水分胁迫下外源ABA对甘蔗叶绿素荧光特性的影响（英文）

以抗旱甘蔗品种ROC 22与不抗旱品种ROC 16为材料,研究水分胁迫条件下外源ABA对2个甘蔗品种叶片叶绿素含量及叶绿素荧光特性的影响。结果表明,水分胁迫下,ROC 16的叶绿素降解程度高于ROC 22,而外源ABA能够缓解这种降解作用;随着水分胁迫的加剧,两个甘蔗品种叶片的基础荧光（Fo）显著升高,PSⅡ原初光能转化效率（Fv/Fm）和PSⅡ的潜在活性（Fv/Fo）显著下降,光适应下PSⅡ最大光化学效率（Fv’/Fm’）、PSⅡ实际光化学效率（ΦPS2）、光化学猝灭系数（qP）显著下降,表明水分胁迫使甘蔗叶片PSⅡ反应中心受到伤害,施加外源ABA能部分减轻这种伤害,以对ROC 22作用尤为显著。

Effect of exogenous ABA application on chlorophyll fluorescence in sugarcane under water stress conditions

Studies have been undertaken to investigate the effects of exogenous Abscisic acid（ABA） application on chlorophyll fluorescence of sugarcane under water stress conditions in soil pot culture system using drought sensitive （ROC 16） and tolerant（ROC 22） varieties.The results show that the total chlorophyll can be protected better in ROC 22 than ROC 16 from degradation by exogenous ABA under water stress.The minimal fluorescence（Fo） of the plants increased significantly,while the maximum quantum yield of PSⅡ（Fv/Fm） and activity potential of PSⅡ（Fv/Fo） decreased markedly with increasing drought severity.The capture efficiency of excitation energy（Fv’ / Fm’）,the actual PSⅡ efficiency under irradiance（ΦPS2） and the photochemical quenching（qP） were decreased by the onset of drought stress at the light-adaptation,suggesting that PSⅡ reaction center was destroyed by water stress,these damages can be alleviated,at least in part,by exogenous ABA treatment,but the effect was more stronger to ROC 22,maybe due to the less degradation of chlorophyll of ROC 22 under water stress.