Research review paperPlant growth promoting rhizobacteria and endophytes accelerate phytoremediation of metalliferous soils
Section snippets
Heavy metal pollution and microbe-assisted phytoremediation
Continued worldwide industrialization has caused extensive environmental and human health problems. A wide variety of chemicals, e.g., heavy metals, pesticides, chlorinated solvents, etc., have been detected in different natural resources such as soil, water, and air (Mansour and Gad, 2010). Among the pollutants, the heavy metals are of concern to human health due to their cytotoxicity, mutagenicity, and carcinogenicity (Lim and Schoenung, 2010). Phytoremediation is the use of plants to
Synergism of plant–microbe interactions for cleanup of metalliferous soils
Plant growth is affected by microbes in various ways. Some microbes cause diseases and inhibit plant growth; others can actively or passively promote the growth through a variety of mechanisms (nitrogen fixation, solubilization of phosphate, production of siderophores, phytohormone, and ACC deaminase) (Fig. 2); and there are a large number of soil microorganisms that do not appear to directly affect plant growth one way or the other, although this may vary as a result of a range of different
Role of metal-resistant bacteria on plant growth in metal-contaminated soils
In both natural and managed ecosystems, plant-associated bacteria play a key role in host adaptation to a changing environment. These microorganisms can alter plant cell metabolism, so that upon exposure to heavy metal stress, the plants are able to tolerate high concentrations of metals and thus can better withstand the challenge (Welbaum et al., 2004). Several of the plant-associated bacteria have been reported to accelerate phytoremediation in metal-contaminated soils by promoting plant
Role of metal-resistant bacteria on metal accumulation by plants
Although several conditions, for example, the plant growth, metal tolerance/accumulation, bacterial colonization, and plant growth promoting potentials must be met for microbe assisted phytoremediation to become effective, the concentration of bioavailable metals in the rhizosphere greatly influences the quantity of metal accumulation in plants, because a large proportion of heavy metals are generally bound to various organic and inorganic constituents in polluted soil and their
Concluding remarks and future perspectives
The role of soil microbiota, specifically rhizospheric and endophytic microorganisms, in the development of phytoremediation techniques has to be elucidated in order to speed up the process and to optimize the rate of mobilization/absorption/accumulation of pollutants. To efficiently phytoremediate metal-contaminated soils, the bioavailability of metals to plant roots is considered to be a critical requirement for plant metal bioconcentration or bioimmobilization to occur. In this regard, it
Acknowledgments
M.N.V.P. and H.F. thankfully acknowledge the financial support by the Department of Science and Technology (DST), Government of India, New Delhi [DST/INT/PORTUGAL/PO-22/04/16-7-2007], and GRICES (Gabinete de Relacoes Internacionais da Ciencia e do Ensino Superior, Ministerio da Ciencia, Technologia e Ensino Superior, Lisbon, Portugal) in the frame work of the Indo-Portugal Programme of Cooperation in Science and Technology.
References (134)
- et al.
Bacterial inoculants affecting nickel uptake by Alyssum murale from low, moderate and high Ni soils
Soil Biol Biochem
(2006) - et al.
Effect of plant growth promoting rhizobacteria on young apple tree growth and fruit yield under orchard conditions
Sci Hortic
(2007) - et al.
Endophytes: an emerging tool for biological control
Biol Control
(2008) - et al.
Enhanced phytoextraction of an agricultural Cr-, Hg- and Pb-contaminated soil by bioaugmentation with siderophore producing bacteria
Chemosphere
(2009) - et al.
Isolation and characterization of phosphate solubilizing bacteria from the rhizosphere of crop plants of Korea
Soil Biol Biochem
(2005) - et al.
Plant growth-promoting bacteria in the rhizo- and endosphere of plants: their role, colonization, mechanisms involved and prospects for utilization
Soil Biol Biochem
(2010) - et al.
Effects of rhizobacterial ACC deaminase activity on Arabidopsis indicate that ethylene mediates local root responses to plant growth-promoting rhizobacteria
Plant Sci
(2008) - et al.
“In situ” phytostabilisation of heavy metal polluted soils using Lupinus luteus inoculated with metal resistant plant-growth promoting rhizobacteria
J Hazard Mater
(2010) - et al.
Improvement of Brassica napus growth under cadmium stress by cadmium-resistant rhizobacteria
Soil Biol Biochem
(2008) - et al.
Involvement of siderophores in the reduction of metal-induced inhibition f auxin synthesis in Streptomyces spp
Chemosphere
(2008)
Metal-induced oxidative stress impacting plant growth in contaminated soil is alleviated by microbial siderophores
Soil Biol Biochem
Fluorescent pseudomonads occurring in Macrotermes subhyalinus mound structures decrease Cd toxicity and improve its accumulation in sorghum plants
Sci Total Environ
Phytoremediation: synergistic use of plants and bacteria to clean up the environment
Biotechnol Adv
Using soil bacteria to facilitate phytoremediation
Biotechnol Adv
A model for the lowering of plant ethylene concentrations by plant growth-promoting bacteria
J Theor Biol
Intracellular and extracellular PGPR: commonalities and distinctions in the plant–bacterium signaling processes
Soil Biol Biochem
Properties of bacterial endophytes and their proposed role in plant growth
Trends Microbiol
Increased cadmium and lead uptake of a cadmium hyperaccumulator tomato by cadmium-resistant bacteria
Exotoxicol Environ Saf
Effect of Zn-tolerant bacterial strains on growth and Zn accumulation in Orychophragmus violaceus
Appl Soil Ecol
Characterization of copper-resistant bacteria and assessment of bacterial communities in rhizosphere soils of copper-tolerant plants
Appl Soil Ecol
Isolation and characterization of a heavy metal-resistant Burkholderia sp. from heavy metal-contaminated paddy field soil and its potential in promoting plant growth and heavy metal accumulation in metal-polluted soil
Chemosphere
Trace element behaviour at the root–soil interface: implications in phytoremediation
Environ Exp Bot
Influence of plant growth promoting bacteria and its mutant on heavy metal toxicity in Brassica juncea grown in fly ash amended soil
Chemosphere
Role of metal resistant plant growth promoting bacteria in ameliorating fly ash to the growth of Brassica juncea
J Hazard Mater
Zn, Cd and Hg accumulation by microorganisms, organic and inorganic soil components in multicompartment system
Soil Biol Biochem
Human health and ecological toxicity potentials due to heavy metal content in waste electronic devices with flat panel displays
J Hazard Mater
Inoculation of plant growth promoting bacterium Achromobacter xylosoxidans strain Ax10 for the improvement of copper phytoextraction by Brassica juncea
J Environ Manage
Improvement of plant growth and nickel uptake by nickel resistant-plant growth promoting bacteria
J Hazard Mater
Isolation and characterization of Ni mobilizing PGPB from serpentine soils and their potential in promoting plant growth and Ni accumulation by Brassica spp
Chemosphere
Metal tolerating methylotrophic bacteria reduces nickel and cadmium toxicity and promotes plant growth of tomato (Lycopersicon esculentum L.)
Chemosphere
Risk assessment of pesticides and heavy metals contaminants in vegetables: a novel bioassay method using Daphnia magna Straus
Food Chem Toxicol
Plant growth-promoting bacteria confer resistance in tomato plants to salt stress
Plant Physiol Biochem
Involvement of secondary metabolites and extracellular lytic enzymes produced by Pseudomonas fluorescens in inhibition of Rhizoctonia solani, the rice sheath blight pathogen
Microbiol Res
Signals from the underground: bacterial volatiles promote growth in Arabidopsis
Trends Plant Sci
Effects of inoculation of plant-growth promoting bacteria on Ni uptake by Indian mustard
Bioresour Technol
Influence of metal resistant-plant growth-promoting bacteria on the growth of Ricinus communis in soil contaminated with heavy metals
Chemosphere
Influence of plant growth promoting bacteria and Cr6+ on the growth of Indian mustard
Chemosphere
Endophytic bacteria and their potential to enhance heavy metal phytoextraction
Chemosphere
Potential of siderophore-producing bacteria for improving heavy metal phytoextraction
Trends Biotechnol
The role of bacteria on heavy-metal extraction and uptake by plants growing on multi-metal-contaminated soils
World J Microbiol Biotechnol
Ethylene biosynthesis: identification of l-aminocyclopropane-carboxylic acid as an intermediate in the conversion of methionine to ethylene
Proc Natl Acad Sci U S A
Cytokinin producing bacteria enhance plant growth in drying soil
Plant Soil
The role of root exudates in rhizosphere interactions with plants and other organisms
Annu Rev Plant Biol
Enhancement of chilling resistance of inoculated grapevine plantlets with a plant growth-promoting rhizobacterium, Burkholderia phytofirmans strain PsJN
Appl Environ Microbiol
Isolation and characterization of endophytic bacteria from the nickel hyperaccumulator plant Alyssum bertolonii
Microb Ecol
Response of spring rape to inoculation with plant growth-promoting rhizobacteria containing 1-aminocyclopropane-1-carboxylate deaminase depends on nutrient status of the plant
Can J Microbiol
Rhizosphere bacteria containing 1-aminocyclopropane-1-carboxylate deaminase increase yield of plants grown in drying soil via both local and systemic hormone signalling
New Phytol
Changes in extractability of Cr and Pb in a polycontaminated soil after bioaugmentation with microbial producers of biosurfactants, organic acids and siderophores
Water Air Soil Pollut
Plant growth-promoting bacteria that decrease heavy metal toxicity in plants
Can J Microbiol
Plant growth-promoting bacteria promote copper and iron translocation from root to shoot in alfalfa seedlings
J Plant Nutr
Cited by (892)
Changes induced by vesicular-arbuscular fungus Rhizophagus irregularis in aerial parts of Echinacea purpurea
2024, Scientia HorticulturaeRoot chemistry and microbe interactions contribute to metal(loid) tolerance of an aromatic plant – Vetiver grass
2024, Journal of Hazardous MaterialsAssessing heavy metal contamination in Amomum villosum Lour. fruits from plantations in Southern China: Soil-fungi-plant interactions
2024, Ecotoxicology and Environmental SafetyRoot-associated bacterial microbiome shaped by root selective effects benefits phytostabilization by Athyrium wardii (Hook.)
2024, Ecotoxicology and Environmental SafetyPoplar as a woody model for the phytomanagement of trace element contaminated soils
2024, Advances in Botanical Research