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
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Phytoremediation : 植物による環境/土壌浄化
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Biochemical and Molecular Mechanisms of Plant-Microbe-Metal Interactions: Relevance for Phytoremediation.
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References
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Journal ArticleDOI
"In situ" phytostabilisation of heavy metal polluted soils using Lupinus luteus inoculated with metal resistant plant-growth promoting rhizobacteria.
TL;DR: The results indicate the usefulness of L. luteus inoculated with a bacterial consortium of metal resistant PGPRs as a method for in situ reclamation of metal polluted soils.
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Improvement of rape (Brassica napus) plant growth and cadmium uptake by cadmium-resistant bacteria.
Xia-Fang Sheng,Juan-Juan Xia +1 more
TL;DR: Three isolates based upon cadmium-resistance, bio-activation of CdCO3 and growth-promoting activity, three isolates were selected for promoting plant growth and uptake of cadmio-amended soil in pot experiments and inoculation with the isolates was found to increase root dry weight and shoot dry weight of rape.
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Improvement of Brassica napus growth under cadmium stress by cadmium-resistant rhizobacteria
TL;DR: The present observations showed that the bacterial strains used in this study protect the plants against the inhibitory effects of cadmium, probably due to the production of IAA, siderophores and ACCD activity.
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Enhanced phytoextraction of an agricultural Cr- and Pb-contaminated soil by bioaugmentation with siderophore-producing bacteria.
TL;DR: The results suggest that bioaugmentation-assisted phy toextraction is a relevant method in the aim at increasing the phytoextraction rate which usually limits the use of phytoremediation technologies.
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Trace element behaviour at the root-soil interface: Implications in phytoremediation
Petra Kidd,Juan Barceló,M. Pilar Bernal,Flavia Navari-Izzo,Charlotte Poschenrieder,Stefan Shilev,Rafael Clemente,Carmela Monterroso +7 more
TL;DR: A review of mechanisms operating in the rhizosphere and their potential role in improving phytoremediation strategies is provided in this article, where the authors aim to provide an up-to-date review.