The role of plant-associated bacteria in the mobilization and phytoextraction of trace elements in contaminated soils
Angela Sessitsch,Melanie Kuffner,Petra Kidd,Jaco Vangronsveld,Walter W. Wenzel,Katharina Fallmann,Katharina Fallmann,Markus Puschenreiter +7 more
TLDR
The role of plant-associated bacteria to enhance trace element availability in the rhizosphere is reviewed and the kind of bacteria typically found in association with trace element – tolerating or – accumulating plants are reported and discussed to improve trace element uptake by plants and thus the efficiency and rate of phytoextraction.Abstract:
Phytoextraction makes use of trace element-accumulating plants that concentrate the pollutants in their tissues. Pollutants can be then removed by harvesting plants. The success of phytoextraction depends on trace element availability to the roots and the ability of the plant to intercept, take up, and accumulate trace elements in shoots. Current phytoextraction practises either employ hyperaccumulators or fast-growing high biomass plants; the phytoextraction process may be enhanced by soil amendments that increase trace element availability in the soil. This review will focus on the role of plant-associated bacteria to enhance trace element availability in the rhizosphere. We report on the kind of bacteria typically found in association with trace element – tolerating or – accumulating plants and discuss how they can contribute to improve trace element uptake by plants and thus the efficiency and rate of phytoextraction. This enhanced trace element uptake can be attributed to a microbial modification of the absorptive properties of the roots such as increasing the root length and surface area and numbers of root hairs, or by increasing the plant availability of trace elements in the rhizosphere and the subsequent translocation to shoots via beneficial effects on plant growth, trace element complexation and alleviation of phytotoxicity. An analysis of data from literature shows that effects of bacterial inoculation on phytoextraction efficiency are currently inconsistent. Some key processes in plant–bacteria interactions and colonization by inoculated strains still need to be unravelled more in detail to allow full-scale application of bacteria assisted phytoremediation of trace element contaminated soils.read more
Citations
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In Situ Remediation Technology for Heavy Metal Contaminated Sediment: A Review
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Endophytic Microbes: Prospects and Their Application in Abiotic Stress Management and Phytoremediation
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Rhizosphere Management for Phytoremediation of Copper Mine Tailings
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TL;DR: In this article, the authors describe the new advances in the directed use of soil microorganisms and amendments, and discuss the advantages for phytoremediation processes, mainly focused on the stabilization of mine tailing, which has become one of the most serious environmental problems in places where the mining activities are of magnitude.
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Plant-Aid Remediation of Hydrocarbon-Contaminated Sites
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