Characterization of plant growth-promoting bacteria isolated from the rhizosphere of Robinia pseudoacacia growing in metal-contaminated mine tailings in eastern Morocco

Bennis, Meryeme; Perez-Tapia, Vicente; Alami, Soufiane; Bouhnik, Omar; Lamin, Hanane; Abdelmoumen, Hanaa; Bedmar, Eulogio J.; Idrissi, Mustapha Missbah El

doi:10.1016/j.jenvman.2021.114321

Cited by 20 publications

(12 citation statements)

References 91 publications

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“…Hence, the germination investigation in this study also confirmed the best germination capacity of black locust seeds after scarification treatment, similar to recently reported results within the specialized literature, with GR up to and above 95% [9,17,48]. Even so, these authors found that there were no significant differences in GR between scarification treatments, with preliminary tests suggesting that mechanical scarification provided the highest germination rates, as observed in many other Fabaceae species [18].…”

Section: Discussionsupporting

confidence: 91%

From Seed to Seedling: Influence of Seed Geographic Provenance and Germination Treatments on Reproductive Material Represented by Seedlings of Robinia pseudoacacia

et al. 2022

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The influence of the geographical origin of eight Romanian provenances of Robinia pseudoacacia on the characteristics of seeds, germination, and growth of seedlings in young stages of life was analyzed. Four experiments were undertaken to test seed germination (thermal treatment at distinct temperatures, mechanical scarification, acetone 90%, and biostimulator). The germination percentage showed that scarification treatment provided the best results among all treatments (41.7%). Seeds soaked in water at 100 °C provided the second-highest germination rate. Furthermore, the same two treatments also assured the highest values for the seedlings’ length. There were registered significant differences among the provenances for the analyzed characteristics, the seed germination capacity, and the growth rate of the seedlings in the first years of life. The study highlighted the resources that could ensure good quality of the reproductive forest material, which can be used in new afforestation and breeding programs. Pearson correlations and multivariate analysis provided interesting and useful information about R. pseudoacacia provenances and 13 characteristics of the seeds and seedlings, highlighting the relationship among them. The results could be of interest for the efficient use of forest genetic resources and the obtention of quality reproductive material in black locust.

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Section: Discussionsupporting

confidence: 91%

From Seed to Seedling: Influence of Seed Geographic Provenance and Germination Treatments on Reproductive Material Represented by Seedlings of Robinia pseudoacacia

et al. 2022

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“…For example, the lead (Pb) immobilization potential of phosphate solubilizing bacteria isolated from heavy metal contaminated soils was reported previously 18 . Metal resistant and plant growth‐promoting bacteria were previously isolated from gold mining soil, coal dumping, and metal‐contaminated mine tailings 19–21 . Likewise, Jain et al 3 linked bacteria isolated from the rhizosphere of B. monnieri with nutrient mineralization and contaminant degradation in acidic mine‐affected soil.…”

Section: Introductionmentioning

confidence: 99%

“…18 Metal resistant and plant growth-promoting bacteria were previously isolated from gold mining soil, coal dumping, and metal-contaminated mine tailings. [19][20][21] Likewise, Jain et al 3 linked bacteria isolated from the rhizosphere of B. monnieri with nutrient mineralization and contaminant degradation in acidic mine-affected soil.…”

Section: Introductionmentioning

confidence: 99%

Sustainable phytoremediation of highly acidic mine spoil through economical valuable crop Pelargonium graveolens L

Jain

Yadav

Mishra

et al. 2022

Env Prog and Sustain Energy

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The phytostabilization of acid mine spoil by industrially important aromatic crops could be a sustainable solution with minimum input for the problem associated with acidic mine spoil-affected areas. In the present study, the suitability of Pelargonium graveolens for phytostabilization of acidic mine spoil has been investigated in three different combinations (T1: 100% soil; T2: 100% mine spoil, T3: 75 mine spoil: 25 soil and T4: 50 mine spoil: 50 soil). The plant growth performance, metal accumulation, ecological indices, soil properties, enzymes, and microbial diversity along with the identification of dominant bacterial isolates were investigated in the study. The results indicated that mine spoil was highly acidic (pH 3.01) and rich in minerals and toxic metals. The values of the tolerance index and oil content of P. graveolens L under different treatments varied from 43% to 89% and from 0.10 to 0.13% without affecting oil quality, respectively. Bioconcentration (BCF) and translocation factor (TF) indicated that the P. graveolens can be used as a phyto-excluder for Al, Fe, Cr, Zn, and Pb and phytoextractor for Cu, Ni, and Mn. The plantation of P. graveolens enhanced the microbial biomass and enzymatic activities of soil and immobilized the metals. The increase in the Shannon index from 1.67-1.86 to 1.9-2.61 suggested enhanced bacterial diversity after plantation. The identify bacterial isolates were metal tolerant and plant growth promoters. The study suggested that P. graveolens is suitable for the phytostabilization purpose of acidic mine spoils along with the economic return.

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“…Inorganic contaminants, such as heavy metals, can only be removed by extraction and transformation. In fact, several studies suggest using metal-resistant plants in association with rhizobacteria for phyto-stabilization purposes, aimed to limit the mobility of heavy metals (Bennis et al, 2022). On the other hand, organic contaminants such as hydrocarbons and chlorinated compounds can be removed by degradation, rhizoremediation, stabilization, and volatilization (Vocciante et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Ecological indicators and biological resources for hydrocarbon rhizoremediation in a protected area

Melzi,

Zecchin,

Gomarasca

et al. 2024

Front. Bioeng. Biotechnol.

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Spillage from oil refineries, pipelines, and service stations consistently leads to soil, food and groundwater contamination. Bacterial-assisted phytoremediation is a non-invasive and sustainable solution to eliminate or decrease the concentration of xenobiotic contaminants in the environment. In the present study, a protected area interested by a fuel discharge was considered to assess a bioremediation intervention. From the spill point, a plume of contamination flowed South-West into the aquifer, eventually reaching a wetland area. Soils, groundwaters and plants belonging to the species Scirpus sylvaticus (L.) were sampled. In the majority of the soil samples, concentrations of total petroleum hydrocarbons, both C ≤ 12 and C > 12, exceeded legal limits set forth in Directive 2000/60/EC. The analysis of diatom populations, used as ecological indicators, evidenced morphology alterations and the presence of Ulnaria ulna and Ulnaria biceps species, previously detected in hydrocarbon-polluted waters. Tests for phytotoxicity and phytodegradation, carried out in soil mesocosms, planted with Zea mays and Helianthus annuus, demonstrated that both species significantly contributed to the removal of total petroleum hydrocarbons. Removal of C ≤ 12 and C > 12 petroleum hydrocarbons was in the range of 80%–82% for Z. mays and 71%–72% for H. annuus. Microbial communities inhabiting high organic carbon and vegetated soils were more active in hydrocarbon degradation than those inhabiting subsoils, as evidenced by soil slurry experiments. The abundance of functional genes encoding toluene-benzene monooxygenase (tbmD) and alkane hydroxylase (alkB), quantified in environmental samples, confirmed that the plant rhizosphere recruited a microbial community with higher biodegradation capacity. Bacterial strains isolated from the sampling site were able to grow on model hydrocarbons (hexane, hexadecane and o-, m-, p-xylene) as sole carbon and energy sources, indicating that a natural bio-attenuation process was on-going at the site. The bacterial strains isolated from rhizosphere soil, rhizoplane and endosphere showed plant growth promoting traits according to in vitro and in vivo tests on Z. mays and Oryza sativa, allowing to forecast a possible application of bacterial assisted rhizoremediation to recover the protected area.

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Characterization of plant growth-promoting bacteria isolated from the rhizosphere of Robinia pseudoacacia growing in metal-contaminated mine tailings in eastern Morocco

Cited by 20 publications

References 91 publications

From Seed to Seedling: Influence of Seed Geographic Provenance and Germination Treatments on Reproductive Material Represented by Seedlings of Robinia pseudoacacia

From Seed to Seedling: Influence of Seed Geographic Provenance and Germination Treatments on Reproductive Material Represented by Seedlings of Robinia pseudoacacia

Sustainable phytoremediation of highly acidic mine spoil through economical valuable crop Pelargonium graveolens L

Ecological indicators and biological resources for hydrocarbon rhizoremediation in a protected area

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