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
Bioremediation of HMW-PAHs-contaminated soils by rhizosphere microbial community of Fire Phoenix plants
TL;DR: In this paper , the potential of microbes in the rhizosphere of Fire Phoenix plants in biodegradation of polycyclic aromatic hydrocarbons (HMW-PAHs) in a pot-culture experiment was investigated.
Book ChapterDOI
Role of Earthworms on Phytoremediation of Heavy Metal-Polluted Soils
TL;DR: In this paper, the drilosphere compartment, the part of the soil influenced by earthworm secretions and castings, has been considered, and the effect of earthworms on plant production and their effects on heavy metal solubility and availability have been extensively documented.
Journal ArticleDOI
Bio- and phytoremediation: plants and microbes to the rescue of heavy metal polluted soils
Sánchez-Jiménez Arantza,M.-R. Hiram,Kothe Erika,Mauricio N. Chávez-Avilés,Juan Ignacio Valiente-Banuet,Grisel Fierros-Romero +5 more
TL;DR: In this article , a contemporary connection between plants and microbes involving their controlled management is summarized in a visionary display, and a variety of benefits have been registered from symbiotic relationships, including plants teaming up with microbes to cope down with non-biodegradable elements such as heavy metals; but a carefully maneuvered interaction might signify a greater insight toward the application of bioremediation systems.
Journal ArticleDOI
Soil microbial and Ni-agronomic responses to Alyssum murale interplanted with a legume
Ramez F. Saad,Ramez F. Saad,Ahmad Kobaissi,Xavier Goux,Magdalena Calusinska,Guillaume Echevarria,Petra Kidd,Emile Benizri +7 more
TL;DR: This study showed that co-cropping a hyperaccumulator with a legume in Ni-agromining systems not only improves plant biomass and Ni-yields, but also enhanced some soil microbial enzymatic activities.
Book ChapterDOI
Diversity and Role of Endophytic and Rhizosphere Microbes Associated with Hyperaccumulator Plants During Metal Accumulation
TL;DR: In this article, the authors discuss how abiotic factors such as the presence of metals in polluted sites or in naturally metal-rich (ultramafic) soils modulate activities of soil microbial communities.
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.