Combined toxicity of cadmium and arsenate to wheat seedlings and plant uptake and antioxidative enzyme responses to cadmium and arsenate co-contamination

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 环境化学与生态毒理学国家重点实验室

	Combined toxicity of cadmium and arsenate to wheat seedlings and plant uptake and antioxidative enzyme responses to cadmium and arsenate co-contamination
	Liu, Xiaoli ; Zhang, Shuzhen ; Shan, Xiao-Quan ; Christie, Peter
刊名	ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
	2007-10
卷号	68 期号:2 页码:305-313
关键词	antagonistic effects ID50 amylase activity antioxidative enzymes MDA soluble protein
英文摘要	To demonstrate the combined toxicity of cadmium (Cd) and arsenate (As) to early developmental stages of six wheat varieties, young seedlings were exposed to solutions containing both contaminants and seed germination frequency and seedling biomass, root length and shoot height, Cd and As uptake, amylase activity, superoxide dismutase (SOD), catalase (CAT), peroxidase (POD), soluble protein and malondialdehyde (MDA) concentrations in the seedlings were investigated. Seed germination and seedling biomass and root and shoot elongation decreased significantly (P<0.01) with increasing concentrations of Cd and As and root length appeared to be the most sensitive parameter. Uptake of Cd and As by seedlings increased with increasing Cd and As concentrations in the test solutions and obeyed Michaelis-Menten kinetics. Average total amylolytic, alpha-amylase and beta-amylase activities seemed to decrease with Cd concentrations > 4 mg L-1 and As >=, 4 mg L-1. Seedling contents of soluble protein, MDA and POD increased and the activities of SOD and CAT decreased with increasing concentrations of Cd and As following an initial increase. The MDA content was linearly and positively correlated with seed germination frequency, biomass increment, root length and shoot height elongation (P<0.01), suggesting that MDA may be useful as a. biological indicator of Cd and As toxicity in wheat. Combined exposure to Cd and As produced greater toxicity to wheat than single exposure to each metal separately, and Cd and As in combination had an additive effect on seed germination frequency and antagonistic effects on seedling biomass and shoot and root elongation. (C) 2006 Elsevier Inc. All rights reserved.
WOS记录号	WOS:000250321100012
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/22427]
专题	生态环境研究中心_环境化学与生态毒理学国家重点实验室
推荐引用方式 GB/T 7714	Liu, Xiaoli,Zhang, Shuzhen,Shan, Xiao-Quan,et al. Combined toxicity of cadmium and arsenate to wheat seedlings and plant uptake and antioxidative enzyme responses to cadmium and arsenate co-contamination[J]. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY,2007,68(2):305-313.
APA	Liu, Xiaoli,Zhang, Shuzhen,Shan, Xiao-Quan,&Christie, Peter.(2007).Combined toxicity of cadmium and arsenate to wheat seedlings and plant uptake and antioxidative enzyme responses to cadmium and arsenate co-contamination.ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY,68(2),305-313.
MLA	Liu, Xiaoli,et al."Combined toxicity of cadmium and arsenate to wheat seedlings and plant uptake and antioxidative enzyme responses to cadmium and arsenate co-contamination".ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 68.2(2007):305-313.