Endogenous phytohormones and the expression of flowering genes synergistically induce flowering in loquat  

作　　者：CHI Zhuo-heng WANG Yong-qing DENG Qun-xian ZHANG Hui PAN Cui-ping YANG Zhi-wu 

机构地区：[1]College of Horticulture,Sichuan Agricultural University,Chengdu 611130,P.R.China [2]Sichuan Academy of Forestry,Chengdu 610081,P.R.China

出　　处：《Journal of Integrative Agriculture》2020年第9期2247-2256,共10页农业科学学报（英文版）

基　　金：This work was financially supported by the Key Research Project of Scie nee and Technology,Sichuan,China(2016NYZ0034).

摘　　要：Flowering is an important process for the reproduction of higher plants.Up to this point,the studies on flowering have mostly focused on the model plant Arabidopsis thaliana,and the flowering mechanism of fruit trees remains mostly unknown.The diversity of the flowering time of loquat(Eriobotrya japonica Lindl.)makes it an ideal material to study the regulation of flowering.In this study,we first observed the inflorescence bud differentiation in two varieties of loquat that had different blooming times(cv.Dawuxing(E.japonica),that blooms in the fall and cv.Chunhua(E.japonica×Eriobotrya bengalensis Hook.f.)that blooms in the spring)and found that the starting time of inflorescence bud differentiation and the speed of inflorescence development were responsible for the difference in blooming times.The determination of endogenous phytohormones by high performance liquid chromatography(HPLC)indicated that abscisic acid(ABA),zeatin(ZT),and gibberellin(GA3)promoted flowering in loquat,while indole-3-acetic acid(IAA)was mainly involved in inflorescence bud differentiation in Chunhua.A transcription level analysis illustrated that multiple flowering-related genes could respond to different signals,integrate to the TFL1,AP1 and FT genes,and then synergistically regulate flowering in loquat.Thus,this study provides a new insight into flowering regulation mechanisms in loquat.

关 键 词：LOQUAT inflorescence bud differentiation FLOWERING endogenous hormones gene expression 

分 类 号：S685.99[农业科学—观赏园艺]