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1、作物学报ACTAAGRONOMICASINICA2009,35(10):1916−1922http://www.chinacrops.org/zwxb/ISSN0496-3490;CODENTSHPA9E-mail:xbzw@chinajournal.net.cnDOI:10.3724/SP.J.1006.2009.01916灌浆期干旱胁迫对玉米叶片光系统活性的影响12,311,31,311李耕高辉远赵斌董树亭张吉旺杨吉顺王敬锋1,3,*刘鹏123山东农业大学农学院;山东农业大学生命科学学院;作物生物学国家重点实验室,山东泰安271018摘要:以高淀粉玉米品种郑单21为材料,
2、借助叶绿素荧光快速诱导动力学曲线和820nm光吸收曲线,研究了灌浆期土壤干旱胁迫对玉米籽粒产量和叶片光系统I(PSI)及光系统II(PSII)活性的影响。两年的研究结果均表明,干旱胁迫显著降低叶片光合速率(P<0.05)和籽粒产量(P<0.05)。JIP-test分析发现干旱胁迫导致叶绿素荧光快速诱导动力学曲线中的K点和J点上升,表明PSII放氧复合体(OEC)和QA之后的电子传递链受到抑制,且PSII受体侧受抑制的程度大于供体侧。此外,干旱胁迫也显著地抑制PSI的最大氧化还原活性(ΔI/Io),阻碍光合电子从PSII向PSI的传递,破坏了PSI和PSII的协调性。我们认为干
3、旱胁迫抑制PSI和PSII活性并破坏二者的协调性,是导致Pn和籽粒产量下降的重要原因之一。关键词:玉米;干旱胁迫;叶绿素荧光快速诱导动力学曲线;PSI最大氧化还原活性;820nm光吸收EffectsofDroughtStressonActivityofPhotosystemsinLeavesofMaizeatGrainFillingStage12,311,31,31LIGeng,GAOHui-Yuan,ZHAOBin,DONGShu-Ting,ZHANGJi-Wang,YANGJi-Shun,11,3,*WANGJing-Feng,andLIUPeng123Collegeof
4、Agronomy,ShandongAgriculturalUniversity;CollegeofLifeScience,ShandongAgriculturalUniversity;StateKeyLaboratoryofCropBiology,Tai’an271018,ChinaAbstract:Atgrainfillingstage,theeffectsofdroughtstressonphotosyntheticacivitiesofphotosystemI(PSI)andphotosystemII(PSII)inleavesofmaize(Zhengdan21,ac
5、ultivarwithhighstarchcontent)werestudiedbysimultaneouslyanalyzingchloro-phyllafluorescencetransientandlightabsorbanceat820nm.Theresults,obtainedfromtwoyearsexperiments,demonstratedthatthedroughtstresssignificantlyreducedphotosynthesis(P<0.05)andgrainyield(P<0.05)ofthemaize.TheKandJstepsatfl
6、uorescencetransientwereincreasedbydroughtstress,whichindicatedtheinhibitionofoxygen-evolvingcomplex(OEC)andelectrontransportchainafterQAinPSII.TheacceptorsideofPSIIwasdamagedmoreseverelythanthedonorsideofPSII.Furthermore,themaximaloxidation-reductionactivityofPSI(ΔI/Io)wasalsosignificantlyd
7、ecreasedbythedroughtstress,whichinhibitedthephotosyntheticelectrontranportfromthePSIItoPSI,destructingthecoordinationbetweenPSIandPSII.WesuggestthattheinhibitionofPSIandPSIIandthedestructionofthecoordinationbetweenPSIandPSIIbythedroughtstressisoneofthema
