蓝花丹二型花雌、雄蕊发育进程及内源激素对花柱生长的影响  

Development Process of Pistils and Stamens and Effect of Endogenous Hormone Content on Style Growth in Plumbago auriculata Lam. with Distyly

作　　者：闻金燕[1] 张硕[2] 高素萍[1,3] 雷霆[3] 罗良旭 罗雁[1] 

机构地区：[1]四川农业大学风景园林学院,成都611130 [2]成都师范学院化学与生命科学学院,成都611130 [3]四川农业大学园林研究所,成都611130

出　　处：《植物科学学报》2016年第2期263-270,共8页Plant Science Journal

基　　金：四川省科技支撑计划项目(2012FZ0083)~~

摘　　要：为了解二型花雌、雄蕊发育进程及内源激素对长、短花柱生长发育的影响,以蓝花丹（Plumbago auriculata Lam.）为材料,观察分析了长花柱（L型）、短花柱（S型）花朵内雌、雄蕊的发育特征,并分别检测了L、S型花柱中的内源激素水平。结果显示：蓝花丹雌、雄蕊发育进程基本符合逻辑斯蒂变化曲线,并可划分为5个时期,即T1初始发育期、T2转折期（一）、T3快速发育期、T4转折期（二）、T5平稳发育期;在整个发育进程中,L型花朵中雌蕊的生长速率始终高于雄蕊;S型花朵中雌蕊的生长速率在T3期由快转慢,导致T3~T5期雌蕊的生长速率始终低于雄蕊,从而形成了雌蕊低于雄蕊的短花柱特征。这说明花柱的分化是在二型花雌、雄蕊快速发育的T3期开始出现,并逐渐形成花柱异长植物最显著的花部形态特征。IAA、IPA和GA含量均在T1~T3期增加、T4~T5期降低,且在L型花柱中的含量始终高于S型,而ABA含量的变化趋势与这3种生长促进类激素相反,说明在蓝花丹花柱发育过程中,IAA、IPA和GA可能参与调控花柱的伸长生长,而ABA主要在发育后期促使花柱成熟。To research the development processes in Plumbago auriculata Lam.,a typical plant with distyly,the lengths of pistils and stamens and endogenous hormone levels in styles were measured. The development process of pistils and stamens could be divided into five developmental stages： inchoate development stage（ T1）,turning stage（ a）（ T2）,rapid development stage（ T3）,turning stage（ b）（ T4） and smooth development stage（ T5）.During the whole development process,the growth speed of pistils was always faster than thatof the stamens in long-styled flowers. The growth speed of pistils in short-styled flowers was faster than that of the stamens at T1- T2 stages,but slower at T3- T5 stages,which explains why short-styled flowers had shorter pistils. The differentiation between long- and short-styled flowers appeared at the T3- T5 stages,and led to the most obvious feature in flowers of plants with distyly. The contents of IAA,IPA and GA in long-styles were higher than those in shortstyles,and were all increased at the T1- T3 stages,but reduced in the T4- T5 stages. In contrast,ABA content was increased at the T4 stages. During style development in P.auriculata,IAA,IPA and GA appeared to have a positive influence on style development,but ABA had a negative influence.

关 键 词：内源激素 蓝花丹 二型花 发育进程 

分 类 号：Q945[生物学—植物学]