Potential of siderophore-producing bacteria for improving heavy metal phytoextraction

Rajkumar, M.; Ae, Noriharu; Prasad, M.N.V.; Freitas, Helena

doi:10.1016/j.tibtech.2009.12.002

Cited by 1,017 publications

(442 citation statements)

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“…However, chelators may be toxic to plants and to soil microorganisms (Evangelou et al 2007;Ultra et al 2005). A promising alternative is the utilization of plant-microbe interactions to improve the efficiency of phytoremediation, altering the mobility and bioavailability of metals in soils (Glick 2010;Ma et al 2011;Rajkumar et al 2010). …”

Section: Introductionmentioning

confidence: 99%

Rhizobacteria isolated from a metal-polluted area enhance plant growth in zinc and cadmium-contaminated soil

Pereira

Barbosa

Castro

2014

Int. J. Environ. Sci. Technol.

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In this work, we evaluated the ability of rhizobacteria isolated from a metal-contaminated site to produce plant growth-promoting substances, such as indole-3-acetic acid (IAA), ammonia, hydrogen cyanide, siderophores and extracellular enzymes, to solubilize phosphate and for 1-aminocyclopropane-1-carboxylate (ACC)-deaminase activity, while assessing their capacity to enhance Trifolium repens growth. The rhizobacteria that better performed were used as bioinoculants for plants grown in zinc-and cadmium-spiked soils. Rhizobacteria were inoculated onto white clover seedlings growing in 250 and 500 mg kg -1 of zinc and in 10 and 30 mg kg -1 of cadmium-spiked soils and plant traits determined. The available and exchangeable rhizosphere metal concentrations were analyzed. Twenty rhizobacteria stimulated white clover growth under axenic conditions. Overall, strains Rhodococcus erythropolis EC 34, Achromobacter sp. 1AP2 and Microbacterium sp. 3ZP2 increased clover biomass in the absence and in presence of metals; however, in soils with 250 mg kg -1 of zinc, bacterial inoculation did not enhance plant biomass. Biomass enhancement may be related to the multiple bacterial promoting traits, especially the production of high levels of IAA and siderophores and the activity of ACC-deaminase. To the best of our knowledge, this is the first study reporting the potential of R. erythropolis to increase plant growth in metal-contaminated soils. In general, strains Microbacterium sp. 3ZP2 and Arthrobacter sp. EC 10 enhanced the available and exchangeable metal concentrations in rhizosphere showing their potential to improve phytoremediation efficiency. This work clearly indicates that rhizobacteria are promising for the development of bioinoculants useful for phytoremediation of polluted soils.

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Section: Introductionmentioning

confidence: 99%

Rhizobacteria isolated from a metal-polluted area enhance plant growth in zinc and cadmium-contaminated soil

Pereira

Barbosa

Castro

2014

Int. J. Environ. Sci. Technol.

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“…Rapid and continuous worldwide industrialization, urbanization and modern agriculture practices have introduced excess of the heavy metals (HMs) into the soil. Due to their persistence in soil and their toxic nature, HMs adversely impact the ecosystem, agriculture, water quality, soil microbiota and human health (Rajkumar et al ., 2010; Kidd et al ., 2012; Wei et al ., 2014). To mitigate the negative effects of HMs, the remediation of contaminated soils is gaining considerable momentum.…”

Section: Introductionmentioning

confidence: 99%

“…Microbe‐assisted phytoremediation can effectively reduce this problem. For some microorganisms, it can effectively improve the plant growth by transformation of nutrient elements, production of phytohormones, or provide iron to reduce the deleterious effects of metal contamination to plants (Rajkumar et al ., 2010). …”

Section: Introductionmentioning

confidence: 99%

Endophytic fungal community of Dysphania ambrosioides from two heavy metal‐contaminated sites: evaluated by culture‐dependent and culture‐independent approaches

Parmar

et al. 2018

Microbial Biotechnology

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SummaryEndophytic fungal communities of Dysphania ambrosioides, a hyperaccumulator growing at two Pb‐Zn‐contaminated sites, were investigated through culture‐dependent and culture‐independent approaches. A total of 237 culturable endophytic fungi (EF) were isolated from 368 tissue (shoot and roots) segments, and the colonization rate (CR) ranged from 9.64% to 65.98%. The isolates were identified to 43 taxa based on morphological characteristics and rDNA ITS sequence analysis. Among them, 13 taxa (30.23%) were common in plant tissues from both sites; however, dominant EF were dissimilar. In culture‐dependent study, 1989 OTUs were obtained through Illumina Miseq sequencing, and dominant EF were almost same in plant tissues from both sites. However, some culturable EF were not observed in total endophytic communities. We suggest that combination of both culture‐dependent and culture‐independent methods will provide more chances for the precise estimation of endophytic fungal community than using either of them. The tissue had more influence on the culturable fungal community structure, whereas the location had more influence on the total fungal community structure (including culturable and unculturable). Both culture‐dependent and culture‐independent studies illustrated that endophytic fungal communities of D. ambrosioides varied across the sites, which suggested that HM concentration of the soil may have some influence on endophytic fungal diversity.

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“…Among major primary inorganic contaminants, heavy metals are the one, which accumulates in the environment and contaminate the food chain [1] due to their non-biodegradable nature.…”

Section: Introductionmentioning

confidence: 99%

Role of Plant Growth Promoting Rhizobacteria in Accumulation of Heavy Metal in Metal Contaminated Soil

Jha¹,

Subrmanian²,

Mishra³

2017

ELSR

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Heavy metal pollution by industrial, agricultural and municipal wastewater is a frequent phenomenon. Bioremediation is a biological process for cleaning up of pollutants from the environment. In the present study, B. megaterium and P. aeruginosa isolated from a weed Suaeda nudiflora at chemical polluted site from Ankleshwar, Gujarat was used for bioremediation. These isolates were characterized for their ability of metal assimilation like phosphorus and iron, and on the basis of their best assimilation ability, the isolates were selected for heavy metal tolerance like zinc and lead. B. megaterium and P. aeruginosa with highest heavy metal tolerance up to 200 mgl -1 were inoculated in maize plants by test tube inoculation method and analyzed for the growth promotion efficacy in heavy metal polluted soil. The plant inoculated with isolates showed 20% higher plant height, 20% longer root length and 5% greater dry weight as compared to non-inoculated control. Further analyses of leaves were carried out for the accumulation of heavy metal in maize. Results of the study showed positive growth response of maize on heavy metal polluted soil in green house condition and also accumulate a significant amount of zinc (587 mg kg−1) and lead (227 mg kg−1) in plants. The study concluded that the metal mobilizing PGPR could be used as an effective inoculant for improving the phytoremediation in multi-metal polluted soil, as well as for the reclamation of heavy metal polluted soil.

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Potential of siderophore-producing bacteria for improving heavy metal phytoextraction

Cited by 1,017 publications

References 70 publications

Rhizobacteria isolated from a metal-polluted area enhance plant growth in zinc and cadmium-contaminated soil

Rhizobacteria isolated from a metal-polluted area enhance plant growth in zinc and cadmium-contaminated soil

Endophytic fungal community of Dysphania ambrosioides from two heavy metal‐contaminated sites: evaluated by culture‐dependent and culture‐independent approaches

Role of Plant Growth Promoting Rhizobacteria in Accumulation of Heavy Metal in Metal Contaminated Soil

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