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INFLUENCE OF THE RHIZOSPHERE ON THE BIODEGRADATION OF ORGANIC XENOBIOTICS – A CASE STUDY WITH 2,4-DICHLOROPHENOXYACETIC ACID

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Book cover Bioremediation of Soils Contaminated with Aromatic Compounds

Part of the book series: NATO Science Series ((NAIV,volume 76))

Abstract

The rhizosphere is the unique environment at the plant-soil interface and a zone of intense soil-plant-microbe interaction. One recorded consequence of this complex interaction is the enhanced microbial biodegradation of organic xenobiotics. Mechanisms suggested to explain rhizosphere enhanced biodegradation range from the direct role of rhizodeposits acting as xenobiotic structural analogs to more indirect possibilities such as increased bioavailability in the rhizosphere. Our aim was to learn more about the mechanisms of enhanced biodegradation in the rhizosphere using the herbicide 2,4-dichlorophenoxyacetic acid (2,4-D) as a model xenobiotic. We report that 2,4-D mineralization is enhanced by root exudates and root debris of legume species. This rhizosphere enhancement may be due to the action of a rhizodeposit component in inducing the 2,4-D pathway. We discuss the possibility that the stimulatory component belongs to the chemical class flavonoids.

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Authors and Affiliations

  1. Imperial College London, Department of Agricultural Sciences, Wye Campus, Ashford, Kent, TN255AH, U.K.

    Liz J. Shaw

  2. School of Land and Food Sciences, The University of Queensland, 4072, Brisbane, Queensland, Australia

    Richard G. Burns

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  1. UFZ-Centre for Environmental Research Leipzig Halle, Leipzig, Germany

    Hermann J. Heipieper

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Shaw, L.J., Burns, R.G. (2007). INFLUENCE OF THE RHIZOSPHERE ON THE BIODEGRADATION OF ORGANIC XENOBIOTICS – A CASE STUDY WITH 2,4-DICHLOROPHENOXYACETIC ACID. In: Heipieper, H.J. (eds) Bioremediation of Soils Contaminated with Aromatic Compounds. NATO Science Series, vol 76. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-5693-2_2

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