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Improved Phytoremediation of Organic Contaminants Through Engineering of Bacterial Endophytes of Trees

  • Safiyh Taghavi
  • Nele Weyens
  • Jaco Vangronsveld
  • Daniel van der Lelie
Chapter
Part of the Forestry Sciences book series (FOSC, volume 80)

Abstract

This chapter describes the possibilities of using engineered plant- associated endophytic bacteria to improve phytoremediation of organic contaminants by complementing the metabolic properties of their host plant. Analysis of the endophytic communities isolated from trees grown on groundwater contaminated with benzene, toluene, ethylbenzene, and xylene (BTEX) or trichloroethylene (TCE) revealed the presence of many strains able to degrade BTEX compounds or resist TCE. One would therefore expect that natural communities of endophytic bacteria can significantly contribute to the efficiency of the phytoremediation process. However, especially for the phytoremediation of TCE, in situ evapotranspiration measurements revealed that a significant amount of the contaminant and its metabolites evaporated to the atmosphere, pointing to a far from optimal situation.

An alternative proactive approach to natural enrichment is to inoculate plants with endophytic bacteria that are engineered to optimally metabolize the contaminant of interest, thereby improving the overall phytoremediation process. Examples of successful bioaugmentation to improve the phytoremediation of BTEX and TCE under greenhouse and field conditions are presented, and the possibilities to extend this concept to other contaminants are discussed.

Keywords

Horizontal Gene Transfer Organic Contaminant Endophytic Bacterium Yellow Lupine Endophytic Strain 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Abbreviations

ACC

aminocyclopropane-1-carboxylate

TCE

trichloroethylene

BTEX

benzene, toluene, ethylbenzene and xylene

GRAS

Generally Recognized as Safe

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Safiyh Taghavi
    • 1
  • Nele Weyens
    • 2
  • Jaco Vangronsveld
    • 2
  • Daniel van der Lelie
    • 3
  1. 1.Biology DepartmentBrookhaven National Laboratory (BNL)UptonUSA
  2. 2.Department of Environmental BiologyHasselt University, CMKDiepenbeekBelgium
  3. 3.Center for Agricultural and Environmental BiotechnologyRTI International ResearchTriangle parkUSA

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