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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。
The effects of exogenous ABA on chlorophyll content and chlorophyll fluorescence of two sugarcane cultivars under water stress were studied using drought resistant sugarcane variety ROC 22 and non-drought resistant variety ROC 16 as materials. The results showed that under water stress, the chlorophyll degradation of ROC 16 was higher than that of ROC 22, but exogenous ABA could alleviate this degradation. With the increase of water stress, the basic fluorescence (Fo) of two sugarcane varieties increased significantly (Fv / Fm) and the potential activity of PSⅡ (Fv / Fo) of PSⅡ were significantly decreased. The maximum photochemical efficiency of PSⅡ (Fv ’/ Fm’), the photochemical efficiency of PSⅡ (ΦPS2) The extinction coefficient (qP) decreased significantly, indicating that water stress caused injury to the PSⅡ reaction center of sugarcane leaves. The application of exogenous ABA could partially alleviate the damage, especially for ROC 22.