Effects of Pb2+ on the active oxygen-scavenging enzyme activities and ultrastructure in Potamogeton crispus leaves

被引：59

作者：

Hu, J. Z. ^{[1
]}

Shi, G. X. ^{[1
]}

Xu, Q. S. ^{[1
]}

Wang, X. ^{[1
]}

Yuan, Q. H. ^{[1
]}

Du, K. H. ^{[1
]}

机构：

[1] Nanjing Normal Univ, Coll Life Sci, Inst Plant Cell & Mol Biol, Nanjing 210097, Peoples R China

来源：

RUSSIAN JOURNAL OF PLANT PHYSIOLOGY | 2007年 / 54卷 / 03期

基金：

高等学校博士学科点专项科研基金; 中国国家自然科学基金;

关键词：

Potamogeton crispus; lead ion; antioxidant enzymes; ultrustructural damage; toxicity;

D O I：

10.1134/S1021443707030181

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

The effects of various concentrations of Pb2+ on the antioxidant enzyme activities and the ultrastructure in Potamogeton crispus leaves were studied. Peroxidase (POD) activity and malondialdehyde (MDA) content peaks were observed with an increase in Pb2+ concentration, whereas superoxide dismutase (SOD) and catalase (CAT) activities decreased firstly and then rose. Meantime, the chlorophyll content declined with increasing Ph2+ concentration. Simultaneously, high concentrations of Ph2+ aggravated ultrastructural damage to the leaf cells including swelling of chloroplasts, disruption and disappearance of chloroplast envelopes; swelling of mitochondrial cristae, deformation and vacuolation of mitochondria; condensation of chromatin, dispersion of nucleoli, and disruption of nuclear membrane. Changes in antioxidant enzyme activities and damage to fine structure are the results of lead-induced ROS accumulation. The estimated lethal concentration to P. crispus ranged from 10 to 15 mg/l lead.

引用

页码：414 / 419

页数：6

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