外源GA3对油茶花器官内源激素与坐果率的影响  

Effects of Exogenous GA3 on Endogenous Hormones and Fruit Setting Rate of Camellia oleifera

作　　者：葛晓宁 钟秋平[1] 罗帅 曹林青[1] 郭红艳[1] 袁婷婷[1] 周幼成 GE Xiao-ning;ZHONG Qiu-ping;LUO Shuai;CAO Lin-qing;GUO Hong-yan;YUAN Ting-ting;ZHOU You-cheng(Experimental Center for Subtropical Forestry,Chinese Academy of Forestry,Fenyi 336600,Jiangxi,China)

机构地区：[1]中国林业科学研究院亚热带林业实验中心,江西分宜336600

出　　处：《林业科学研究》2020年第1期162-170,共9页Forest Research

基　　金：中央级公益性科研院所基本科研业务费专项资金项目“油茶早花种质资源收集与创新”(CAFYBB2017MB021)。

摘　　要：[目的]研究不同浓度外源GA3对油茶开花过程中花器官内源激素及坐果率的影响,分析油茶花器官内源激素与坐果率的相关性,探究促进油茶坐果的最佳外源GA3浓度,为油茶高产栽培和科学管理提供技术依据。[方法]以9年生‘长林4号’油茶为试验材料,采用单因素试验设计,对植株叶面分别喷施100、200、300、400、500mg·L^-1外源GA3,以喷施清水为对照(CK),分析不同浓度外源GA3对油茶花器官内源激素及坐果率的影响。[结果]研究表明:在试验水平范围内,喷施低浓度外源GA3有利于提高油茶坐果率,最佳喷施浓度为66.69mg·L^-1喷施低浓度的外源GA3使油茶雌蕊内源ABA含量降低,雄蕊ABA含量先升高后降低;雌雄蕊ZR、GA3含量升高,雌雄蕊IAA含量先降低后升髙;初萎时期雌蕊ABA与坐果率呈显著负相关(P<0.05)。[结论]在试验水平范围内,提高油茶坐果率的外源GA3最佳喷施浓度为66.69 mg·L^-1,喷施低浓度外源GA3可能通过调节油茶花器官内源ZR、IAA、ABA、GA3含量来影响其ABA含量,进而影响油茶坐果率。[Objective]To study the effect of exogenous GA3 concentrations on endogenous hormones of flower organ and fruit setting rate of Camellia oleifera,to analyze the correlation between endogenous hormones of flower organ and fruit setting rate of C.oleifera and to find the best exogenous GA3 concentration for promoting the fruit setting rate of C.oleifera.[Method]By using single factor test design,9-year-old C.oleifera‘Changlin-4'was used as test material,100,200,300,400 and 500 mg·L^-1 GA3 were sprayed on the leaves of C.oleifera,and fresh water was served as control and sprayed in order to observe the effects of different concentrations of exogenous GA3 on the endogenous honnones and fruit setting rate of C.oleifera.[Result]Spraying low concentrations of exogenous GA3 in the test level was conducive to improving the fruit setting rate of C.oleifera.The optimal spraying concentration of exogenous GA3 for improving the fruit-tea setting rate was 66.69 mg·L^-1.Spraying low concentration of exogenous GA3 reduced the ABA content of the pistil of C.oleifera,increased the content of ZR and GA3 of the pistil of C.oleifera.IAA content of the pistil of C.oleifera decreased at first and then increased.The content of endogenous ABA in the stamens increased at first and then decreased,the content of ZR and GA3 increased,and the content of IAA decreased at first and then increased by spraying low concentration of exogenous GA3.There was a significant negative correlation between pistillary ABA and fruit setting rate in the initial wilting stage(P<0.05),[Conclusion]In the test level range,the optimal spraying concentration of exogenous GA3 for improving the fruit setting rate of C.oleifera is 66.69 mg·L^-1.To control the content of endogenous ABA,ZR,IAA,GA3 of flower organ of C.oleifera and regulate the content of ABA by spraying different concentrations of GA3 stretches out an arm in improving the fruit setting rate of C.oleifera.

关 键 词：油茶 GA3 坐果率 内源激素 

分 类 号：S794.4[农业科学—林木遗传育种]