| Abstract | Changes of photosynthetic pigment (including chlorophyll a, chlorophyll b and carotenoid) content in leaf,MDA and H2 O2 contents, O2-·production rate, SOD, CAT and POD activities in root and leaf of Typha orientalis Presl were analyzed after stressed by 50μmol·L-1 Pb and 50μmol·L-1 Pb-50μmol·L-1 Cu for 15 d. The results show that under Pb single and Pb-Cu complex stress conditions, chlorophyll a content in leaf of T. orientalis is significantly lower than that of the control, chlorophyll b and carotenoid contents are not significantly different from those of the control;O2 -· production rate and H2 O2 content in root and leaf are generally not significantly different from those of the control, but MDA content is higher or lower than that of the control and the difference is significant. Compared with the control, under Pb single and Pb-Cu complex stress conditions, there are different change rules in SOD, CAT and POD activities in root and leaf. The comprehensive analysis result indicates that T. orientalis has a certain tolerance to 50μmol·L-1 Pb single stress and 50 μmol·L-1Pb-50 μmol·L-1Cu complex stress, but its protection mechanism replying to Pb single and Pb-Cu complex stresses is probably different. |