铝胁迫对常绿杨幼苗光系统Ⅱ的影响  

Effects of aluminum stress on PSⅡ in evergreen poplar seedlings

作　　者：钱莲文[1] 龚吉蕊[2] 孙境蔚[1] 

机构地区：[1]泉州师范学院资源与环境科学学院,福建泉州362000 [2]北京师范大学资源学院,北京100875

出　　处：《北京师范大学学报（自然科学版）》2015年第3期261-266,共6页Journal of Beijing Normal University(Natural Science)

基　　金：国家自然科学基金资助项目(31100459);福建省教育厅A类科技基金资助项目(JA12272)

摘　　要：以常绿杨无性系A-61/186(Populus×euramericanacv.)为供试材料,研究铝胁迫对常绿杨叶绿素荧光特性的影响.结果表明:常绿杨水培实验苗叶片PSII实际电子传递量子效率yield值和最大量子效率Fv/Fm值的日变化均表现出了"早晚高、午间低"的变化趋势,且胁迫浓度越高、时间越长,午间下降趋势越明显.初始荧光F0和非光化学淬灭系数NPQ的日变化则呈现与yield和Fv/Fm相反的趋势,表现出"早晚低,午间高"的趋势.说明遭受铝胁迫的植株将更多地吸收光能通过非光化学的途径耗散,从而使其光合效率降低.光响应指标的分析进一步表明铝胁迫会降低常绿杨光合效率,较短时间胁迫下(60d),胁迫浓度达到0.518mmol·L-1,会对光合效能产生显著影响,随着胁迫时间(90d)的加长,胁迫浓度达到0.370mmol·L-1时,就会对光合效率产生显著影响.A-61/186(Populus×euramericana cv.)was used to study influence of aluminum stress on chlorophyll fluorescence.It was found that actual photochemistry efficiency(yield)and maximal photochemical efficiency(Fv/Fm)were high in the morning and evening,but low at noon;this depression at noon was aggravated by prolonged aluminum treatment.Diurnal variation in minimal fluorescence(F0)and nonphotochemical quenching coefficient(NPQ)showed a reversed trend,it was high at noon and low in mornings and evenings.Therefore absorbed light energy under aluminum stress was prone to be dissipated by nonphotochemical quenching,to decrease plant photosynthetic efficiency.Light response index further suggests that aluminum stress decrease photosynthetic efficiency of evergreen poplar.A sixty-day continued aluminum stress(60d)affected photosynthetic efficiency significantly at aluminum concentrations≥0.518mmol·L-1 and a ninety-day continued stress(90d)affected photosynthetic efficiency significantly at concentrations≥0.370mmol·L-1.

关 键 词：常绿杨 铝胁迫 光系统II 叶绿素荧光 

分 类 号：Q945.78[生物学—植物学]