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以扬麦 158为材料研究了小麦小花发育与退化两极分化过程中可孕花与不孕花的内源植物激素、可溶性糖和蛋白质含量的变化动态。不孕花在开花前 18天可溶性蛋白质含量即开始迅速下降 ,开花前 14天其鲜重和果聚糖含量也开始出现明显下降 ,表明已进入生理功能衰退期。在两极分化期间可孕花与不孕花在内源植物激素水平上表现出了截然不同的变化动态。可孕花的 ABA和 GA1+3含量随其发育逐步下降 ,IAA含量则稳定地维持在较低的水平上 ,因而其激素之间的比值也极为稳定 ;而不孕花的 IAA含量在开始退化时处在较高的水平上 ,ABA含量则随着小花的退化而逐步上升 ,且 IAA/ABA、 GA/ ABA和 i PA/ ABA的比值在退化开始时均出现大幅度的下降。结果表明 ,不孕花中较高的IAA含量及 IAA/ ABA、GA/ ABA和 i PA/ ABA比值的剧烈下降可能是导致其退化的主要生理原因
Yangmai 158 was used to study the dynamic changes of endogenous phytohormones, soluble sugars and protein contents in fertile and sterile flowers during the process of floret development and degeneration of wheat. The content of soluble protein began to decrease rapidly in the first 18 days of flowering, and its fresh weight and fructan content began to decline significantly 14 days before flowering, indicating that it had entered a period of physiological function decline. During the period of polarization, fertile and infertile flowers show quite different dynamics of change in endogenous plant hormone levels. The content of ABA and GA1 + 3 in fertile flower gradually decreased with the development of IAA and the content of IAA remained stable at a low level, and the ratio of IAA to IAA was extremely stable. ABA content gradually increased with the degeneration of floret, and the ratio of IAA / ABA, GA / ABA and i PA / ABA decreased significantly at the beginning of degradation. The results showed that the higher IAA content in sterile flowers and the sharp decrease of IAA / ABA, GA / ABA and i PA / ABA ratios may be the main physiological reasons leading to their degeneration