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1、河北農(nóng)業(yè)科學(xué)，2014，18(5)：30—32JournalofHebeiAgriculturalSciences編輯杜曉東高同淚Inn脅刪’迫]L!]_對(duì)金鉆蔓綠絨耐熱性的影響孑J、少興，延禱(山西農(nóng)業(yè)大學(xué)林學(xué)院，山西太谷030801)摘要：為了明確金鉆蔓綠絨對(duì)高溫環(huán)境的忍耐能力，以3～5個(gè)葉片的金鉆蔓綠絨扦插苗為試材，以室溫為對(duì)照，研究了高溫(35、40和45℃)脅迫不同時(shí)間‘(8、16、24、32和40h)對(duì)金鉆蔓綠絨葉片相對(duì)電導(dǎo)率和丙二醛含量的影響。結(jié)果表明：葉片相對(duì)電導(dǎo)率隨脅迫溫度的升高而逐漸降
2、低、隨脅迫時(shí)間的延長(zhǎng)而逐漸上升，其中35℃所有脅迫處理的葉片相對(duì)電導(dǎo)率均顯著>其CK，脅迫溫度升高后葉片相對(duì)電導(dǎo)率反而顯著下降甚至與其CK差異不顯著，說明高溫脅迫導(dǎo)致葉片細(xì)胞膜受害程度加深，溫度過高時(shí)細(xì)胞甚至解體而失去活性；丙二醛含量隨脅迫溫度的升高和脅迫時(shí)間的延長(zhǎng)均持續(xù)增加，除35cI=脅迫8h處理的葉片丙二醛含量顯著<其CK外，其他高溫處理的丙二醛含量均顯著>其CK。植物所處的環(huán)境溫度越高、時(shí)間越長(zhǎng)，其葉片細(xì)胞受到的生理傷害就明顯越重，綜合分析高溫脅迫對(duì)葉片相對(duì)電導(dǎo)率和丙二醛含量的影響，認(rèn)為金鉆蔓綠絨
3、可以勉強(qiáng)忍耐35℃高溫8h。關(guān)鍵詞：金鉆蔓綠絨；高溫脅迫；耐熱性；葉片；相對(duì)電導(dǎo)率；丙二醛含量中圖分類號(hào)：$682．36文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：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
