低温解除牡丹芽休眠进程中内源激素的变化  

Changes of Endogenous Hormones during Dormancy Release by Chilling in Tree Peony

作　　者：郑国生[1] 盖树鹏[1] 盖伟玲[2] 

机构地区：[1]青岛农业大学生命科学学院,青岛266109 [2]青岛农业大学植物科技学院,青岛266109

出　　处：《林业科学》2009年第2期48-52,共5页Scientia Silvae Sinicae

基　　金：山东省良种产业化项目(鲁科农字[2005]99号)

摘　　要：以4～5年生牡丹‘胡红’为试材,研究1～7周不同低温处理时间对其开花展叶的影响。根据花芽萌动和开花情况结合激素的变化动态,将低温解除花芽休眠进程划分为:低温累积期、休眠解除启动期、休眠基本解除期、休眠彻底解除期4个时期。分别测定低温处理期内和进入温室后内源GA3,ABA,CTK,IAA及其比值的变化。结果表明:低温期内GA3,ABA,CTK质量分数的增减和GA3/ABA比值的变化可明显地反映低温解除花芽休眠的进程。其中,GA3/ABA比值的变化与休眠的进程直接对应。进入温室后牡丹花芽内各激素的变化进一步证明GA3和CTK是解除休眠的促进物,ABA是解除休眠的抑制物。低温解除牡丹休眠是通过调节休眠解除的促进物和抑制物之间的平衡来实现的,是多因素综合作用的结果。Four or five year old potted plants of Paeonia suffroticosa ‘Huhong＇ were subjected to the chilling treatment for different durations （1-7 weeks） to investigate the chilling requirements for shoot flush and flower initiation. Chilling was followed by forcing for up to 8 weeks in greenhouse until flowering finished. Based on the effects of different chilling durations on germination and flowering and the plant hormones dynamics during the chilling treatment, the process of the chilling treatment were divided into four stages of chilling accumulation, dormancy switching release, dormancy basically release and dormancy entirely release. The dynamic variation of GA3 , ABA, CTK, IAA and their ratio in the buds were tested in every chilling treatment stage and after moved into greenhouse. The results demonstrated that GA3 and CTK induced, however ABA inhibited the dormancy release. The process of the release was well reflected in the change of the activators and inhibitor, among which the ratio of GA3 to ABA was directly related to the dormancy releasing progress. Finally, it was proposed that chilling treatment result in dormancy release probably through regulating the balance of activators and inhibitors existed in the buds, and the progress of dormancy release of the buds was a result of multi-factors regulation.

关 键 词：牡丹 内源激素 低温 休眠解除 

分 类 号：S718.43[农业科学—林学]