外施生长素对陆生型空心莲子草不定根生长发育的影响  

Effect of exogenous auxin on root growth and development of terrestrial alligator weed

作　　者：芦旭然 杨霞 陈中义[1] LU Xuran;YANG Xia;CHEN Zhongyi(Institute of Plant Ecology andEnvironmental Restoration, Yangtze University, Jingzhou 434025, Hubei, China)

机构地区：[1]长江大学园艺园林学院长江大学植物生态与环境修复研究所,湖北荆州434025

出　　处：《草业科学》2018年第12期2951-2959,共9页Pratacultural Science

基　　金：湖北省自然科学基金(2013CFB391);长江大学大学生创新计划项目(2016126)

摘　　要：空心莲子草(Alternanthera philoxeroides)是一种水陆两栖的外来入侵植物,陆生型空心莲子草不定根膨大形成的贮藏根是其越冬、繁殖和扩散的重要基础。研究发现,根系中内源生长素(IAA)在不定根膨大过程中可能发挥了重要的调节作用。本研究利用不同浓度(10、50和100mg·L-1)的外源IAA对盆栽空心莲子草进行叶面喷施处理,探究IAA对于空心莲子草根系生长发育的作用机制。结果表明,外源生长素有利于促进空心莲子草贮藏根的形成,100mg·L-1 IAA处理促进效果最好。其作用机理可能在于IAA影响了空心莲子草根内蔗糖代谢相关酶活性及内源激素含量,促进根内营养物质合成,为根系膨大发育提供充足养分。Alternanthera philoxeroides is an amphibious alien invasive plant.The storage root formed by adventitious root expansion of terrestrial alligator weed is an important basis for wintering,reproduction,and spread.Studies have found that endogenous auxin(IAA)in the root system may play an important regulatory role in the process of adventitious root expansion.In this study,different concentrations of exogenous IAA(10,50,and100mg·L^-1)were used to spray potted alligator weed to explore the mechanism of IAA on root growth and development of alligator weed.The results showed that exogenous IAA was beneficial in promoting the formation of storage roots of alligator weed,and the best effect was observed for100mg·L^-1IAA treatment.The possible mechanism of action may be that IAA affects the activity of sucrose metabolism-related enzymes and endogenous hormones in the roots of alligator weed,promotes the synthesis of nutrients in roots,and provides sufficient nutrients for root expansion.

关 键 词：空心莲子草 外源生长素 不定根膨大 贮藏根 蔗糖 蔗糖合成酶 内源激素 

分 类 号：S482.8[农业科学—农药学] Q945.12[农业科学—植物保护]