Screening of plant growth promoting traits in heavy metals resistant bacteria: Prospects in phytoremediation

Tirry, Nabil; Joutey, Nezha Tahri; Sayel, Hanane; Kouchou, Aziza; Bahafid, Wifak; Asri, Meryem; Ghachtouli, Naïma El

doi:10.1016/j.jgeb.2018.06.004

Cited by 135 publications

(44 citation statements)

References 63 publications

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“…All novel strains were able to produce siderophores, but strain DCY119 T was the strongest producer among the tested strains. Previous studies have demonstrated that the siderophores production activity of strains is directly correlated with enhanced HM resistance and indirectly promotion of plant growth by IAA production ability against HM toxicity [ 32 , 33 ].…”

Section: Resultsmentioning

confidence: 99%

Siderophore-producing rhizobacteria reduce heavy metal-induced oxidative stress in Panax ginseng Meyer

Huo

Kang

Ahn

et al. 2021

Journal of Ginseng Research

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Background Panax ginseng is one of the most important medicinal plants and is usually harvested after 5 to 6 years of cultivation in Korea. Heavy metal (HM) exposure is a type of abiotic stress that can induce oxidative stress and decrease the quality of the ginseng crop. Siderophore-producing rhizobacteria (SPR) may be capable of bioremediating HM contamination. Methods Several isolates from ginseng rhizosphere were evaluated by in vitro screening of their plant growth-promoting traits and HM resistance. Subsequently, in planta (pot tests) and in vitro (medium tests) were designed to investigate the SPR ability to reduce oxidative stress and enhance HM resistance in P. ginseng inoculated with the SPR candidate. Results In vitro tests revealed that the siderophore-producing Mesorhizobium panacihumi DCY119 T had higher HM resistance than the other tested isolates and was selected as the SPR candidate. In the planta experiments, 2-year-old ginseng seedlings exposed to 25 mL (500 mM) Fe solution had lower biomass and higher reactive oxygen species level than control seedlings. In contrast, seedlings treated with 10 8 CFU/mL DCY119 T for 10 minutes had higher biomass and higher levels of antioxidant genes and nonenzymatic antioxidant chemicals than untreated seedlings. When Fe concentration in the medium was increased, DCY119 T can produce siderophores and scavenge reactive oxygen species to reduce Fe toxicity in addition to providing indole-3-acetic acid to promote seedling growth, thereby conferring inoculated ginseng with HM resistance. Conclusions It was confirmed that SPR DCY119 T can potentially be used for bioremediation of HM contamination.

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Section: Resultsmentioning

confidence: 99%

Siderophore-producing rhizobacteria reduce heavy metal-induced oxidative stress in Panax ginseng Meyer

Huo

Kang

Ahn

et al. 2021

Journal of Ginseng Research

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“…PGPB enhance the growth of plants through various plant growth-promoting (PGP) traits (e.g., phosphate solubilization, production of indole-3-acetic acid, siderophores, ammonia, hydrogen cyanide and nitrogen fixation) [3][4][5][6]. In addition, they have the potential for metal detoxification and mitigation of plant's stress in polluted environment.…”

Section: Introductionmentioning

confidence: 99%

Genome Sequencing of Pantoea agglomerans C1 Provides Insights into Molecular and Genetic Mechanisms of Plant Growth-Promotion and Tolerance to Heavy Metals

et al. 2020

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Distinctive strains of Pantoea are used as soil inoculants for their ability to promote plant growth. Pantoea agglomerans strain C1, previously isolated from the phyllosphere of lettuce, can produce indole-3-acetic acid (IAA), solubilize phosphate, and inhibit plant pathogens, such as Erwinia amylovora. In this paper, the complete genome sequence of strain C1 is reported. In addition, experimental evidence is provided on how the strain tolerates arsenate As (V) up to 100 mM, and on how secreted metabolites like IAA and siderophores act as biostimulants in tomato cuttings. The strain has a circular chromosome and two prophages for a total genome of 4,846,925-bp, with a DNA G+C content of 55.2%. Genes related to plant growth promotion and biocontrol activity, such as those associated with IAA and spermidine synthesis, solubilization of inorganic phosphate, acquisition of ferrous iron, and production of volatile organic compounds, siderophores and GABA, were found in the genome of strain C1. Genome analysis also provided better understanding of the mechanisms underlying strain resistance to multiple toxic heavy metals and transmission of these genes by horizontal gene transfer. Findings suggested that strain C1 exhibits high biotechnological potential as plant growth-promoting bacterium in heavy metal polluted soils.

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“…The associated microbes can enhance host plant growth, increase solubility and bioavailability of contaminant and alter heavy metal accumulation through IAA, siderophores, organic acids and biosurfactant production (Li et al ., 2012a; Ullah et al ., 2015a,b; Tirry et al ., 2018). Moreover, microbes can indirectly enhance phytoremediation by stimulating soil microbial communities (Burges et al ., 2017).…”

Section: Discussionmentioning

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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Screening of plant growth promoting traits in heavy metals resistant bacteria: Prospects in phytoremediation

Cited by 135 publications

References 63 publications

Siderophore-producing rhizobacteria reduce heavy metal-induced oxidative stress in Panax ginseng Meyer

Siderophore-producing rhizobacteria reduce heavy metal-induced oxidative stress in Panax ginseng Meyer

Genome Sequencing of Pantoea agglomerans C1 Provides Insights into Molecular and Genetic Mechanisms of Plant Growth-Promotion and Tolerance to Heavy Metals

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

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