外源GA3对两种杜鹃种子萌发特性的影响  

Effect of exogenous hormone GA3 on seed germination characteristics of two species of Rhododendron

作　　者：罗婵 邓毅晖 王熙富 刘宏 卢宗军 Luo Chan;Deng Yihui;Wang Xifu;Liu Hong;Lu Zongjun(Forestry Research Institute of Liuzhou,Liuzhou Guangxi 545300,China)

机构地区：[1]柳州市林业科学研究所,广西柳州545300

出　　处：《南方林业科学》2023年第4期27-30,共4页South China Forestry Science

基　　金：广西自筹经费林业科技项目(桂林科研[2022ZC]第5号);2022年柳州市森林植被恢复费项目“原生杜鹃繁育与引种栽培研究”。

摘　　要：以广西壮族自治区元宝山地区的稀果杜鹃、心基杜鹃种子为试验材料,研究不同浓度外源激素GA_(3)浸种处理对两种杜鹃种子萌发特性的影响。结果表明,经过不同浓度外源激素GA_(3)浸种处理后,两种供试杜鹃种子的萌发特性较未经外源激素浸种的对照组有明显变化,萌发时滞和发芽持续时间缩短且萌发高峰期提前,发芽率、发芽势和发芽指数均有不同程度提高。稀果杜鹃种子以800 mg·L^(-1)的GA_(3)浸种效果最好。心基杜鹃种子以800 mg·L^(-1)的GA_(3)浸种时,发芽率和发芽指数最高,以400 mg·L^(-1)的GA_(3)浸种时,发芽势最高。因此,采用GA_(3)浸种处理可有效改善两种杜鹃种子在自然条件下萌发效果不理想的情况。The seeds of Rhododendron oligocarpum and Rh.orbiculare subsp.cardiobasis collected from Yuanbaoshan area of the Guangxi Zhuang Autonomous Region were used as study meterrials to explore the effects of different concentrations of exogenous hormones GA_(3) on the germination of two species and soaked the species of the test Rhododendron in GA_(3) with different concentrations,furthermore,germination characteristic of them have been determined.The results showed that after treatment with different concentrations of exogenous hormone GA_(3),the germination characteristics of the two species of the test Rhododendron were significantly changed compared with the control group without exogenous hormone immersion,and the germination time lag and germination duration were shortened and the germination peak period was advanced.The germination rate,germination potential and germination index were improved to varying degrees.Germination indicators of the seeds of Rh.oligocarpum were relatively higher when treated with 800 mg·L^(-1).Rh.orbiculare subsp.cardiobasis species showed the highest germination rate and germination index when treated with 800 mg·L^(-1) and the highest germination potential when treated with 400 mg·L^(-1).Therefore,the use of GA_(3) soaking treatment can effectively improve the poor germination of two species of Rhododendron under natural conditions.

关 键 词：稀果杜鹃 心基杜鹃 GA3 萌发特性 发芽时间 

分 类 号：S685.21[农业科学—观赏园艺]