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1、浙江林學(xué)院學(xué)報(bào)2009,26(5):652—655JournalofZhejiangForestryCollege高溫脅迫對(duì)高羊茅光合作用的影響朱瀾,李雪芹z,賈曉琳,王斌,金松恒(1.浙江林學(xué)院林業(yè)與生物技術(shù)學(xué)院,浙江I臨安311300;2.浙江林學(xué)院天目學(xué)院,浙江臨安311300)摘要:為了解高溫脅迫對(duì)高羊茅Fest“c。刪ndine8光舍作用的影響,以2個(gè)高羊茅品種為實(shí)驗(yàn)材料,研究高溫處理對(duì)高羊茅氣體交換、葉綠素?zé)晒獾挠绊懡Y(jié)果表明,高溫脅迫后,2個(gè)高羊茅品種的凈光合速率()均明顯下降,其中氣孔因素引起了獵狗5號(hào)的下降,但并不是
2、交戰(zhàn)2號(hào)下降的原因。高溫脅迫降低了光系統(tǒng)Ⅱ(PSⅡ)最大光化學(xué)量子效率(/)、PSⅡ反應(yīng)中心捕獲激發(fā)能效率(/)、光化學(xué)猝滅(q)和電子傳遞速率(R),且交戰(zhàn)2號(hào)的下降幅度較大。但高溫脅迫明顯增加了高羊茅的非光化學(xué)猝滅(qNP),-y.戰(zhàn)2號(hào)的qNP則略低于獵狗5號(hào)。2個(gè)高羊茅品種均可有效地耗散過(guò)剩的激發(fā)能.盡可能保護(hù)化合機(jī)構(gòu)免受高溫脅迫的影響。圖3參16關(guān)鍵詞:植物學(xué):高羊茅;高溫脅迫;光合作用中圖分類(lèi)號(hào):Q945.11:$688.4文獻(xiàn)標(biāo)志碼:A文章編號(hào):1000—5692(2009)05—0652—04Hightemperat
3、urestresswithphotosynthesisinFestucaarundinaceaZHULaD,LIXue—qin,JIAXiao—lin,WANGBin,JINSong—heng(1.SchoolO{ForestryandBiotechnology,ZhejiangForestryCollege,Lin’an311300,Zhejiang,China;2.TianmuCollege,ZhejiangForestryCollege,Lin’an311300,Zhejiang,China)Abstract:Touncove
4、rtheadaptationmechanismsofphotosynthesisforhightemperature,gasexchangeandchlorophyllfluorescenceofFestucaarundinaceacuhivars‘Crossfire2’and‘Houndog5’weretesteduDdercontrol(20oC)andhightemperaturestress(38℃)withfourreplicationsfornetphotosyntheticrate(),stomatalconducta
5、nce(G),intercellularCO2concentrations(G),maximumrateofphotochemicalquantum(/),efficiencyofexcitationenergycapturedbyPSII(F/F'),photochemicalquenching(qP),non—photochemicalquenching(qNP),andelectrontransportflow(研).Resultsshowedthatafterhightemperaturestress,Pninbothcuh
6、ivarssignificantlydecreased(尸<0.05),GandCidecreasedin‘Houndog5’.Gsslightlydecreased,andClevenincreasedin‘Crossfire2’FN
7、Fm,F(xiàn)N
8、Fm,qP,andRETsignificantlydecreased(P<0,05)inbothcuhivars;andgNPsignificantlyincreased(P<0。05).Thesere—suitsindicatedthatstomatalfactorsledtothed
9、ecreasein‘Houndog5’,but1301'1一stomatalfactorsledtothePndecreasein‘Crossfire2’,andthatbyeffectivelydissipatingextraexcitationenergy,arundi-naceacanprotectitsphotosyntheticmechanismfromhightemperaturestress.[Ch,3fig.16ref.]Keywords:botany;Festucaarundinacea;hightemperatu
10、restress;pholosynthesis高羊茅Festucaarundinacea是一種冷季型草坪草,它的最適生長(zhǎng)溫度是l5—25℃,適宜于寒冷潮濕和溫暖潮濕過(guò)渡帶生長(zhǎng)Ⅲ。高羊茅對(duì)高溫有一定的抵抗能力,高溫下,雖然葉片仍能保持顏