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Root excretion and plant tolerance to cadmium toxicity - a review

Author

Listed:
  • J. Dong

    (Department of Agronomy, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, P.R. China)

  • W.H. Mao

    (Department of Agronomy, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, P.R. China
    Center of Analysis and Measurement, Zhejiang University, Hangzhou, P.R. China)

  • G.P. Zhang

    (Department of Agronomy, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, P.R. China)

  • F.B. WU

    (Department of Agronomy, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, P.R. China)

  • Y. Cai

    (Department of Agronomy, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, P.R. China)

Abstract

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 and possible mechanisms. Root exudates markedly altered in species and quantity under Cd stress. Root exudates can affect Cd absorption 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 community construction, the numbers and activities of rhizospheric microbes. In this paper, the methods to reduce the transfer of Cd in soil-plant system by adjusting rhizosphere environment are discussed, and some aspects are also proposed that should be emphasized in the future research work.

Suggested Citation

  • J. Dong & W.H. Mao & G.P. Zhang & F.B. WU & Y. Cai, 2007. "Root excretion and plant tolerance to cadmium toxicity - a review," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 53(5), pages 193-200.
    • Handle: RePEc:caa:jnlpse:v:53:y:2007:i:5:id:2205-pse
    DOI: 10.17221/2205-PSE
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