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
More filters
Journal ArticleDOI
Mechanisms behind bacteria induced plant growth promotion and Zn accumulation in Brassica juncea.
TL;DR: Results from glasshouse experiments on Brassica juncea plants exposed to 400mgZnkg(-1) suggest that bacteria-induced metal chelation is the key mechanism of plant growth promoting bacteria in toxicity attenuation and microbial-assisted phytoremediation.
Journal ArticleDOI
Treatment of the textile industry effluent in a pilot-scale vertical flow constructed wetland system augmented with bacterial endophytes.
Zahid Hussain,Muhammad Arslan,Muhammad Arslan,Mumtaz Hasan Malik,Muhammad Mohsin,Samina Iqbal,Muhammad Afzal +6 more
TL;DR: Conclusively, VFCWs proved to be an effective methodology for treatment of textile effluent whereas its smaller size with high efficiency is an advantage for field-scale applications.
Journal ArticleDOI
Floating Wetlands: A Sustainable Tool for Wastewater Treatment
Munazzam Jawad Shahid,Muhammad Arslan,Shafaqat Ali,Muhammad Hussnain Siddique,Muhammad Afzal +4 more
Journal ArticleDOI
Integrated perspectives on the use of bacterial endophytes in horizontal flow constructed wetlands for the treatment of liquid textile effluent: Phytoremediation advances in the field.
Zahid Hussain,Muhammad Arslan,Mumtaz Hasan Malik,Muhammad Mohsin,Samina Iqbal,Muhammad Afzal +5 more
TL;DR: Evaluated on-site performance of endophyte-assisted pilot-scale horizontal flow constructed wetlands for the remediation of effluent from a textile industry found that the system was able to remove a significant proportion of both organic and inorganic pollutants.
Journal ArticleDOI
Microbial associated plant growth and heavy metal accumulation to improve phytoextraction of contaminated soils
TL;DR: In this article, a meta-analysis of the results from 103 microbial-augmented phytoextraction studies was performed to examine if one of these microbial mechanisms has a greater potential to positively impact the efficiency of phytocarboxylic acidification.
References
More filters
Journal ArticleDOI
Microbial heavy-metal resistance
TL;DR: This review describes the workings of known metal-resistance systems in microorganisms and the transport of the 17 most important (heavy metal) elements is compared.
Terrestrial higher plants which hyperaccumulate metallic elements. a review of their distribution, ecology and phytochemistry
TL;DR: Phytochemical studies suggest that hyperaccumulation is closely linked to the mechanism of metal tolerance involved in the successful colonization of metalliferous and otherwise phytotoxic soils.
Journal ArticleDOI
Organic acids in the rhizosphere: a critical review
TL;DR: In this article, a review of the role of organic acids in rhizosphere processes is presented, which includes information on organic acid levels in plants (concentrations, compartmentalisation, spatial aspects, synthesis), plant efflux (passive versus active transport, theoretical versus experimental considerations), soil reactions (soil solution concentrations, sorption) and microbial considerations (mineralization).
Journal ArticleDOI
Accumulators and excluders ?strategies in the response of plants to heavy metals
TL;DR: In this paper, two basic strategies of plant response are suggested, accumulators and excluders, which do not generally suppress metal uptake but result in internal detoxification, and indicators are seen as a further mode of response where proportional relationships exist between metal levels in the soil, uptake and accumulation in plant parts.
Journal ArticleDOI
An efficient microbiological growth medium for screening phosphate solubilizing microorganisms
TL;DR: The results indicated that the criterion for isolation of phosphate solubilizers based on the formation of visible halo/zone on agar plates is not a reliable technique, and soil microbes should be screened in NBRIP broth assay for the identification of the most efficient phosphate soluble inorganic phosphates in liquid medium.