摘要
弱光(60μmol·m-2·s-1)下10℃低温处理增强了番茄叶片和根系中SOD、POD的活性;5℃处理虽促进了叶片和根系中POD,以及根系中SOD的活性,但导致了叶片中SOD活性的下降;低温弱光导致了叶片和根系中CAT活性的显著降低.正常光温下恢复14d后,10℃处理植株叶片中SOD、CAT和根系中CAT活性均能恢复到对照水平,叶片中POD和根系中SOD、POD活性也能保持较高的活性甚至还有所上升;5℃处理植株叶片中SOD、POD活性能恢复到对照水平或仍保持较高活性,CAT的活性也能得到很大程度上的恢复,而根系中虽然SOD活性有所上升,但CAT只有轻微的恢复,POD活性则反而下降.
Antioxidant enzymes activities were determined in leaves and roots during and after chiling (10℃ and 5℃)under low light (60μ mol·m-2·s-1). Chilling at 10℃ increased the activities of SOD and POD in both leaves and roots. For chilling at 5℃, the activities of POD were increased in both leaves and roots, and the activities of SOD in roots were increased, but the activities of SOD of leave were decreased. The activities of CAT, a cold-sensitive enzyme, were decreased rapidly in both leaves and roots after chilling. After 14 days of recovery at 25℃, tht activities of SOD, POD and CAT in leaves for 10℃ recovered to the level of control leaves, the activities POD in leaves and SOD, POD in roots maintained higher than that of control or increased. For 5℃, the activities of SOD and POD in leaves recovered to the leviel of control leaves, or maintained higher than that of control, but the activities of CAT in liaves did not recover to the value of control leaves. However, in roots, the activities of SOD were increased, but activities of CAT recovered slightly, and the activities of POD were decreased.
