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
Engineering the Rhizosphere
TL;DR: The plants are no longer seen as 'individual' but rather as a holobiont, in other words a unit of selection in evolution, a concept that holds great promise for future plant breeding programs.
Journal ArticleDOI
Impact of irrigation with wastewater on accumulation of heavy metals in soil and crops in the region of Marrakech in Morocco
TL;DR: In this paper, the authors analyzed water, soil and vegetable samples for Zn, Cu, Pb and Cd concentrations and transfer factor from soils to plants (TF) were analyzed, daily intake of metals (DIM) and health risk index (HRI) were calculated.
Journal ArticleDOI
Copper and cobalt accumulation in plants: a critical assessment of the current state of knowledge
Bastien Lange,Antony van der Ent,Antony van der Ent,Alan J. M. Baker,Alan J. M. Baker,Alan J. M. Baker,Guillaume Echevarria,Grégory Mahy,François Malaisse,Pierre Jacques Meerts,Olivier Pourret,Nathalie Verbruggen,Michel-Pierre Faucon +12 more
TL;DR: Practical application of Cu-Co accumulator plants in phytomining is limited due to their dose-dependent accumulation characteristics, although for Co field trials may be warranted on highly Co-contaminated mineral wastes because of its relatively high metal value.
Journal ArticleDOI
Cadmium stress in plants: A critical review of the effects, mechanisms, and tolerance strategies
Taoufik El Rasafi,Abdallah Oukarroum,Abdelmajid Haddioui,Hocheol Song,Eilhann E. Kwon,Nanthi Bolan,Filip Tack,Abin Sebastian,Majeti Narasimha Vara Prasad,Jörg Rinklebe +9 more
TL;DR: This review discusses the deleterious effects of Cd in plants and the tolerant effects in animals and humans.
Journal ArticleDOI
Enhanced degradation of textile effluent in constructed wetland system using Typha domingensis and textile effluent-degrading endophytic bacteria
Maryam Shehzadi,Muhammad Afzal,Muhammad Umar Khan,Ejazul Islam,Amina Mobin,Samina Anwar,Qaiser M. Khan +6 more
TL;DR: Bacterial inoculation enhanced textile effluent-degrading bacterial population in rhizosphere, root and shoot of T. domingensis and revealed that the combined use of plant and endophytic bacteria is one of the approaches to enhance textile Effluent degradation in a constructed wetland system.
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.