Inoculation with Metal-Mobilizing Plant-Growth-Promoting Rhizobacterium<i>Bacillus</i>sp. SC2b and Its Role in Rhizoremediation

Ma, Ying; Oliveira, Rui S.; Wu, Longhua; Luo, Yongming; Rajkumar, M.; Rocha, Inês; Freitas, Helena

doi:10.1080/15287394.2015.1051205

Cited by 74 publications

(22 citation statements)

References 41 publications

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“…have proven to be efficient and economical for the removal of toxic metals from both polluted aqueous solutions and soils ( Alluri et al, 2007 ; Ma et al, 2013 ). Recently, Ma et al (2015b) observed that the metal resistant Bacillus sp. SC2b was capable of adsorbing significant amounts of metals (e.g., Cd, Pb, and Zn) and bacterial inoculation ameliorated metal toxicity through biosorption, thus exhibiting a protective effect on host plant growth.…”

Section: Role Of Plant-microbe-metal Interactions In Phytoremediationmentioning

confidence: 99%

“…These results indicate that the two root associated AMF may adopt several mechanisms to trigger either metal mobilization or immobilization, therefore contributing directly to phytoextraction or phytostabilization processes ( Ma et al, 2011a ). In addition, plant growth promoting bacteria (PGPB) possessing single or multiple traits such as alleviation of metal toxicity (metal resistant bacteria), alteration of metal availability (metal immobilizing or mobilizing bacteria), production of siderophores [siderophores producing bacteria (SPB)], phytohormones [indole-3-acetic acid (IAA) producing bacteria] and biochelator (organic acid- or biosurfactants-producing bacteria), fixation of nitrogen [nitrogen fixing bacteria (NFB)], and solubilization of mineral nutrients (phosphate or potassium solubilizing bacteria) have been widely proposed as effective bioinoculants for microbe-assisted phytoremediation ( Ma et al, 2011a , 2015a , b , c ; Rajkumar et al, 2012 ; Ahemad and Kibret, 2014 ; Figure 2 ). Ma et al (2011a) have extensively reviewed the diversity and ecology of metal resistant PGPB and their potential as phytoremediation enhancing agents in metal contaminated soils.…”

Section: Introductionmentioning

confidence: 99%

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Biochemical and Molecular Mechanisms of Plant-Microbe-Metal Interactions: Relevance for Phytoremediation

Oliveira²,

et al. 2016

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Plants and microbes coexist or compete for survival and their cohesive interactions play a vital role in adapting to metalliferous environments, and can thus be explored to improve microbe-assisted phytoremediation. Plant root exudates are useful nutrient and energy sources for soil microorganisms, with whom they establish intricate communication systems. Some beneficial bacteria and fungi, acting as plant growth promoting microorganisms (PGPMs), may alleviate metal phytotoxicity and stimulate plant growth indirectly via the induction of defense mechanisms against phytopathogens, and/or directly through the solubilization of mineral nutrients (nitrogen, phosphate, potassium, iron, etc.), production of plant growth promoting substances (e.g., phytohormones), and secretion of specific enzymes (e.g., 1-aminocyclopropane-1-carboxylate deaminase). PGPM can also change metal bioavailability in soil through various mechanisms such as acidification, precipitation, chelation, complexation, and redox reactions. This review presents the recent advances and applications made hitherto in understanding the biochemical and molecular mechanisms of plant–microbe interactions and their role in the major processes involved in phytoremediation, such as heavy metal detoxification, mobilization, immobilization, transformation, transport, and distribution.

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Section: Role Of Plant-microbe-metal Interactions In Phytoremediationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Biochemical and Molecular Mechanisms of Plant-Microbe-Metal Interactions: Relevance for Phytoremediation

Oliveira²,

et al. 2016

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“…[50][51] The potential for R. leguminosarum and P. brassicacearum to enhance growth in inoculated B. juncea plants may be attributed to reported PGPB properties beneficial for plant growth, 27,52 including solubilization of phosphate and the production of indole acetic acid (IAA), ACC deaminase, and siderophores. [53][54][55] However, these PGPB properties were not examined in this study.…”

Section: Growth Parameters Under Different Zn Species and Bacterial Tmentioning

confidence: 99%

“…61 This suggests that different PGPBs elicit different responses that may also depend on the hyperaccumulator species. [54][55]…”

Section: Effects Of Zn Speciation and Bacteria On Zn Uptake And Transmentioning

confidence: 99%

Soil Bacteria Override Speciation Effects on Zinc Phytotoxicity in Zinc-Contaminated Soils

Adele

Ngwenya

Heal

et al. 2018

Environ. Sci. Technol.

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The effects of zinc (Zn) speciation on plant growth in Zn-contaminated soil in the presence of bacteria are unknown but are critical to our understanding of metal biodynamics in the rhizosphere where bacteria are abundant. A 6-week pot experiment investigated the effects of two plant growth promoting bacteria (PGPB), Rhizobium leguminosarum and Pseudomonas brassicacearum, on Zn accumulation and speciation in Brassica juncea grown in soil amended with 600 mg kg elemental Zn as three Zn species: soluble ZnSO and nanoparticles of ZnO and ZnS. Measures of plant growth were higher across all Zn treatments inoculated with PGPB compared to uninoculated controls, but Zn species effects were not significant. Transmission electron microscopy identified dense particles in the epidermis and intracellular spaces in roots, suggesting Zn uptake in both dissolved and particulate forms. X-ray absorption near-edge structure (XANES) analysis of roots revealed differences in Zn speciation between treatments. Uninoculated plants exposed to ZnSO contained Zn predominantly in the form of Zn phytate (35%) and Zn polygalacturonate (30%), whereas Zn cysteine (57%) and Zn polygalacturonate (37%) dominated in roots exposed to ZnO nanoparticles. Inoculation with PGPB increased (>50%) the proportion of Zn cysteine under all Zn treatments, suggesting Zn coordination with cysteine as the predominant mechanism of Zn toxicity reduction by PGPB. Using this approach, we show, for the first time, that although speciation is important, the presence of rhizospheric bacteria completely overrides speciation effects such that most of the Zn in plant tissue exists as complexes other than the original form.

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“…High levels of resistance to Cd (300 mg/L), Zn (730 mg/L), and Pb (1400 mg/L) were reported for a plant growth-promoting bacterial (PGPB) strain of Bacillus sp. (SC2b), which was isolated from the rhizosphere of Sedum plumbizincicola grown in Pb/Zn mine soils ( Ma et al, 2015 ).…”

Section: Rhizoremediation: the Combinatorial Effects Of Bio/phytoremementioning

confidence: 99%

Potential Biotechnological Strategies for the Cleanup of Heavy Metals and Metalloids

et al. 2016

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Global mechanization, urbanization, and various natural processes have led to the increased release of toxic compounds into the biosphere. These hazardous toxic pollutants include a variety of organic and inorganic compounds, which pose a serious threat to the ecosystem. The contamination of soil and water are the major environmental concerns in the present scenario. This leads to a greater need for remediation of contaminated soils and water with suitable approaches and mechanisms. The conventional remediation of contaminated sites commonly involves the physical removal of contaminants, and their disposition. Physical remediation strategies are expensive, non-specific and often make the soil unsuitable for agriculture and other uses by disturbing the microenvironment. Owing to these concerns, there has been increased interest in eco-friendly and sustainable approaches such as bioremediation, phytoremediation and rhizoremediation for the cleanup of contaminated sites. This review lays particular emphasis on biotechnological approaches and strategies for heavy metal and metalloid containment removal from the environment, highlighting the advances and implications of bioremediation and phytoremediation as well as their utilization in cleaning-up toxic pollutants from contaminated environments.

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Inoculation with Metal-Mobilizing Plant-Growth-Promoting RhizobacteriumBacillussp. SC2b and Its Role in Rhizoremediation

Cited by 74 publications

References 41 publications

Biochemical and Molecular Mechanisms of Plant-Microbe-Metal Interactions: Relevance for Phytoremediation

Biochemical and Molecular Mechanisms of Plant-Microbe-Metal Interactions: Relevance for Phytoremediation

Soil Bacteria Override Speciation Effects on Zinc Phytotoxicity in Zinc-Contaminated Soils

Potential Biotechnological Strategies for the Cleanup of Heavy Metals and Metalloids

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