大葱花芽分化过程中内源激素的变化  

Changes of Endogenous Hormones During the Process of Flower Bud Differentiation of Welsh Onion

作　　者：苏华[1] 徐坤[1] 刘伟[1] 

机构地区：[1]作物生物学国家重点实验室山东农业大学,山东泰安271018

出　　处：《园艺学报》2007年第3期671-676,共6页Acta Horticulturae Sinica

基　　金：国家‘948’项目(2003T-14)

摘　　要：为探讨激素与大葱花芽分化的关系,研究了不同大葱品种花芽分化过程中植株根、假茎及叶片内源激素的变化动态。结果表明,大葱植株根、假茎及叶片ABA、GA3、ZR的含量均在花芽分化基本完成时达到高峰,而IAA则至低谷,且内源激素出现高峰或低谷的时间,与不同品种花芽分化完成时间一致,表明测试激素均与花芽分化有密切关系。但不同器官内源激素含量高低及变化幅度显著不同,其中叶片ABA、GA3及根系ZR含量较高,且变化显著,而IAA在根系及叶片中的含量及变化幅度差异较小,但显著高于假茎。大葱叶片ABA/IAA、ABA/GA3均随花芽分化率的增加而显著升高,花芽分化完成时达峰值,之后迅速降低,说明叶片内源激素间的平衡关系,在大葱的花芽分化过程中亦起着重要的调控作用。Different Welsh onion （Alliumfistulosum L. ） varieties were used as materials to discuss the relation between endogenous hormones and flower bud differentiation. The results showed that during the process of flower bud differentiation, the contents of abscisic acid （ ABA）, gibberellin （ GA3 ） and zeatin （ZR） in the roots, cauloids and leaves of Welsh onion peaked but indolylacetic acid （IAA） decreased evidently when flower buds differentiation was basically completed, and the period of peak or valley of endogenous hormones appearing coincided with the time of flower bud differentiation completed, these indicating flower bud differentiation nearly connected with ABA, GA3, ZR and IAA. The contents and changing ranges of endogenous hormones in different organs of Welsh onion were significantly different, in which the contents and changing ranges of ABA, GA3 in leaves and ZR in roots were much more than that of the other organs, but there was a little difference for that of IAA in roots and leaves. Further, ABA/IAA and ABA/GA3 in Welsh onion leaves were obviously increasing along with the process of flower bud differentiation, and peaked when flower buds differentiation was basically completed, then decreased significantly, this illustrated the balance between different endogenous hormones also played an important role in regulating and controlling flower bud differentiation of Welsh onion.

关 键 词：大葱 花芽分化 越冬栽培 内源激素 

分 类 号：S663.1[农业科学—果树学] Q946.885[农业科学—园艺学]