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1、維普資訊http://www.cqvip.com中國農(nóng)業(yè)科學2006,39(5):952—959ScientiaAzriculturaSinica低溫脅迫下鉬對冬小麥抗氧化酶活性的影響孫學成,譚啟玲,胡承孝,甘巧巧,易長城(華中農(nóng)業(yè)大學微量元素研究中心,武漢430070)摘要:【目的】揭示鉬提高冬小麥抗寒力的生理機制?!痉椒ā坎捎门柙栽囼灥姆椒ǎ远←溿f高效品種97003和鉬低效品種97014為材料,研究了在低溫脅迫下施鉬對冬小麥葉片抗氧化酶活性影響?!窘Y(jié)果】低溫處理2、4和6d時施鉬均顯著提高了超氧化
2、物歧化酶(SOD)、過氧化氫酶(CAT)、過氧化物酶(POD)和抗壞血酸過氧化物酶(APX)活性,顯著降低了2個冬小麥品種葉片中超氧陰離子產(chǎn)生速率;施鉬后,隨著低溫脅迫時間的延長,2個冬小麥品種葉片中4種抗氧化酶活性均先升高而后呈下降或突降趨勢,說明施鉬能使冬小麥通過正常的低溫鍛煉過程,有利于植株在經(jīng)受更長時間低溫脅迫時維持較高的抗寒力;鉬對冬小麥鉬高、低效品種葉片中抗氧化酶活性的影響存在基因型差異,與鉬高效品種相比,鉬低效品種缺鉬處理葉片SOD、CAT、POD和APX等抗氧化酶活性下降幅度更大,活性氧自
3、由基積累速率更大,這可能是鉬低效品種在缺鉬條件下更易受到低溫傷害的原因之一。【結(jié)論】鉬通過調(diào)控活性氧代謝過程來影響冬小麥的抗寒力。關(guān)鍵詞:鉬;冬小麥;低溫脅迫;超氧化物歧化酶(SOD);過氧化氫酶(CAT);過氧化物酶(POD);抗壞血酸過氧化物酶(APX)EfectsofMolybdenumonAntioxidativeEnzymesinWinterWheatUnderLowTemperatureStressSUNXue—cheng,TANQi—ling,HUCheng—xiao,GANQiao—qia
4、o,YIChang—cheng(MicroelementResearchCenter,HuazhongAgriculturalUniversity,Wuhan430070)Abstract:[Objective]Molybdenumisoneoftheessentialmicronutrientsforplants.Thepresentstudywasdesignatedtoexplorethephysiologicalmechanismofcoldresistanceenhancedbymolybden
5、uminwinterwheat.[Method]ApotexperimentWasconductedtoinvestigatetheeffectsofmolybdenumonantioxidativeenzymesinwinterwheat(MoeficientCV.97003andMoineficientCV.97014)underlowtemperaturestress.[Result]Theactivitiesofsuperoxidedismutase(SOD),catalase(CAT),pero
6、xidase(POD)andascorbateperoxidase(APX)increasedandtheproductionratesoffreeradicalsdecreasedinMo—treatedwinterwheatunderlowtemperaturestress.InMo—treatedwinterwheat,withtheprolongationoflowtemperaturestress,theactivitiesofthefourantioxidativeenzymesincreas
7、edatfirst2or4daysoflowtemperaturestress,andthendecreasedordroppeddrastically.ThetendencyintheactivitiesoftheseantioxidativeenzymesindicatedthatavalidcoldaccfirnationexperiencedintheMo—treatedwinterwheatandthatmolybdenumhelpedtomaintainthehigherlevelofcold
8、resistanceunderthefollowingdurativelowtemperaturestress.GenotypicdifferencesinresponseofactivitiesofmolybdenumonantioxidativeenzymeswerefoundinMoeficientCV.97o03andMoinemcientCV.97014.ThedecreaseratesoftheS0D.CAT,P0