牡丹呼吸速率和内源激素含量变化与开花衰老的关系

 以牡丹品种‘洛阳红’和‘胡红’为材料，研究开花和衰老过程中花瓣内源激素水平与呼吸代谢的变化。结果表明，随着花朵的发育，‘洛阳红’和‘胡红’呼吸速率均呈现典型的跃变特征，高峰分别出现在盛开期和半开期。牡丹开花后表现出花瓣中可溶性蛋白质含量下降和花色素苷积累的生理特征。牡丹在开花、衰老过程中内源IAA、ZR和GA3含量降低，内源ABA含量上升，‘洛阳红’属于类似乙烯跃变型，‘胡红’属于类似乙烯末期上升型。结果提示，牡丹在开花和衰老过程中花瓣内源激素代谢失衡是导致花瓣衰老的重要原因。

Respiration Rate and Endogenous Hormone Levels in Relation to the Flower Development of Tree Peonies

Respiration rates and endogenous hormone levels were measured during florescence and senescence of Paeonia suffruticosa cultivars‘Luoyanghong’and‘Huhong’. The results showed that respiration rates of‘Luoyanghong’and‘Huhong’were characterized by a typical climacteric，exhibiting a peak of respiration rate at full-opening and middle-opening stage，respectively. It was found that a decline in the content of soluble proteins but an increase in anthocyanin in peony petals after opening. The contents of endogenous IAA，ZR and GA3 decreased，however，endogenous ABA accumulated in petal of peony during florescence and senescence. The change pattern of ethylene production in‘Luoyanghong’was like that of ethylene climacteric cut flower，while the change pattern of ethylene emission in‘Huhong’was like increase during later stage. The data suggest that senescence of peony petal can be attributed to metabolic unbalance of endogenous hormone levels during florescence and senescence.