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当前位置: 首页 > 文章 > 覆盖栽培早竹开花的激素机制研究 林业科学 2007,43 (7) 10-15
Position: Home > Articles > Hormonal Regulation Mechanism of Flowering of Phyllostachys violascens under Mulching Cultivation Scientia Silvae Sinicae 2007,43 (7) 10-15

覆盖栽培早竹开花的激素机制研究

作  者：
丁兴萃
单  位：
国家林业局竹子研究开发中心
关键词：
早竹;花芽分化;内源激素;调控机制
摘  要：
根据早竹长势、竹叶大小与颜色和经验选择5类竹子分别代表竹子开花的不同阶段,后根据田间挂牌观察确定对应样品测定花芽分化各个时期竹叶、竹鞭iPA、Zr、ABA、IAA和GA35种内源激素动态变化。依据研究结果,将早竹花芽分化划分为3个时期,即“花芽诱导期”、“花芽的发端期”和“花芽形态建成期”。促进花芽生理分化的细胞分裂素主要是iPA,不是Zr;GA3和ABA一样,在花芽生理分化期是抑花激素,在花芽形态建成期则是促花激素;而IAA在整个花芽生理分化和形态分化期均为促花激素。竹子花芽分化生理生化触动是通过iPA/ABA,iPA/GA32个激素比值调控进行的,即其比值上升到一定水平时,花芽诱导即启动,而且iPA/ABA比值变化对花芽诱导启动作用比iPA/GA3作用更强。5种激素竹叶/竹鞭比值1.2~11.3,特别iPA比值在“花芽诱导期”高达11.3,竹叶高含量的激素主要在竹叶内部形成,而不是从鞭/根形成运输所致;竹叶是感受开花信号启动开花程序的器官,对竹子花芽分化发挥作用,而竹鞭不是感受开花信号启动开花程序的器官,对竹子花芽分化没有发挥作用。
译  名：
Hormonal Regulation Mechanism of Flowering of Phyllostachys violascens under Mulching Cultivation
作  者：
Ding Xingcui(China National Bamboo Research Center Hangzhou 310012)
关键词：
Phyllostachys violascens; endogenous hormone; flower bud differentiation; regulation mechanism
摘  要：
Five kinds of experimental bamboo (Phyllostachys violascens) plants representing different flower bud differentiation stages were selected based on whole bamboo growth vigour, leaf colour and size, and farmers's cultivation experiences. Collected bamboo samples marked in the field which are supposed to have flower would be identified by later field observation, analysis and determination of bamboo rhizome and leaf in different flower bud differentiation stages on the dynamic change of 5 kinds of endogenous phytohormones of iPA、Zr、ABA、IAA and GA_3,flower bud differentiation of P. violascens could be divided into 3 stages, i.e. flower-bud induction, flower-bud initiation, and flower-bud development. CTK promoting P. violascens flower bud differentiation was iPA, rather than Zr. GA_3 was acted as a promoter during its physiological and biochemical differentiation stage, but a inhibitor during its flower-bud development stage. ABA role was the same as GA_3, but IAA is different with ABA and GA_3, IAA was behaviored as a promoter during all the flower bud differentiation stage. The start-up of bamboo physiological and biochemical differentiation was trigged by change of ratio of iPA to ABA and iPA to GA_3, i.e. bamboo flower induction was initiated once their ratio value reached a certain level. iPA/ABA role was much bigger than iPA/GA_3 in regulation and control of flower bud differentiation. Ratio value of 5 kinds of phyto-hormones was ranged from 1.2 to 11.3, particularly iPA was peaked at 11.3 during bamboo bud induction stage. High content hormones was produced inside bamboo leaves, not from production and transportation of rhizome and root; bamboo leaves were supposed as the sensor of receiving flowering signal to trig flowering procedure which played important role in bamboo flowering, but bamboo rhizome was not such a organ as bamboo leaves, therefore it did not play role in bamboo flowering.

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