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时间:2020-05-22
《高温胁迫对金钻蔓绿绒耐热性的影响-论文.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、河北农业科学,2014,18(5):30—32JournalofHebeiAgriculturalSciences编辑杜晓东高同泪Inn胁删’迫]L!]_对金钻蔓绿绒耐热性的影响孑J、少兴,延祷(山西农业大学林学院,山西太谷030801)摘要:为了明确金钻蔓绿绒对高温环境的忍耐能力,以3~5个叶片的金钻蔓绿绒扦插苗为试材,以室温为对照,研究了高温(35、40和45℃)胁迫不同时间‘(8、16、24、32和40h)对金钻蔓绿绒叶片相对电导率和丙二醛含量的影响。结果表明:叶片相对电导率随胁迫温度的升高而逐渐降
2、低、随胁迫时间的延长而逐渐上升,其中35℃所有胁迫处理的叶片相对电导率均显著>其CK,胁迫温度升高后叶片相对电导率反而显著下降甚至与其CK差异不显著,说明高温胁迫导致叶片细胞膜受害程度加深,温度过高时细胞甚至解体而失去活性;丙二醛含量随胁迫温度的升高和胁迫时间的延长均持续增加,除35cI=胁迫8h处理的叶片丙二醛含量显著<其CK外,其他高温处理的丙二醛含量均显著>其CK。植物所处的环境温度越高、时间越长,其叶片细胞受到的生理伤害就明显越重,综合分析高温胁迫对叶片相对电导率和丙二醛含量的影响,认为金钻蔓绿绒
3、可以勉强忍耐35℃高温8h。关键词:金钻蔓绿绒;高温胁迫;耐热性;叶片;相对电导率;丙二醛含量中图分类号:$682.36文献标识码:A文章编号:1008—1631(2014)05-0030-03EfectofHighTemperatureStressontheHeatResistanceofDiamondphilodendronSUNShao—xing,YAOYan—tao(CollegeofForestry,ShanxiAgriculturalUniversity,Taigu030801,China)A
4、bstract:InordertoclarifytheenduranceofDiamondphilodendrontohightemperatureenvironment,usingcuttingseedlingsofDiamondphilodendronwith3—5bladesasthetestmaterial,theroomtemperatureascontrol,theeffectsofhightemperature(35,40and45oC)stressatdifferenttimes(8,16
5、,24,32and40h)ontherelativeconductivityandMDAcontentofDiamondphilodendronleaveswerestudied.Theresultsshowedthattheleafrelativeconductivitywasdecreasedgraduallywiththeelevationofstresstemperatureandincreasedgraduallywithprolongingofstresstime,theleafrelativ
6、econductivityofallstresstreatmentsat35oCweresignificantlyhigherthanthatofCK,whenthestresstemperaturerises,leafrelativeconductivitywassignificantlydecreasedorevenhadnosignificantdifferenceswithCK,itindicatedthathightemperaturestresscauseddeepenofcellmembra
7、nedamagedegree,whenthetemperatureistoohigh,cellwasdisintegratedandlostactivity.MDAcontentwasincreasedwiththeelevationofstresstemperatureandprolongingofstresstime,MDAcontentofleavesat35oC8hwassignificantlylowerthanthatofCK,andthatofotherhightemperaturetrea
8、tmentswasremarkablygreaterthanCK.Theplantenvironmenttemperatureishigher,thetimeislonger,thephysiologicalinjuryofitsleafcellsissignificantlymoreweight.Comprehensiveanalysisofeffectsofhightemperaturestressonleafrelati
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