不同油菜品种内源激素水平的差异及其对催熟剂的响应

为了研究催熟剂对油菜内源激素的影响，以促进果粒的一致成熟和适应机械化收割，以4种不同熟期的油菜品种和复合催熟剂（0.5%乙烯利+0.3%敌草快）为材料，研究不同熟期油菜品种内源激素的差异及催熟剂对不同品种内源激素的影响。结果表明：成熟期不同品种油菜内源激素含量差异显著，早熟品种的乙烯、ABA含量高于晚熟品种，且高峰期出现较早，下降也较快；而IAA含量与乙烯、ABA含量相反。喷施催熟剂后，乙烯与ABA含量增加，IAA含量降低；角果皮中乙烯释放增加量显著大于籽粒，晚熟品种表现更持久，ABA含量的增加规律与之相反；角果皮与籽粒中IAA的下降幅度在不同品种间表现不同。推测催熟剂可以通过调节内源激素的释放量来促进油菜籽粒成熟。

The differences of endogenous hormones level and their response to ripener among the different rapeseed varieties

 To study the effects of ripener on endogenous hormones in rapeseed， and promote the shell and seeds unified maturity and meet mechanized harvesting, 4 rapeseed varieties with different maturity periods and compound ripener （0.5% ethephon + 0.3% diquat） were used to study the difference of endogenous hormones and the effects of ripener on endogenous hormones in 4 rapeseed varieties. It was found that during maturity period， the differences of endogenous hormones content in different rapeseed varieties were remarkable. The contents of ethylene and ABA in early maturing varieties were higher than those in late maturing varieties， the fastigium of them appeared earlier but fell faster. While the content of IAA showed contrary to ethylene and ABA. After spraying with ripener， the contents of ethylene and ABA raised while IAA decreased. The increment of ethylene in shell exceeded that in seeds dramatically， which lasted longer in late maturing varieties. The law of increasing of ABA content showed contrary to ethylene. The falling range of IAA content in shell and seeds were entirely different among different varieties. The results indicated that ripener could promote rape seed ripening by regulating the release of endogenous hormones.