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1、棉花学报CottonScience2015袁27渊4冤院362―371乙烯抑制剂对钾缺乏棉花根系生长和侧根形成的影响*张志勇袁张新袁王素芳袁卜晶晶渊河南科技学院/河南省现代生物育种协同创新中心袁河南新乡453003冤摘要院水培条件下袁通过用乙烯前体1-氨基环丙烷基羧酸渊ACC冤和乙烯抑制剂氨氧基乙酸渊AOA冤尧Co2+和Ag+分别处理棉花幼苗根系和叶片袁研究其对钾缺乏棉花根系伸长和侧根形成的影响袁探讨钾缺乏棉花根系伸长和侧根形成与乙烯生成增加之间的关系遥结果显示袁钾充分营养液中袁添加ACC显著抑制了棉花根系伸长和侧根形成遥钾缺乏营养液中
2、袁添加ACC加重了对根系伸长和侧根发生的抑制曰添加AOA和Ag+分别显著降低了根系长度和侧根数曰添加Co2+显著提高了根系长度袁但其高浓度显著减少了侧根数遥由此可见袁钾缺乏诱导乙烯释放增加或许是根系伸长受抑制的原因遥钾缺乏条件下Co2+处理叶片显著增加了叶面积尧根系长度和侧根数袁这表明改善叶片生长可积极调节根系生长和发育遥关键词院1-氨基环丙烷基羧酸渊ACC冤曰Co2+曰根系伸长曰侧根形成曰叶面积中图分类号院S562.01文献标志码院A文章编号院1002-7807(2015冤04-0362-1010.11963/issn.1002-78
3、07.201504009*ZhangZhiyong,ZhangXin,WangSufang,BuJingjing(453003,)Therelationshipsbetweenincreasedethylenelevelsinducedbypotassiumdeficiencyandtheinhibitionofrootelon-gatingandbranchingofcotton,wereinvestigatedbytreatingrootsandleavesofcottonseedlingsinhydroponicculturesc
4、ontain-ingethyleneprecursorACC(1-aminocyclopropane-1-carboxylicacid)andethyleneinhibitorsAOA(aminooxyaceticacid),Co2+andAg+,respectively.TheadditionofACCtoK+-richculturemediumsimulatedtheeffectsofKdeficiencyonrootgrowthandbranching,andaggravatedtheeffectsofKdeficiencyinK
5、+-poorculturemedium.Incontrast,treatmentwithhighconcentrationsoftheethylenesynthesisinhibitorAOAdecreasedprimaryrootlength(PRL),lateralrootlength(LRL),andlateralrootnumber(LRN)underlowKconditions,andthiswassimilarfortheethyleneactioninhibitorAg+.TreatmentwithCo2+underlow
6、Kcon-ditionssignificantlyincreasedLRLand,athighconcentrations,PRL,butcausedreducedLRNathighconcentrations.Ourre-sultsindicatedincreasedethylenelevelsinducedbyKdeficiencymightaccountforinhibitionofrootelongation,butnotforthesuppressionofrootbranching.LeafapplicationofCo2+
7、enhancedleafarea,rootgrowth(PRLandLRL),andbranching(LRN)ofcottonseedlingsgrownunderlowKcondition,thoughtheeffectsofdifferentCo2+concentrationswerenotsignificant.Thesefindingssuggestthatimprovingleafgrowthmightpositivelyregulaterootmorphology.ACC;Co2+;rootelongation;later
8、alrootformation;leafareaS562.01A1002-7807(2015冤04-0362-1010.11963/issn.1002-7807.201504009[1]Inplants,t
