铈对UV-B胁迫下大豆幼苗光合原初反应的影响.pdf

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1、农业环境科学学报2010，29(1)：15—18JournalofAgro—EnvironmentScience铈对UV—B梁婵娟1，一，周青(1．江南大学工业生物技术教育部重点实验室，江苏无锡214122；2．江南大学环境与土木工程学院，江苏无锡214122)摘要：用水培法研究了Ce(Ⅲ)对紫外辐射(uv—B，280一-320rim)胁迫下大豆幼苗光合原初反应的影响。结果表明，20mg·L～CeCl3能有效减缓紫外辐射(T1／3．34kJ·m。2和T2／11．76kJ·m。2)胁迫所导致的叶绿素与类胡萝卜素含量减少、光能转换效率(凡／‰)及传递能力(凡儡)降低，且对低剂量胁迫的调控效

2、果优于高剂量，即以上指标Ce+TI>T1，Ce+T2>T2，Ce+TI>Ce+T2。从光合原初反应的能量分配看，Ce(Ⅲ)能促使大豆叶片吸收光能的总量增加，加快内囊体膜上光电的转换和电子的传递，降低UV—B辐射伤害而导致的过剩激发能积累，从而消除过剩激发能诱发的膜脂过氧化对光合器官的潜在威胁。关键词：铈；UV—B辐射；大豆幼苗；光合作用；原初反应中图分类号：Q945．78文献标志码：A文章编号：1672—2043(2010)01—0015—04EffectofCe(m)onPhotosyntheticPrimaryReactioninSoybeanSeedlingUnderUV-BRa

3、diationStressLIANGChan-juanl．ZHOUQin91，2(1．TheKeyLabofIndustrialBiotechnology，MinistryofEducation，JiangnanUniversity，Wuxi214122，China；2．SchoolofEnvironmentalandCivilEngineering，JiangnanUniversity，Wuxi214122，China)Abstract：Effectofcerium(1lI)onphotosyntheticprimaryreactioninsoybeanseedlingsunderu

4、hraviolet-Bradiation(UV-B，280一-320nm)studiedwithhydrotunderlaboratoryconditions．UV-Bradiation(T1／3．34kJ·m～。T2／11．一6一·1)causedthedecreasestresswasstudiedwithhydroponicsunderlaboratoryconditionsUVBradiation1334kJm217kJm-Zcausedthedecrease．【．·～。1．6·)inchlorophyll(Chl)andcarotenoid(Car)content，optim

5、alphotochemicalefficiencyofPSH(凡／‰)andlighttransportcapacity(Fv／F0)，andtheaccumulationof‘'gy．Thedecreasedeg：ofeachindexpositivelyrelatedwithUV-Bradiationdosage．HowevertheexcessaccumulationoIexcitationenergyhedecreasedegreeoIeachindexwaspositivelyrelatedwithUVBradiationdosageHowever．●CeCl3(20mg·L

6、。1)increasedChlandCarcontent，而／‰and凡／F0，comparedwiththoseofthecontrols．ForCe+UV—Btreatments，a11ofindiceswerestilllowerthanthoseofthecontrols，butobviouslyhigherthanthoseofUV-Btreatments．Thesequencewasfollowedas：Ce+TI>T1；Ce+T2>T2；Ce+T1>Ce+T2．TheresultindicatedthatCe(20mg·L一1)couldalleviateUV-B-ind

7、ucedinhibitiononphotosyntheticprima-ryreaction，andthatregulatingeffectofCeonallindicesmentionedaboveunderlowdosageofUV-Bradiationwasbetterthanthatunderhighdosage．Astotheexcitationenergydistributioninphotosyntheticlightreacti