摘要
By determination of the change of endogenous hormone Zr,iPA,GA3,IAA and ABA during different flower bud differentiation stages of Phyllostachys praecox,which is identified through both field observation and lab analysis,and with the reference to the previous research achievements on bamboo flowering,the flowering mechanism assumption of Phyto-Hormone Regulation and Gene Activation of Ph.praecox is induced in this article:Bamboo flower bud differentiation can be divided into 3 stages,i.e.flower bud induction,flower bud initiation and flower bud development;Bamboo leaves sense and receive flowering signals from environments to change its hormone level,esp.ratios of iPA/ABA and iPA/GA3;Flowering gene is activated once the ratios of iPA/ABA and iPA/GA3 reach a proper threshold,and it produces DNA and RNA carrying flowering code and transports them to top or side buds nearby,and then protein necessary for flower bud differentiation comes out,as a result of which the flower bud induction is trigged and started,followed by flower bud initiation and development.In the induction stage,ratio of C/N is nearly constant,but increases in the initiation stage.Therefore it clarifies that the rising of C/N ratio does not bring about bamboo flowering initially,and it is a follow-up reactions of process initiation of bamboo flowering.It proves that bamboo rhizome is directly involved in the flower bud differentiation.This assumption can well explain mysterious phenomena of bamboo flowering,and by integrating the current several assumptions,answer the difficult and perplexing questions regarding bamboo flowering which have not been answered by the present assumptions.
By determination of the change of endogenous hormone Zr, iPA, GA3, IAA and ABA during different flower bud differentiation stages of Phyllostachys praecox, which is identified through both field observation and lab analysis, and with the reference to the previous research achievements on bamboo flowering, the flowering mechanism assumption of Phyto-Hormone Regulation and Gene Activation of Ph. praecox is induced in this article： Bamboo flower bud differentiation can be divided into 3 stages, i.e. flower bud induction, flower bud initiation and flower bud development; Bamboo leaves sense and receive flowering signals from environments to change its hormone level, esp. ratios of iPA/ABA and iPA/GA3; Flowering gene is activated once the ratios of iPA/ABA and iPA/GA3 reach a proper threshold, and it produces DNA and RNA carrying flowering code and transports them to top or side buds nearby, and then protein necessary for flower bud differentiation comes out, as a result of which the flower bud induction is trigged and started, followed by flower bud initiation and development. In the induction stage, ratio of C/N is nearly constant, but increases in the initiation stage. Therefore it clarifies that the rising of C/N ratio does not bring about bamboo flowering initially, and it is a follow-up reactions of process initiation of bamboo flowering. It proves that bamboo rhizome is directly involved in the flower bud differentiation. This assumption can well explain mysterious phenomena of bamboo flowering, and by integrating the current several assumptions, answer the difficult and perplexing questions regarding bamboo flowering which have not been answered by the present assumptions.
