小麦小花两极分化中内源植物激素与糖氮含量的变化特征

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

Changes of Endogenous Plant Hormones and Soluble Sugars and Proteins during Floret Development and Degeneration in Wheat

The changes of endogenous content of plant hormones and soluble sugars and proteins in fertile and infertile florets during the process of their development and degeneration were studied with wheat variety Yangmai 158. Soluble proteins in infertile florets began to decrease sharply on 18 days before anthesis, which indicates the beginning of floret degeneration. The fresh weight and the content of fructan and soluble sugars began to decrease sharply on 14 days before anthesis. The endogenous hormones showed the opposite changes between fertile and infertile florets. The fertile floret showed the steady decrease of ABA and GA 1 3 levels and lower level of IAA as it developed, as well as hormone balance. The infertile floret, however, showed the higher level of IAA and sharp decrease of IAA/ABA and GA 1 3 /ABA and iPA/ABA ratio at the beginning of its degeneration, and increase of ABA level as it degenerated. The results indicated that the higher level of IAA and sharp decrease of IAA/ABA and GA 1 3 /ABA and iPA/ABA ratio might be the main physiological reason of floret degeneration.