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1、中廚蓉通報(bào)2014,30(16):22·29ChineseAgriculturalScienceBulletin金葉榆不同葉位葉片呈色生理機(jī)制研究王亞蕓,王立英,任建武,姚洪軍,沙海峰(北京林業(yè)大學(xué)生物科學(xué)與技術(shù)學(xué)院,北京100083;北京森淼種業(yè)有限公司,北京102211;北京市林業(yè)種子種苗管理總站,北京100029)摘要:通過(guò)測(cè)定金葉榆不同葉位葉片的色素含量和光合生理參數(shù),旨在研究其葉片的呈色生理機(jī)制。結(jié)果表明,葉綠素axb含量從頂梢向下逐漸升高,類(lèi)胡蘿卜素、花青素含量及色差參數(shù)、0、b值逐漸降低;凈光合作用速率顯著升高,葉位7以下的葉片高達(dá)12~molCO:/(m2
2、·s)以上,而頂梢葉位1沒(méi)有光合產(chǎn)物積累;單位面積進(jìn)入用于電子傳遞的量子產(chǎn)額ECs提高,光量子的熱耗散比率DIo/CS降低;最大光量子效率提高,葉位9以下的葉片F(xiàn)vlFm在0.8以上;葉位12、11的性能指數(shù)、光合驅(qū)動(dòng)力明顯高于上部的葉片,與對(duì)照白榆沒(méi)有明顯差異。試驗(yàn)發(fā)現(xiàn),金葉榆葉片色彩與類(lèi)胡蘿卜素含量成極顯著正相關(guān)關(guān)系,葉片色彩受光照條件和光合作用狀態(tài)調(diào)控,說(shuō)明金葉榆葉片色彩是一種生態(tài)表現(xiàn)型。關(guān)鍵詞:葉綠素;類(lèi)胡蘿卜素;花青素;光合作用;快速葉綠素?zé)晒庵袌D分類(lèi)號(hào):$687.2文獻(xiàn)標(biāo)志碼:A論文編號(hào):2013.318lTheStudyofColor。。emergingMe
3、chanismofLeavesatDiferentLeafPositionofi/Spumila‘Jinye’WangYayun,WangLiying,RenJianwu,YaoHongjun,ShaHai~ng(CollegeofBiologicalSciencesandBiotechnology,BengForestryUniversity,Beijing100083;TheBengSenmiaoSeedCo.Ltd.,Beijing102211;ForestrySeedManagementStation,Beijing100029)Abstract:Thisstud
4、yprobedthepigmentcontentandphotosyntheticphysiologicalparametersofleafbladesatdiferentleafpositionsonU/muspumila‘Jinye’,aimingatelucidatingcolor—emergingmechanismofleaves.Theresultsindicatedthatthecontentofchlorophyllaandbincreasedfromthetoptothebaseonthesamebranch,whilecarotenoids,anthoc
5、yaninandcolorparametersnamedL,a,bgraduallydecreased.Underthesamelightintensity,Intermsofphotosyntheticrate,leavesatthetopofbrancheshighersignificantlythanleavesinmiddlepartsandbasalpartsofbranches.Itwasnoticedthattherewasnoaccumulationofphotosyntheticproductsinthefirstbladefromtops,andpho
6、tosynthesisrateofseventhbladeinthemiddlepartofabranchwasashigllas12I~molCOJ(m·s).ETo/CSincreasedsignificantlyfromthefirstleaftotheseventhleaf,andthenbecamestableuptothe12leafatthebaseofabranch.DIo/CS.decreasedalongwiththeloweringofleafpositionatabranch,whichimpliedthattheyoungandgoldyello
7、wleavesadoptalight—protectionmechanismbyheatdissipationandfluorescenceemission.F∞
8、Fmwashigherthan0.8intheleaveslocatedlowerthanthe9leaf,whichmeantthattheleavesgrowinginbasepartofabranchwereingoodheahh.Theperformanceindex.photosyntheticdrivingforceof11and12leafwassig