Synergistic effect of organo-mineral amendments and plant growth-promoting rhizobacteria (PGPR) on the establishment of vegetation cover and amelioration of mine tailings

Benidire, Loubna; Madline, Atika; Pereira, Sofia I.A.; Castro, Paula M. L.; Boularbah, Ali

doi:10.1016/j.chemosphere.2020.127803

Cited by 59 publications

(33 citation statements)

References 90 publications

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“…This is due to the positive impact of nanophos on bacterial community which involved in mineralization of P and other minerals in soil [ 49 ]. Rhizobial inoculants improved the heterotropic and P solubilizers count, higher dehydrogenase and urease activity under rye grass cultivation [ 50 ]. Biofertilizers application such as Bacillus megaterium increases the phosphorus content up to 39.7% [ 51 , 52 ].…”

Section: Discussionmentioning

confidence: 99%

Impact of nanophos in agriculture to improve functional bacterial community and crop productivity

Chaudhary

Parveen

et al. 2021

BMC Plant Biol

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Background Since the World’s population is increasing, it’s critical to boost agricultural productivity to meet the rising demand for food and reduce poverty. Fertilizers are widely used in traditional agricultural methods to improve crop yield, but they have a number of negative environmental consequences such as nutrient losses, decrease fertility and polluted water and air. Researchers have been focusing on alternative crop fertilizers mechanisms to address these issues in recent years and nanobiofertilizers have frequently been suggested. “Nanophos” is a biofertilizer and contains phosphate-solubilising bacteria that solubilises insoluble phosphate and makes it available to the plants for improved growth and productivity as well as maintain soil health. This study evaluated the impact of nanophos on the growth and development of maize plants and its rhizospheric microbial community such as NPK solubilising microbes, soil enzyme activities and soil protein under field condition after 20, 40 and 60 days in randomized block design. Results Maize seeds treated with nanophos showed improvement in germination of seeds, plant height, number of leaves, photosynthetic pigments, total sugar and protein level over control. A higher activity of phenol, flavonoid, antioxidant activities and yield were noticed in nanophos treated plants over control. Positive shift in total bacterial count, nitrogen fixing bacteria, phosphate and potassium solubilizers were observed in the presence of nanophos as compared to control. Soil enzyme activities were significantly (P < 0.05) improved in treated soil and showed moderately correlation between treatments estimated using Spearman rank correlation test. Real time PCR and total soil protein content analysis showed enhanced microbial population in nanophos treated soil. Obtained results showed that nanophos improved the soil microbial population and thus improved the plant growth and productivity. Conclusion The study concluded a stimulating effect of nanophos on Zea mays health and productivity and indicates good response towards total bacterial, NPK solubilising bacteria, soil enzymes, soil protein which equally showed positive response towards soil nutrient status. It can be a potential way to boost soil nutrient use efficiency and can be a better alternative to fertilizers used in the agriculture.

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Section: Discussionmentioning

confidence: 99%

Impact of nanophos in agriculture to improve functional bacterial community and crop productivity

Chaudhary

Parveen

et al. 2021

BMC Plant Biol

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“…There have been several recent studies on the use of microorganisms to remediate sites polluted with metal combinations (e.g., Cameron, Mata & Riquelme, 2018 ; Choinska-Pulit, Sobolczyk-Benarek & Laba, 2018 ). Interestingly, co-inoculation approaches have proved successful when protecting alfalfa from Cu/Zn mixtures ( Jian et al, 2019 ), cleaning slurries containing heavy metal mixtures plus polycyclic aromatics ( Subashchandrabose et al., 2019 ), or phytoremediating mine tailings from a Cu, Fe, Zn, and sulfur extraction operation ( Benidire et al, 2021 ). Therefore, strain CH34 may be a good candidate to be used as a microbuial consortium member in co-inoculation schemes to take advantage of the beneficial properties and to prevent potential deleterious effects (Cillero et al submitted, Supplementary Material).…”

Section: Discussionmentioning

confidence: 99%

The multi metal-resistant bacterium Cupriavidus metallidurans CH34 affects growth and metal mobilization in Arabidopsis thaliana plants exposed to copper

Clavero-León

Ruiz

Cillero

et al. 2021

PeerJ

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Copper (Cu) is important for plant growth, but high concentrations can lead to detrimental effects such as primary root length inhibition, vegetative tissue chlorosis, and even plant death. The interaction between plant-soil microbiota and roots can potentially affect metal mobility and availability, and, therefore, overall plant metal concentration. Cupriavidus metallidurans CH34 is a multi metal-resistant bacterial model that alters metal mobility and bioavailability through ion pumping, metal complexation, and reduction processes. The interactions between strain CH34 and plants may affect the growth, metal uptake, and translocation of Arabidopsis thaliana plants that are exposed to or not exposed to Cu. In this study, we looked also at the specific gene expression changes in C. metallidurans when co-cultured with Cu-exposed A. thaliana. We found that A. thaliana’s rosette area, primary and secondary root growth, and dry weight were affected by strain CH34, and that beneficial or detrimental effects depended on Cu concentration. An increase in some plant growth parameters was observed at copper concentrations lower than 50 µM and significant detrimental effects were found at concentrations higher than 50 µM Cu. We also observed up to a 90% increase and 60% decrease in metal accumulation and mobilization in inoculated A. thaliana. In turn, copper-stressed A. thaliana altered C. metallidurans colonization, and cop genes that encoded copper resistance in strain CH34 were induced by the combination of A. thaliana and Cu. These results reveal the complexity of the plant-bacteria-metal triad and will contribute to our understanding of their applications in plant growth promotion, protection, and phytoremediation strategies.

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“…In addition to the high concentration of metals, sulfide mine wastes are often characterized by low organic matter and nutrient content, highly acidic pH, and poor physical structure (Wong 2003;Mendez et al 2008), which may hinder plant growth (Boularbah et al 2006a;Sheoran et al 2010;Benidire et al 2021) and negatively impact biological processes in soils (Benidire et al 2020(Benidire et al , 2021Tembo et al 2006;Navarro et al 2008). Therefore, lack of vegetation cover is frequent in mining sites, which explains why these areas are highly prone to erosion, leading to an increase in the dispersion of pollutants and a decrease of the natural resilience of contaminated ecosystems (Nicolau and Asensio 2000;Singh et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Remediation of metal-contaminated mine tailings by the application of organic and mineral amendments

et al. 2021

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Purpose Tailings are generally characterized by severe physicochemical conditions that limit the establishment of vegetation. The present study aimed to select suitable combinations of organo-mineral amendments to improve the physicochemical, biochemical, and biological properties of spolic technosols, highly contaminated with metals. Materials and methods Several substrates were prepared by mixing mine tailings (MT) of an abandoned mining area with non-contaminated agricultural soil (anthrosol), green waste compost, lime, and rock phosphate at different rates: S1 -50% of MT + 50% of agricultural soil; S2 -S1 + 3% of lime (CaCO 3 ); S3 -S1 + 6% of rock phosphate; S4 -S1 + 10% of compost; S5 -S1 + 10% of compost + 3% of lime; S6 -S1 + 10% of compost + 6% of rock phosphate. Untreated MT and agricultural soil were analyzed immediately, and 8 months after incorporating the amendments. Results and discussion Heterotrophic microorganisms were not recovered from untreated MT due to the highly acidic pH and available metal concentrations. However, the addition of organo-mineral amendments ameliorated the tailings' characteristics by increasing pH, conductivity, total organic carbon, and available P levels. Moreover, after 8 months, heterotrophic microorganisms were recovered from those substrates and dehydrogenase activity was enhanced. The incorporation of agricultural soil and green waste compost mixed either with lime (S5) or rock phosphate (S6) was the most effective treatment. Conclusions Both S5 and S6 mixtures successfully reduced the environmental risk posed by tailings, suggesting the potential use of these amendments for the remediation of pyrite mines.

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Synergistic effect of organo-mineral amendments and plant growth-promoting rhizobacteria (PGPR) on the establishment of vegetation cover and amelioration of mine tailings

Cited by 59 publications

References 90 publications

Impact of nanophos in agriculture to improve functional bacterial community and crop productivity

Impact of nanophos in agriculture to improve functional bacterial community and crop productivity

The multi metal-resistant bacterium Cupriavidus metallidurans CH34 affects growth and metal mobilization in Arabidopsis thaliana plants exposed to copper

Remediation of metal-contaminated mine tailings by the application of organic and mineral amendments

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