5种国兰(Cymbidium)的光合特性

2005,32(1):151154ActaHorticulturaeSinica:2004-07-01;:2004-11-083Athorforcorrespondence(E2mail:gaohy@sdau1edu1cn)5(Cymbidium)113123(1,271018;2,250100;3,271018):5(Cymbidium)CO2CO2C3;310519molm-2s-1,2000molmol-1CO2,CO2;5;350650molm-2s-1,,,,,5,,,:;;:S682131:A:05132353X(2005)0120151204ThePhotosyntheticCharacteristicsofFiveSpeciesofCymbidiumLiPengmin1,GaoHuiyuan13,ZouQi1,WangTao2,andLiuYong3(1PlantScienceDepartmentofShandongAgriculturalUniversity,Taipan271018,China;2CropResearchInstitute,ShandongAcademyofAgriculturalSciences,Jipnan250100,China;3TaipanLandscapeAdministrationBureau,Taipan271018,China)Abstract:ThephotosyntheticcharacteristicsoffivespeciesofCymbidiumwerestudiedbygasexchangeandanalysisofchlorophyllfluorescence.Accordingtothelightsaturationpoints,thelightcompensationpoints,theCO2saturationpointsandtheCO2compensationpoints,thefivespeciesofcymbidiumhavethecharacteristicsofC3plants.Thephotosyntheticrateswerebetween310-519molm-2s-1.TheresultsalsodemonstratedthatthephotosyntheticrateswerelargelyaffectedbytheconcentrationsoftheCO2whiletheCO2concentrationswerebelow2000molmol-1.Andtherewerealsosomedifferencesamongthephotosyn2theticcapacities,theapparentquantumyieldsandthecarboxylationefficienciesinleavesofthefivespecies.Thelightsaturationpointswerebetween350-650molm-2s-1indicatingthatallfivespeciesofCymbid2iumwereshade2acclimatedplants,amongwhichC.goeringiiandC.ensifoliumhaverelativelylowershade2enduredcapacities;whileC.sinenseandC.longibracteatumhaverelativelyhighershade2enduredcapacities;andC.faberihasrelativelymoderateshade2enduredcapacity.Thelightactivationofphotochemicalreactionandphotochemicalefficienciesaftertheactivationsinthefivespeciesexhibitedobviousdifferences,whichmaybecorrelatewiththeoriginallyecologicalconditions,theacclimationsandtheevolutionsofdifferentspe2ciesofcybidium.Keywords:Cymbidium;Photosyntheticcharacteristics;Theefficiencyofphotochemistry11,2,(Cymbidium)3,4,,,,,32,5:(C.ensifolium)(C.goeringii)(C.longibractea2tum)(C.faberi)(C.sinense),5,2,,24,010,70%2,253PPSystemsCIRAS22CO2(Pn)-CO2-:600molm-2s-1,CO2350molmol-1,25,75%;10800molmol-114-,10min,-;CO2502000molmol-112CO2-,CO2(Ci)-;(Ci350molmol-1)HansatechFMS2230min,1000molm-2s-1,15s1Fvp/FmpqPPSNPQDemmig2Adams5;LSD2211511,5C3(1025molm-2s-1),68;,4C3,01010103molCO2mol-1photon9;,,,5,,,,15Table1DifferencesinphotosyntheticparametersoffivecymbidiumspeciesMaterialPhotosyn2theticrate(molm-2s-1)Photosyntheticcapacity(molm-2s-1)Carboxylationefficiency(molm-2s-1)CO2CO2saturat2ionpoint(molmol-1)CO2CO2compens2ationpoint(molmol-1)Apparentquant2umyield(molCO2mol-1photon)Lightsatura2tionpoint(molm-2s-1)Lightcompen2sationpoint(molm-2s-1)C.ensifolium519014a1215211a0104401012a5812d0103201007b60030a27523aC.goeringii318013b917113b0102701008b3211e0101501004c60034a5011bC.logibracteatum310012b513017d0101701004c13310a0103001005b40042c105cC.faberi319012b710015c0102201003bc1865509813c0104501009a50032b104cC.sinense313012c710110c0102201006bc11110b0104501007a40021c104c:5%;CO22000molmol-1Note:Differentlettersindicatesignificantdifferenceat5%level;indicatevaluesofCO2saturationpointbeyond2000molmol-1.5C3(01060112molm-2s-1),68;2000molmol-1CO2,CO2,5(1,A),01000molmol-1,CO2,,,CO25CO2,C3,2511:5(Cymbidium)15CO2-(A),CO2(Ci)-(B),-(C)600molm-2s-1(AB)350molm-2s-1CO2(C)2575%Fig.1ResponsesofphotosynthesistodifferentCO2concentrations(A),differentintercellularCO2concentrations(B)anddifferentphotonfluxdensities(PFD)(C)TheleavesinfivespeciesofCymbidiumunder600molm-2s-1PFD(A,B)at350molmol-1CO2(C),25and75%relativehumidity32125qPPS,22,,,,,,;,PS,,(2,B),,,25qPPSTable2InitialslopesofthetimecoursesofqPandPSuponexposureto1000molm-2s-1lightinfivespeciesofCymbidiumMaterialInitialslopeqPPSIIC.ensifolium010032010003d010020010002cC.goeringii010029010002e010017010001dC.logibracteatum010042010003b010021010001cC.faberi010035010003c010027010002bC.sinense010057010004a010032010002a:5%Note:Differentlettersindicatesignificantdifferenceat5%level.2(1000molm-2s-1)5qP(A),PS(B),NPQ(C)Fvp/Fmp(D)350molmol-1CO225Fig.2TimecoursesofqP(A),PS(B),NPQ(C)andFvp/Fmp(D)infivespeciesofCymbidiumExposureto1000molm-2s-1lightfromdark2adaptedconditionsin350molmol-1CO2at25351325,,,,;,,;,,,,,5(NPQ)(2,C),,,,5,:1ArdittiJ.Aspectsofthephysiologyoforchid.In:WoolhouseHWed.Advancesinbotanicalresearch,Vol.7.NewYork:AcademicPress,1979.4426652HewCS.CO2fixationinorchids(minireview).ActaPhytophysiologicaSinica,1989,15:2172223,,..,1998,6(1):2529YeQS,PanRC,HewCS.StudyonthephotosyntheticpathwayofCymbidium.JournalofTropicalandSubtropicalBotany,1998,6(1):2529(inChinese)4,,..,1993,35(6):441446YeQS,PanRC,HewCS.StudyonthephotosyntheticpathwayofCymbidiumsinense.ActaBotanicaSinica,1993,35(6):441446(inChinese)5Demmig2AdamsB,AdamsWW.Usingchlorophyllfluorescencetoassessthefractionofabsorbedlightallocatedtothermaldissipationofex2cessexcitation.PhysiologiaPlantarum,1996,98:2532646,,..,1999,25(4):408412YangQFJiangHXuDQ.Changesinphotosyntheticefficiencyofflagleavesofwheatduringdevelopment.ActaPhytophysiologicaSinica,1999,25(4):408412(inChinese)7,,..,1997,23(1):626