Physiological responses to cadmium, copper, lead, and zinc of Sinorhizobium sp. strains nodulating Medicago sativa grown in Tunisian mining soils

Zribi, Kais; Djébali, Naceur; Mrabet, Moncef; Khayat, Nabiha; Smaoui, Abderrazak; Mlayah, Ammar; Aouani, Mohamed Elarbi

doi:10.1007/s13213-011-0358-7

Cited by 22 publications

(25 citation statements)

References 28 publications

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“…Prospection and isolation of heavy metal resistant soil bacteria The tested soil samples were near mining sites or an old mine that were being used as an agricultural zone, even though the lead contamination was the most important. This result supports a previous analysis reported by [24].…”

Section: Discussionsupporting

confidence: 94%

“…The tested soil bacteria had sensitivity to copper that was similar to that of other strains reported in the literature, such as Sinorhizobium or copper resistant A. tumefaciens , which can tolerate up to 2 mM Cu . In fact, the resistance level of bacteria could be based on the differences in the types of media and growth conditions used .…”

Section: Discussionsupporting

confidence: 76%

“…In this study, A. tumefaciens and R. aquatilis were more tolerant to Pb than Bradyrhizobium sp. [1] and Sinorhizobium [24] which can grow in media containing up to 2 mM, whereas the Pseudomonas strains isolated in our collection were less tolerant to Pb than those reported in the work of [1].…”

Section: Discussioncontrasting

confidence: 64%

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Identification of effective Pb resistant bacteria isolated from Lens culinaris growing in lead contaminated soils

Jebara

Abdelkerim

Fatnassi

et al. 2014

J. Basic Microbiol.

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Soil bacteria are a new phytoremediation system for the removal of heavy metals from soils. In this study, fifteen soil bacteria were isolated from root nodules of lentil growing in heavy metals contaminated soils, particularly by lead. Molecular characterization of the collection showed a large diversity, including Agrobacterium tumefaciens, Rahnella aquatilis, Pseudomonas, and Rhizobium sp. These soil bacteria had a wide range of tolerance to heavy metals. Among them, strains of A. tumefaciens and R. aquatilis tolerated up to 3.35 mM Pb; whereas Pseudomonas tolerated up to 3.24 mM Pb. The inoculation of lentil grown hydroponically with inoculums formed by these efficient and Pb resistant bacteria enhanced plant biomass. The treatment of this symbiosis by 1 mM Pb for 10 days or by 2 mM Pb for 3 days demonstrated that lentil had Pb accumulation capacity and can be considered a Pb accumulator plant, elsewhere, roots accumulated more Pb than shoots, and the inoculation decreased the Pb up take by the plants, suggesting that this symbiosis should be investigated for use in phytostabilization of Pb-contaminated soils. At the same time, a modulation in the antioxidant enzyme activity and a specific duration was required for the induction of the superoxide dismutase (SOD), peroxidase (POX), and ascorbate peroxidase (APX) response and to adapt to Pb stress. These results suggested that these enzymes may be involved in the main mechanism of antioxidative defense in lentil exposed to Pb oxidative stress.

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Section: Discussionsupporting

confidence: 94%

Section: Discussionsupporting

confidence: 76%

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Identification of effective Pb resistant bacteria isolated from Lens culinaris growing in lead contaminated soils

Jebara

Abdelkerim

Fatnassi

et al. 2014

J. Basic Microbiol.

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“…The results of this study agree with the previous report of Zribi et al . (), who found that Sinorhizobium sp. was able to survive 25 and 50 μ m Cu, while 20% of growth was inhibited by Cu concentrations between 100 and 600 μ m .…”

Section: Discussionmentioning

confidence: 97%

“…; Zribi et al . ; Khan & Lee ). The plant growth‐promoting bacteria living in soil may be able to reduce susceptibility to heavy metal toxicity (Gupta et al .…”

Section: Introductionmentioning

confidence: 96%

Enterobacter asburiae KE17 association regulates physiological changes and mitigates the toxic effects of heavy metals in soybean

et al. 2015

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This study aimed to elucidate the role played by Enterobacter asburiae KE17 in the growth and metabolism of soybeans during copper (100 μm Cu) and zinc (100 μm Zn) toxicity. When compared to controls, plants grown under Cu and Zn stress exhibited significantly lower growth rates, but inoculation with E. asburiae KE17 increased growth rates of stressed plants. The concentrations of plant hormones (abscisic acid and salicylic acid) and rates of lipid peroxidation were higher in plants under heavy metal stress, while total chlorophyll, carotenoid content and total polyphenol concentration were lower. While the bacterial treatment reduced the abscisic acid and salicylic acid content and lipid peroxidation rate of Cu-stressed plants, it also increased the concentration of photosynthetic pigments and total polyphenol. Moreover, the heavy metals induced increased accumulation of free amino acids such as aspartic acid, threonine, serine, glycine, alanine, leucine, isoleucine, tyrosine, proline and gamma-aminobutyric acid, while E. asburiae KE17 significantly reduced concentrations of free amino acids in metal-affected plants. Co-treatment with E. asburiae KE17 regulated nutrient uptake by enhancing nitrogen content and inhibiting Cu and Zn accumulation in soybean plants. The results of this study suggest that E. asburiae KE17 mitigates the effects of Cu and Zn stress by reprogramming plant metabolic processes.

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Beneficial Role of Plant Growth-Promoting Rhizobacteria in Bioremediation of Heavy Metal(loid)-Contaminated Agricultural Fields

Pramanik

Banerjee

Mukherjee

et al. 2021

Advances in Environmental Microbiology

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Physiological responses to cadmium, copper, lead, and zinc of Sinorhizobium sp. strains nodulating Medicago sativa grown in Tunisian mining soils

Cited by 22 publications

References 28 publications

Identification of effective Pb resistant bacteria isolated from Lens culinaris growing in lead contaminated soils

Identification of effective Pb resistant bacteria isolated from Lens culinaris growing in lead contaminated soils

Enterobacter asburiae KE17 association regulates physiological changes and mitigates the toxic effects of heavy metals in soybean

Beneficial Role of Plant Growth-Promoting Rhizobacteria in Bioremediation of Heavy Metal(loid)-Contaminated Agricultural Fields

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