【摘要】 通过在诱花和诱芽培养基之间转换培养,发现黄瓜去顶苗花分化临界期是培养后的第5至6天(即去顶后的3至4天).对花芽分化初期子叶节中内源激素质量分数的测定表明,IAA质量分数在花芽分化初期处于较低水平,ZT质量分数呈下降趋势,GA3质量分数则出现升-降-升的波动状态.ZT/IAA、GA3/IAA比值的变化趋势相似,0至2天上升,2至3天下降,3至4天再上升.根据实验结果,联系黄瓜去顶苗成花的形态变化过程,对激素质量分数变化与花芽分化之间的关系进行了讨论.更多还原

【Abstract】 Through the inter-transferring with flower-induction and vegetative bud-induction medium, the critical period of floral differentiation in the decapitated seedlings of cucumber was founded to be the 5⁶ th day after culture （3⁴ th day after decapitation）. The results of changes of endogenous hormone contents at early stage of floral differentiation in cotyledonary nodes of cucumber seedlings after decapitation were as follows: The contents of IAA and ZT in cotyledonary nodes of the cucumber seedlings within 0⁴ d after decapitation decreases while the level of GA₃ first increases then declines within 1³ d, after that it increases again. The ratio of ZT/IAA increases within 0² d and drops rapidly on the 3 rd day, then goes up to the peak on the 4 th day. The change of GA₃/IAA ratio is similar as ZT/IAA. Based on these results, the relationship between these physiological changes and the floral bud differentiation was discussed.更多还原