铅胁迫对空心莲子草生长和生理指标的影响

摘要

[ Objective ] The paper aimed to discuss effects of different concentrations of lead stress on Alternanthera Philoxeroides growth and physiological indices, to explore phytoremediation methods for removal of lead pollution. [ Method] Alternanthera Philoxeroides in water culture was treated with different concentration of lead, and then, its external injury was observed, its growth and physiological indexes were measured. [ Result] Alternanthera Philoxeroides biomass and chlorophyll content decreased; conductivity and malonaldehyde (MDA) content were increased; the SOD, POD and CAT activities showed a trend of first increase and then decrease with increase in concentration of lead stress.[ Conclusion ] With increase in lead concentration, the cell membrane permeability increased and MDA had a higher accumulation, antioxidant enzymes activity decreased, the normal oxidative metabolism of Alternanthera Philoxeroides was severely affected, leading it to wilt.%[目的]研究铅胁迫对空心莲子草生长和生理指标的影响,探究重金属铅污染的植物修复方法.[方法]采用不同浓度铅胁迫水培空心莲子草后,观察其外伤症状,并测定其生长指标和生理指标.[结果]随着铅胁迫浓度的增加,空心莲子草生物量和叶绿素含量逐渐降低,茎叶电导率和丙二醛含量持续增加,而SOD,POD和CAT活性则先增加后降低.[结论]当铅浓度不断增加时,空心莲子草茎叶细胞膜透性增大,丙二醛含量高度积累,抗氧化酶系统活力下降,正常氧化代谢受到严重影响,导致植株枯萎.