Microbial biofilm ecology, in silico study of quorum sensing receptor-ligand interactions and biofilm mediated bioremediation

Balan, Biji; Dhaulaniya, Amit S.; Varma, Diksha A; Sodhi, Kushneet Kaur; Kumar, Mohit; Tiwari, Manisha; Singh, Dileep Kumar

doi:10.1007/s00203-020-02012-9

Cited by 32 publications

(18 citation statements)

References 146 publications

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“…Biosorption consists in attachment of metal cations to the cellular surface, because it is generally negatively charged for the presence of several anionic functional groups. Exopolysaccharides (EPS) and humic acids can also be released from the cell and help HM acquisition [ 36 , 60 , 69 ].…”

Section: Heavy Metal Bacterial Resistancementioning

confidence: 99%

“…EPS are macromolecules with a polysaccharidic central structure and variable side chains [ 76 ]. They are released outside bacterial cells and are the main component in the biofilm matrix [ 69 ]. EPS are involved in bacterial–plant interactions, such as host specificity, symbiosis and plant defense toward stress; moreover, EPS production is considered a PGP trait [ 18 ].…”

Section: Plant–bacteria Interactions In Rhizosphere and Defense From Heavy Metal Stressmentioning

confidence: 99%

“…Biofilm and EPS are widely used for bioremediation of several contaminants and their action in HM removal has been thoroughly investigated [ 69 , 76 ]. Combining current knowledge of EPS with phytoremediation could improve bioremediation effectiveness.…”

Section: Plant–bacteria Interactions In Rhizosphere and Defense From Heavy Metal Stressmentioning

confidence: 99%

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Rhizosphere Microbial Communities and Heavy Metals

2021

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The rhizosphere is a microhabitat where there is an intense chemical dialogue between plants and microorganisms. The two coexist and develop synergistic actions, which can promote plants’ functions and productivity, but also their capacity to respond to stress conditions, including heavy metal (HM) contamination. If HMs are present in soils used for agriculture, there is a risk of metal uptake by edible plants with subsequent bioaccumulation in humans and animals and detrimental consequences for their health. Plant productivity can also be negatively affected. Many bacteria have defensive mechanisms for resisting heavy metals and, through various complex processes, can improve plant response to HM stress. Bacteria-plant synergic interactions in the rhizosphere, as a homeostatic ecosystem response to HM disturbance, are common in soil. However, this is hard to achieve in agroecosystems managed with traditional practices, because concentrating on maximizing crop yield does not make it possible to establish rhizosphere interactions. Improving knowledge of the complex interactions mediated by plant exudates and secondary metabolites can lead to nature-based solutions for plant health in HM contaminated soils. This paper reports the main ecotoxicological effects of HMs and the various compounds (including several secondary metabolites) produced by plant-microorganism holobionts for removing, immobilizing and containing toxic elements.

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Section: Heavy Metal Bacterial Resistancementioning

confidence: 99%

Section: Plant–bacteria Interactions In Rhizosphere and Defense From Heavy Metal Stressmentioning

confidence: 99%

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Rhizosphere Microbial Communities and Heavy Metals

2021

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“…These structures are composed of bacterial cells associated with the soil surface and embedded in an extracellular polymer that promotes cell adhesion and survival (Cai et al ., 2019). Soil biofilms are described as dynamic in space and time, promoting intensive intra‐ and inter‐bacterial species interactions that result in increased rates of several processes, such as the degradation of soil organic matter (Balan et al ., 2021), the exchange of signals and metabolites, and the improvement of nutrient and oxygen availability (Amaya‐Gómez et al ., 2015; Madsen et al ., 2016).…”

Section: Introductionmentioning

confidence: 99%

Sculpting the soil microbiota

et al. 2021

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SUMMARY Soil is a living ecosystem, the health of which depends on fine interactions among its abiotic and biotic components. These form a delicate equilibrium maintained through a multilayer network that absorbs certain perturbations and guarantees soil functioning. Deciphering the principles governing the interactions within soils is of critical importance for their management and conservation. Here, we focus on soil microbiota and discuss the complexity of interactions that impact the composition and function of soil microbiota and their interaction with plants. We discuss how physical aspects of soils influence microbiota composition and how microbiota–plant interactions support plant growth and responses to nutrient deficiencies. We predict that understanding the principles determining the configuration and functioning of soil microbiota will contribute to the design of microbiota‐based strategies to preserve natural resources and develop more environmentally friendly agricultural practices.

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“…Nevertheless, several cellular mechanisms including synthesis of specific enzymes and action of cytoplasmic or membrane proteins were shown to express in the living bacterial biofilms ( Kumar et al, 2007 ). Therefore, instead of free-living planktonic bacteria/dead bacterial biofilms, growing (living) bacterial biofilms have been appreciated for several bacterial-dominated processes and recommended for the removal of heavy metals from the environment ( Singh et al, 2006 ; Pal and Paul, 2008 ; Edwards and Kjellerup, 2013 ; Meliani and Bensoltane, 2016 ; Balan et al, 2020 ).…”

Section: Introductionmentioning

confidence: 99%

Biofilm Formation, Production of Matrix Compounds and Biosorption of Copper, Nickel and Lead by Different Bacterial Strains

et al. 2021

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Bacterial biofilms play a key role in metal biosorption from wastewater. Recently, Enterobacter asburiae ENSD102, Enterobacter ludwigii ENSH201, Vitreoscilla sp. ENSG301, Acinetobacter lwoffii ENSG302, and Bacillus thuringiensis ENSW401 were shown to form air–liquid (AL) and solid–air–liquid (SAL) biofilms in a static condition at 28 and 37°C, respectively. However, how environmental and nutritional conditions affect biofilm formation; production of curli and cellulose; and biosorption of copper (Cu), nickel (Ni), and lead (Pb) by these bacteria have not been studied yet. In this study, E. asburiae ENSD102, E. ludwigii ENSH201, and B. thuringiensis ENSW401 developed the SAL biofilms at pH 8, while E. asburiae ENSD102 and Vitreoscilla sp. ENSG301 constructed the SAL biofilms at pH 4. However, all these strains produced AL biofilms at pH 7. In high osmolarity and ½-strength media, all these bacteria built fragile AL biofilms, while none of these strains generated the biofilms in anaerobic conditions. Congo red binding results showed that both environmental cues and bacterial strains played a vital role in curli and cellulose production. Calcofluor binding and spectrophotometric results revealed that all these bacterial strains produced significantly lesser amounts of cellulose at 37°C, pH 8, and in high osmotic conditions as compared to the regular media, at 28°C, and pH 7. Metal biosorption was drastically reduced in these bacteria at 37°C than at 28°C. Only Vitreoscilla sp. ENSG301 and B. thuringiensis ENSW401 completely removed (100%) Cu and Ni at an initial concentration of 12.5 mg l–1, while all these bacteria totally removed (100%) Pb at concentrations of 12.5 and 25 mg l–1 at pH 7 and 28°C. At an initial concentration of 100 mg l–1, the removal of Cu (92.5 to 97.8%) and Pb (89.3 to 98.3%) was the highest at pH 6, while it was higher (84.7 to 93.9%) for Ni at pH 7. Fourier transform infrared spectroscopy results showed metal-unloaded biomass biofilms contained amino, hydroxyl, carboxyl, carbonyl, and phosphate groups. The peak positions of these groups were shifted responding to Cu, Ni, and Pb, suggesting biosorption of metals. Thus, these bacterial strains could be utilized to remove Cu, Ni, and Pb from aquatic environment.

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Microbial biofilm ecology, in silico study of quorum sensing receptor-ligand interactions and biofilm mediated bioremediation

Cited by 32 publications

References 146 publications

Rhizosphere Microbial Communities and Heavy Metals

Rhizosphere Microbial Communities and Heavy Metals

Sculpting the soil microbiota

Biofilm Formation, Production of Matrix Compounds and Biosorption of Copper, Nickel and Lead by Different Bacterial Strains

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