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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Using Sarcocornia fruticosa and Saccharomyces cerevisiae to remediate metal contaminated sediments of the Ria Formosa lagoon (SE Portugal)
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Towards Plant-Beneficiary Rhizobacteria and Agricultural Sustainability
Mahipal Choudhary,P. C. Ghasal,R. P. Yadav,Vijay Singh Meena,Tilak Mondal,Jaideep Kumar Bisht +5 more
TL;DR: The use of PBR has been proven to be an environmentally sound way of increasing crop yields by facilitating plant growth through either a direct or indirect mechanism with the aim of sustaining soil health over the long term.
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Influence of electrical fields enhanced phytoremediation of multi-metal contaminated soil on soil parameters and plants uptake in different soil sections
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Are grasses really useful for the phytoremediation of potentially toxic trace elements? A review
Flávio Henrique Silveira Rabêlo,Jaco Vangronsveld,Jaco Vangronsveld,Alan J. M. Baker,Alan J. M. Baker,Alan J. M. Baker,Antony van der Ent,Luís Reynaldo Ferracciú Alleoni +7 more
TL;DR: In this paper, a review of the available information on the mechanisms involved in uptake, transport, accumulation, toxicity and tolerance to trace elements in grasses is presented, and the main strategies used to improve trace elements phytoremediation efficiency by grasses are described.
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