摘要
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/
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.
出处
《作物学报》
CAS
CSCD
北大核心
2001年第4期447-452,共6页
Acta Agronomica Sinica
基金
国家杰出青年科学基金项目
