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	Subcellular cadmium distribution and antioxidant enzymatic activities in the leaves of two castor (Ricinus communis L.) cultivars exhibit differences in Cd accumulation
	Zhang H. Z.; Guo, Q. Q.; Yang, J. X.; Shen, J. X.; Chen, T. B.; Zhu, G. X.; Chen, H.; Shao, C. Y.
	2015
关键词	Castor Subcellular distribution Antioxidant enzyme Cadmium Detoxification mechanism oxidative stress marine diatom contaminated soil brassica-juncea populus x toxicity tolerance poplar wheat phytoremediation
英文摘要	The aims of this study were: (1) the study of cadmium (Cd) accumulation and toxicity in different castor cultivars (Ricinus communis L); (2) to investigate changes in antioxidant enzymatic activities and the subcellular distribution of Cd in young and old leaves from two different castor cultivars, after exposure to two different Cd concentrations, and explore the underlying mechanism of Cd detoxification focusing on antioxidant enzymes and subcellular compartmentalization. The Cd concentration, toxicity, and subcellular distribution, as well as superoxide dismutase (SOD), catalase (CAT), and peroxidase (POD) activities were measured in Zibo-3 and Zibo-9 cultivars after exposure to two different concentrations of Cd (2 mg/L and 5 mg/L) for 10 days. This research revealed Cd accumulation characteristics in castor are root > stem > young leaf > old leaf. Castor tolerance was Cd dose exposure and the cultivars themselves dependent. Investigation of subcellular Cd partitioning showed that Cd accumulated mainly in the heat stable protein (HSP) and cellular debris fractions, followed by the Cd rich granule (MRG), heat denatured protein (HDP), and organelle fractions. With increasing Cd concentration in nutrient solution, the decreased detoxified fractions (BDM) and the increased Cd-sensitive fractions (MSF) in young leaves may indicate the increased Cd toxicity in castor cultivars. The BDM-Cd fractions or MSF-Cd in old leaves may be linked with Cd tolerance of different cultivars of castor. The antioxidant enzymes that govern Cd detoxification were not found to be active in leaves. Taken together, these results indicate Cd tolerance and toxicity in castor can be explained by subcellular partitioning. Crown Copyright (C) 2015 Published by Elsevier Inc All rights reserved.
出处	Ecotoxicology and Environmental Safety
卷	120
页	184-192
收录类别	SCI
语种	英语
ISSN号	0147-6513
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/39059]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Zhang H. Z.,Guo, Q. Q.,Yang, J. X.,et al. Subcellular cadmium distribution and antioxidant enzymatic activities in the leaves of two castor (Ricinus communis L.) cultivars exhibit differences in Cd accumulation. 2015.

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