Root excretion and plant tolerance to cadmium toxicity - a review
2007
Dong, J.,Zhejiang Univ., Hangzhou (China). Dept. of Agronomy | Mao, W.H.,Zhejiang Univ., Hangzhou (China). Dept. of Agronomy | Zhang, G.P.,Zhejiang Univ., Hangzhou (China). Dept. of Agronomy | Wu, F.B.,Zhejiang Univ., Hangzhou (China). Dept. of Agronomy | Cai, Y.,Zhejiang Univ., Hangzhou (China). Dept. of Agronomy
Significant quantities of Cd have been added to soils globally due to various anthropogenic activities, posing a serious threat to safe food production and human health. Rhizosphere, as an important interface of soil and plant, plays a significant role in the agro-environmental system. This article presents a review of relationship between root excretion and microorganisms and plant resistance to Cd toxicity. Root exudates may affect the absorption of Cd by plants through changing the physical and chemical characteristics of rhizospheres. The influence of root exudates on Cd bioavailability and toxicity may include modifying the rhizosphere pH and Eh, chelating/complexing and depositing with Cd ions, and altering the numbers and activities of rhizosphere microbes. Different methods to reduce the transfer of Cd in soil-plant system by adjusting rhizosphere environment are discussed.
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