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	Dynamics of rhizosphere properties and antioxidative responses in wheat (Triticum aestivum L.) under cadmium stress
	Li Y. H. ; Wang L. ; Yang L. S. ; Li H. R.
	2014
关键词	Heavy metal pollution Rhizobox experiment Non-destructive sampling Plant soil interaction Protective mechanism hyperaccumulator sedum-alfredii heavy-metals contaminated soils risk-assessment elevated co2 health-risk tolerance accumulation plants china
英文摘要	In this study, we performed a rhizobox experiment to examine the dynamic changes in the rhizosphere properties and antioxidant enzyme responses of Triticum aestivum L. under three levels of cadmium stress. A set of micro-techniques (i.e., Rhizobox and Rhizon SMS) were applied for the dynamically non-destructive collection of the rhizosphere soil solution to enable the observation at a high temporal resolution. The dynamics of soluble cadmium and dissolved organic carbon (DOC) in the rhizosphere soil solutions of the Triticum aestivum L were characterised by the sequence week 0 after sowing (WAS0) < 3 weeks after sowing (WAS3) < 10 weeks after sowing (WAS10), whereas the soil solution pH was found to follow an opposite distribution pattern. Systematically, both superoxide dismutase (SOD) and catalase (CAT) activities in the leaves of the Triticum aestivum L increased concomitantly with increasing cadmium levels (p > 0.05) and growth duration (p < 0.05), whilst ascorbate peroxidase (APX) activity was induced to an elevated level at moderate cadmium stress with a decrease at high cadmium stress (p > 0.05). These results suggested the enhancement of DOC production and the greater antioxidant enzyme activities were two important protective mechanisms of Triticum aestivum L under cadmium stress, whereas rhizosphere acidification might be an important mechanism for the mobilisation of soil cadmium. The results also revealed that plant soil interactions strongly influence the soil solution chemistry in the rhizosphere of Triticum aestivum L., that, in turn, can stimulate chemical and biochemical responses in the plants. In most cases, these responses to cadmium stress were sensitive and might allow us to develop strategies for reducing the risks of the cadmium contamination to crop production. (C) 2014 Elsevier Inc. All rights reserved.
出处	Ecotoxicology and Environmental Safety
卷	102
页	55-61
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/311030/29754]
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	Li Y. H.,Wang L.,Yang L. S.,et al. Dynamics of rhizosphere properties and antioxidative responses in wheat (Triticum aestivum L.) under cadmium stress. 2014.

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