Isolation of Heavy Metal-Tolerant PGPR Strains and Amelioration of Chromium Effect in Wheat in Combination with Biochar

Mazhar, Roomina; Ilyas, Noshin; Arshad, Muhammad; Khalid, Azeem; Hussain, Mubashir

doi:10.1007/s40995-019-00800-7

Cited by 25 publications

(14 citation statements)

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“…Falguni) grown in pots treated with different levels of Cd. A similar trend was observed by [4], who found that PGPR strains (Bacillus) inoculated along with 1% biochar led to an ameliorated stress effect of Cr and the ability to improve the plant growth attributes of wheat.…”

Section: Pot Experiments 431 Plant Growth Analysissupporting

confidence: 82%

“…Heavy metal pollution is a serious environmental problem that negatively affects soil fertility and plant productivity and threatens human health [1,2]. It can also change the function and structure of an ecosystem owing to its stability and toxic nature [3,4]. Cadmium (Cd) is one of the toxic heavy metals discharged into the environment through fossil fuel combustion, mining, smelting, metal plating, Ni-Cd batteries, fungicides and pesticides, phosphate fertilizers, dyes, photographs, textile processes, stabilizers, and alloy manufacturing [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…The addition of biochar to the soil also increases the soil nutrient supply and microbial activity and decreases nutrient leaching [21,22], helping to improve the supply of essential macro-and micronutrients for plant growth [23]. This also improves the soil structure by increasing the porosity and aeration of the soil [24], boosting nutrient retention in the micropores of the soil [25], and reducing the toxicity of heavy metals such as Zn, Cu, Cd, and Ni in many plant species by several mechanisms including immobilization in the soil, pH modification, alterations in the redox state in the soil, and improvement of the biological properties [4,26].…”

Section: Introductionmentioning

confidence: 99%

“…Microorganisms can enhance the availability of heavy metals through solubilization and mobilization in the soil solution by decreased pH, which is called phytoremediation, or by chemical transformation of metal ions from toxic forms to nontoxic forms; thus, the plant uptake of minerals increases [2,4]. On the contrary, microorganisms can reduce the availability of metals by bioaccumulation (external and intracellular), immobilization, chelation, and active removal [2,27].…”

Section: Introductionmentioning

confidence: 99%

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The Combined Effect of Pseudomonas stutzeri and Biochar on the Growth Dynamics and Tolerance of Lettuce Plants (Lactuca sativa) to Cadmium Stress

et al. 2021

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Agricultural activities lead to the accumulation of cadmium (Cd) in the soil. It is necessary to identify effective and economical ways to reduce the soil Cd bioavailability. To achieve this, three bacterial strains, Pseudomonas stutzeri, P. koreensis, and P. fluorescens, were tested for tolerance and biosorption of different concentrations of Cd (0, 5, 10, 15, 20, and 25 mg L−1). During the 2020 and 2021 seasons, a pot experiment was conducted using four different soil amendments (control, biochar, P. stutzeri, and a combination) under four levels of Cd (0, 40, 80, and 120 mg kg−1) and assessing the effect on growth parameters, physiological modifications, antioxidant enzymes, and Cd accumulation in lettuce plants (Lactuca sativa cv. Balady). In vitro, the results showed that P. stutzeri was the most tolerant of Cd. Our findings in pot trials showed that T4 (biochar + P. stutzeri) was a more efficient treatment in terms of the growth parameters, with 452.00 g plant−1 was recorded for fresh weight, 40.10 g plant−1 for dry weight, 18.89 cm plant−1 for plant height, 6.03 cm2 for leaf area, and 20.48 for the number of leaves plant−1, while in terms of physiological characteristics, we recorded 1.29 mg g−1 FW, 0.35 μg g−1 FW, and 3.69 μg g−1 FW for total chlorophyll, carotenoids, and total soluble sugar, respectively; this was also reflected in the number of antioxidant enzymes and intensity of soil biological activities in soil treated with 120 mg kg−1 Cd compared with the control and other treatments in the first season. A similar trend was observed in the second season. Additionally, significantly lower Cd was observed in both the root (67%) and shoots (78%). Therefore, a combined application of biochar and P. stutzeri could be used as an alternative to mitigate Cd toxicity.

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Section: Pot Experiments 431 Plant Growth Analysissupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Combined Effect of Pseudomonas stutzeri and Biochar on the Growth Dynamics and Tolerance of Lettuce Plants (Lactuca sativa) to Cadmium Stress

et al. 2021

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“…To screen the effective PGPR strain ACC deaminase trait could be used as an efficient tool. It could be successfully used as biofertilizers which increase the growth of inoculated plants (Mazhar et al, 2020a;Wani et al, 2015). In the soil, the high levels of heavy metals decrease the microbial activity and it affects the production of crop by getting accumulated in plant organs.…”

Section: Significance Of Rhizobacteria In Phytoremediationmentioning

confidence: 99%

Role of Rhizobacteria in Phytoremediation of Heavy Metals

Nadeem

Asif

Ayyub

et al. 2020

Biol Clin Sci Res J

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Rhizobacteria, a plant growth promoting rhizobacteria (PGPR) as beneficial microorganism which helps in defense from abiotic and abiotic stresses, colonizes in rhizosphere and played a major role in promoting plant growth and also provides enhance soil fertility. In the highly contaminated soil, the content of metal exceeds the limits of plant tolerance. It is also possible that treatment of plant with PGPR, here increasing the biomass of plant, stabilizing and the remediation of metal polluted soil. The use of rhizobacteria plays and important role in increasing the tolerance of plant towards toxic effects of heavy metals like arsenic, sulphur, mercury, chromium, cadmium, nickel, lead and copper etc. Heavy metal accumulation results in deterioration of soil fertility while PGPR helps to restore soil fertility. The process of phytoremediation has been proved to be the best way to remediate heavy metals from soil. The use of rhizobacteria with plants provides highly efficiency phytoremediation. However, there is still need to understanding the concept of microbial ecological study in rhizosphere and mechanism of detoxification of heavy metals form rhizosphere.

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