打顶对棉花赘芽生长的影响及其激素调控-论文.pdf

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1、棉花学报Co~onScience2014，26(4)：295～300打顶对棉花赘芽生长的影响及其激素调控祁虹，王永强，赵俊丽，郭娴，王树林，张谦，冯国艺，林永增，张寒霜(河北省农林科学院棉花研究所／农业部黄淮海半干旱区棉花生物学与遗传育种重点实验室．河北石家庄050051)摘要：以赘芽生长势强的冀151和269系及赘芽生长势弱的冀棉169和182系作为材料，观察打顶(D)、打顶+顶施IAA(D+T)和打顶+果枝顶芽施用IAA(D+F)处理下赘芽的生长势以及内源Z+ZR与IAA含量的变化结果显示，棉花上部赘芽在打顶20d后显著伸长，内源Z+

2、ZR水平在打顶6h后也明显提高，IAA水平显著下降；而D+T和D+F处理的棉花上部赘芽的伸长及内源Z+ZR水平的提高幅度均明显低于D处理．IAA含量则无显著变化。表明棉花茎节处合成的CTK促进赘芽生长，其水平受茎中由上而下IAA流的控制。棉花赘芽的生长既受主茎中IAA流调控，也受果枝中IAA流的影响关键词：棉花；赘芽；打顶；激素；调控机制中图分类号：A文献标志码：A文章编号：1002—7807f2014)04—0295—06EfectsofDecapitatingonCottonRedundantVegetativeShootsGrowt

3、handHormonalRegulationMechanismQiHong，WangYongqiang，ZhaoJunli，GuoXian，WangShulin，ZhangQian，FengGuoyi，LinYongzeng，ZhangHanshuang(CottonResearchInstitute,HebeiAcademyofAgriculturalandForestry．Sciences／KeyLaboratoryofBiologyandGeneticlm—provementofCotoninHuanghuaihaiSemiarid

4、Are&MinistryofAgriculture,Shijiazhuang050051，China)Abstract：Varieties(1ines)withs~ongergrowthvigorofredundantvegetativeshoots，Ji151and269line，andweakerones，Jimi-an169and182line，weretreatedwithdecapitationfDtreatment)，decapitation+stumpapplicationoflAAinlanolinfD+Ttreat—me

5、nt)anddecapitation+applicationofAinlanolinontopsoffruitbranches(D+Ftreatment)．Thegrowthofredundantvege—tativeshootsaswellasconcentrationsofendogenesisZ+ZRandIAAwereinvestigated．Itwasshownthatredundantvegetativeshootsonuppernodessignificantlyelongatedin20daysafterbeingdeca

6、pitated．alsoincreasingZ+ZRlevelanddecreasingLAlevelweredetectedat6hafterdecapitation．ButinD+TandD+Ftreatments，thetotallengthofredundantvegetativeshootsandendogenesisZ+ZRlevelswereobservablylowerthanthoseinDtreatments，respectively，andtheIAAconcentrationswereequaltothatbefo

7、rebeingdecapitated．Theseindicatedthat，thegrowthofredundantvegetativeshootswaspromotedbyCTKsynthe-sizinginnodes，whoseconcentrationwascontrolledbybasipetalIAAflowbothinthemainstemandinthefruitbranches．ICeywords：cotton；redundantvegetativeshoots；decapitating；hormones；regulati

8、onmechanism棉花赘芽由一级腋芽(果枝或叶枝)叶腋内响棉田的通风透光条件，增加蕾铃脱落率．对产的分生组织分化发育而来，是一级腋芽先出叶的量的形成极为不利[2】。因此赘芽生长势的强弱，是