Potential applications of Pseudomonas sp. (strain CPSB21) to ameliorate Cr6+ stress and phytoremediation of tannery effluent contaminated agricultural soils

Gupta, Pratishtha; Rani, Rupa; Chandra, Avantika; Kumar, Vipin

doi:10.1038/s41598-018-23322-5

Cited by 81 publications

(21 citation statements)

References 49 publications

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“…The higher antioxidant enzyme activity with ZTB strains inoculation in the present study might be due to the increased expression of plant antioxidant enzymes compare to un-inoculated plants. These finding were very well supported by the previously published research where the bacterial inoculation activates the gene expression profile of metal detoxifying enzymes to cope up the metal stress 6,26,27,36,37 .…”

Section: Discussionsupporting

confidence: 83%

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Zinc tolerant plant growth promoting bacteria alleviates phytotoxic effects of zinc on maize through zinc immobilization

Jain

Kour

Bhojiya

et al. 2020

Sci Rep

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the increasing heavy metal contamination in agricultural soils has become a serious concern across the globe. The present study envisages developing microbial inoculant approach for agriculture in Zn contaminated soils. Potential zinc tolerant bacteria (ZTB) were isolated from zinc (Zn) contaminated soils of southern Rajasthan, India. Isolates were further screened based on their efficiency towards Zn tolerance and plant growth promoting activities. Four strains viz. ZTB15, ZTB24, ZTB28 and ZTB29 exhibited high degree of tolerance to Zn up to 62.5 mM. The Zn accumulation by these bacterial strains was also evidenced by AAS and SEM-EDS studies. Assessment of various plant growth promotion traits viz., iAA, GA 3 , nH 3 , Hcn, siderophores, Acc deaminase, phytase production and p, K, Si solubilization studies revealed that these ZTB strains may serve as an efficient plant growth promoter under in vitro conditions. Gluconic acid secreted by ZTB strains owing to mineral solubilization was therefore confirmed using high performance liquid chromatography. A pot experiment under Zn stress conditions was performed using maize (Zea mays) variety (FEM-2) as a test crop. Zn toxicity reduced various plant growth parameters; however, inoculation of ZTB strains alleviated the Zn toxicity and enhanced the plant growth parameters. The effects of Zn stress on antioxidant enzyme activities in maize under in vitro conditions were also investigated. An increase in superoxide dismutase, peroxidase, phenylalanine ammonia lyase, catalase and polyphenol oxidase activity was observed on inoculation of ZTB strains. Further, ZIP gene expression studies revealed high expression in the ZIP metal transporter genes which were declined in the ZTB treated maize plantlets. The findings from the present study revealed that ZtB could play an important role in bioremediation in Zn contaminated soils.

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Section: Discussionsupporting

confidence: 83%

“…The Zn 2+ concentration in the pots was maintained to 1,000 mg Zn/ kg planting mixture. The experimental setup was designed as per previous studies by Gupta et al 37 . The pots containing Zn contaminated soil were left for two weeks for stabilization of Zn.…”

Section: Scanning Electron Microscopy-energy Dispersive Spectroscopy mentioning

confidence: 99%

Zinc tolerant plant growth promoting bacteria alleviates phytotoxic effects of zinc on maize through zinc immobilization

Jain

Kour

Bhojiya

et al. 2020

Sci Rep

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“…), on energy crops grown in TEcontaminated soils is shown in Table 5. Bioinoculation can increase plant growth in contaminated soils, leading to biomass values similar to those reported for uncontaminated soils (Gupta et al, 2018). However, the effects of bacterial inoculation on plant growth and TE accumulation depend on many factors including strain selection, type and availability of TE, plant species/cultivar, and soil properties (Montalbán et al, 2017;Saran et al, 2020).…”

Section: Pgpbmentioning

confidence: 72%

“…The deployment of efficient bacterial strains can greatly benefit phytomanagement strategies by reducing the harmful effects of hazardous TE levels on the growth of energy plants, including annual (Moreira et al, 2014(Moreira et al, , 2016a(Moreira et al, , 2016b(Moreira et al, , 2019Gupta et al, 2018;Rosenkranz et al, 2018;Saran et al, 2020), perennial (Babu et al, 2015;Itusha et al, 2019) and woody crops (Wang et al, 2011;Cocozza et al, 2015;Janssen et al, 2015). A non-exhaustive list of the beneficial effects of PGPB, belonging to a large variety of genera (e.g., Pseudomonas, Bacillus, Psychrobacter, Ralstonia, Chryseobacterium, Klebsiella, Aeromonas, etc.…”

Section: Pgpbmentioning

confidence: 99%

Phytomanagement of Metal(loid)-Contaminated Soils: Options, Efficiency and Value

Moreira

Pereira

Mench

et al. 2021

Front. Environ. Sci.

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The growing loss of soil functionality due to contamination by metal(loid)s, alone or in combination with organic pollutants, is a global environmental issue that entails major risks to ecosystems and human health. Consequently, the management and restructuring of large metal(loid)-polluted areas through sustainable nature-based solutions is currently a priority in research programs and legislation worldwide. Over the last few years, phytomanagement has emerged as a promising phytotechnology, focused on the use of plants and associated microorganisms, together with ad hoc site management practices, for an economically viable and ecologically sustainable recovery of contaminated sites. It promotes simultaneously the recovery of soil ecological functions and the decrease of pollutant linkages, while providing economic revenues, e.g. by producing non-food crops for biomass-processing technologies (biofuel and bioenergy sector, ecomaterials, biosourced-chemistry, etc.), thus contributing to the international demand for sustainable and renewable sources of energy and raw materials for the bioeconomy. Potential environmental benefits also include the provision of valuable ecosystem services such as water drainage management, soil erosion deterrence, C sequestration, regulation of nutrient cycles, xenobiotic biodegradation, and metal(loid) stabilization. Phytomanagement relies on the proper selection of (i) plants and (ii) microbial inoculants with the capacity to behave as powerful plant allies, e.g., PGPB: plant growth-promoting bacteria and AMF: arbuscular mycorrhizal fungi. This review gives an up-to-date overview of the main annual, perennial, and woody crops, as well as the most adequate cropping systems, presently used to phytomanage metal(loid)-contaminated soils, and the relevant products and ecosystems services provided by the various phytomanagement options. Suitable bioaugmentation practices with PGPB and AMF are also discussed. Furthermore, we identify the potential interest of phytomanagement for stakeholders and end-users and highlight future opportunities boosted by an effective engagement between environmental protection and economic development. We conclude by presenting the legal and regulatory framework of soil remediation and by discussing prospects for phytotechnologies applications in the future.

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“…The metabolic capabilities of microorganisms make them potentially useful for augmentative bioremediation of agricultural soils contaminated with heavy metals or organic pollutants, e.g., chemical pesticides [ 14 , 15 ]. Additionally, an improved understanding of the capacity of some fungi and bacteria to degrade mycotoxins (reviewed by Taheur et al [ 16 ]) has provoked interest in applying microorganisms to crop produce for detoxification purposes [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Reaping the Benefits of Microorganisms in Cropping Systems: Is the Regulatory Policy Adequate?

2021

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Within food plant cropping systems, microorganisms provide vital functions and ecosystem services, such as biological pest and disease control, promotion of plant growth and crop quality, and biodegradation of organic matter and pollutants. The beneficial effects of microorganisms can be achieved and/or enhanced by agricultural management measures that target the resident microbial biodiversity or by augmentation with domesticated and propagated microbial strains. This study presents a critical review of the current legislation and regulatory policies pertaining to the utilization of plant-beneficial microorganisms in the European Union (EU). For augmentative approaches, the nature of the intended effect and the product claim determine how a microbiological product is categorized and regulated, and pre-market authorization may be mandatory. Typically, microbial products have been incorporated into frameworks that were designed for evaluating non-living substances, and are therefore not well suited to the specific properties of live microorganisms. We suggest that regulatory harmonization across the sector could stimulate technical development and facilitate implementation of crop management methods employing microorganisms. Possible scenarios for regulatory reform in the longer term are discussed, but more investigation into their feasibility is needed. The findings of this study should serve as a catalyst for more efficient future use of plant-beneficial microorganisms, to the benefit of agriculture as well as the environment.

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Potential applications of Pseudomonas sp. (strain CPSB21) to ameliorate Cr6+ stress and phytoremediation of tannery effluent contaminated agricultural soils

Cited by 81 publications

References 49 publications

Zinc tolerant plant growth promoting bacteria alleviates phytotoxic effects of zinc on maize through zinc immobilization

Zinc tolerant plant growth promoting bacteria alleviates phytotoxic effects of zinc on maize through zinc immobilization

Phytomanagement of Metal(loid)-Contaminated Soils: Options, Efficiency and Value

Reaping the Benefits of Microorganisms in Cropping Systems: Is the Regulatory Policy Adequate?

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