水分胁迫加速蔗叶活性氧产生并削弱蔗叶活性氧清除能力；随水分胁迫强度的加剧，膜脂过氧化产物丙二醛（ＭＤＡ）含量迅速提高，细胞质膜透性增大，蔗叶叶绿体２，６－二氯酚靛酚光还原活性下降，蔗叶叶绿体光系统Ⅱ原初光能转换效率、ＰＳⅡ潜在活性、叶绿体光合量子产额降低 Water stress accelerated the production of reactive oxygen species in sugarcane leaves and reduced the active oxygen scavenging ability of sugarcane leaves. With the intensification of water stress, the content of malondialdehyde (MDA) in membrane lipid peroxidation products increased rapidly and the permeability of plasma membrane increased. , 6-dichlorophenolindophenol decreased, the photosynthetic efficiency of PSⅡ light source, the potential activity of PSⅡ and the photosynthetic quantum yield of chloroplast in sugarcane leaves decreased