate is slower, the number of differentiation is less, but the main stem and the upper part of the first and second branch at this time the flower The majority of primordia can flowering and fruiting. When rape entered the bolting and flowering stage, the rate of differentiation of flower primordium at all levels was the fastest and the number of differentiation was the most, but most of them did not flowering and fruiting. Therefore, under similar ecological conditions in the lower reaches of the Yangtze River, it may be of great significance to increase the yield of rape when rapeseed is appropriately promoted flower bud differentiation before bolting and control of flower buds during bolting period.