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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Mercury alters the rhizobacterial community in Brazilian wetlands and it can be bioremediated by the plant-bacteria association.
Caylla Mariano,Ivani Souza Mello,Breno Barros,Gilvan Ferreira da Silva,Ailton José Terezo,Marcos Antônio Soares +5 more
TL;DR: Bacteria isolated from contaminated environments had higher minimum inhibitory concentration values, presented plasmids and the merA gene, and were multi-resistant to metals and antibiotics, and could be added to biofertilizers produced in research and related industries.
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Bacterial community diversity in the rhizosphere of nickel hyperaccumulator species of Halmahera Island (Indonesia)
Séverine Lopez,Xavier Goux,Antony van der Ent,Antony van der Ent,Peter D. Erskine,Guillaume Echevarria,Magdalena Calusinska,Jean Louis Morel,Emile Benizri +8 more
TL;DR: Redundancy analysis between soil chemical characteristics and bacterial phyla relative abundances for the three main species showed that the main factor driving the bacterial diversity in the rhizosphere of Rinorea aff.
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Long-term Stability of Trace Element Concentrations in a Spontaneously Vegetated Urban Brownfield With Anthropogenic Soils
TL;DR: In this paper, the authors analyzed soil data collected from 1995, 2005, and 2015 (28, 38, and 48 years since site abandonment) in a spontaneously vegetated urban brownfield contaminated with As, Cr, Cu, Pb, and Zn.
Journal ArticleDOI
Functionally dissimilar soil organisms improve growth and Pb/Zn uptake by Stachys inflata grown in a calcareous soil highly polluted with mining activities.
Ali Mahohi,Fayez Raiesi +1 more
TL;DR: The results showed that it is possible to use the combination of metal-tolerant soil organisms as a potential bioaugmentation tool to accelerate metal phytoremediation rate in calcareous soils polluted by Pb/Zn mining activity under arid conditions.
Journal ArticleDOI
Phytostabilization of Polluted Military Soil Supported by Bioaugmentation with PGP-Trace Element Tolerant Bacteria Isolated from Helianthus petiolaris
Anabel Saran,Valeria Imperato,Lucia Fernandez,Panos Gkorezis,Jan D'Haen,Luciano Jose Merini,Jaco Vangronsveld,Sofie Thijs +7 more
TL;DR: Results indicate that, depending on the strain, bioaugmentation with specific beneficial bacteria can improve plant growth and either reduce trace element mobility or enhance plant trace element uptake.
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