Pb单一及Pb-Cu复合胁迫对香蒲部分生理指标的影响

Effects of Pb single and Pb-Cu complex stresses on some physiological indexes of Typha orientalis Presl

近年来,许多研究者^（[1-4]）针对重金属胁迫条件下植物生理生化指标变化和体内矿质元素积累规律进行了相关研究,以期筛选出重金属超富集植物,用于重金属污染环境的修复。香蒲属（Typha Linn.）植物宽叶香蒲（T.latifolia Linn.）和狭叶香蒲（T.angustifolia Linn.）均对Pb具有较强的耐性及吸附能力，可用于Ph污染水体的净化和修复；

Changes of photosynthetic pigment （including chlorophyll a, chlorophyll b and carotenoid） content in leaf, MDA and H2O2 contents, 02 production rate, SOD, CAT and POD activities in root and leaf of Typha orientalis Presl were analyzed after stressed by 50 μmol· 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 ; OI production rate and H2O2 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 resuh indicates that T. orientalis has a certain tolerance to 50μmol· L-1 Pb single stress and 50 μmol· L-1 Pb-50μmol· L-1 Cu complex stress, but its protection mechanism replying to Pb single and Pb-Cu complex stresses is probably different.