Biofilm-associated indole acetic acid producing bacteria and their impact in the proliferation of biofilm mats in solar salterns

Kerkar, Savita; Raiker, Laxmi; Tiwari, Anil Kumar; Mayilraj, Shanmugam; Dastager, Syed G.

doi:10.2478/s11756-012-0032-y

Cited by 13 publications

(4 citation statements)

References 32 publications

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“…are also tolerant of alkaline conditions and some species are known to produce acid [185][186][187]; whereas Salinibacter ruber does neither [188]. Non-pigmented halophilic genera with potential applications for bauxite residue bioremediation include Vibrio, Flavobacterium, Alcaligenes, Alteromonas, Halomonas, Bacillus, Salinicoccus, Pseudomonas, and Chromobacterium [183], many of which have a broad pH tolerance (pH 5-11), produce EPS (0.001-700 mg/L, with high concentrations of glucose and uronic acids) and produce NH 4 + [189][190][191][192][193][194][195]. The prevalence of haloalkalitolerance combined with capacity to produce acids and/or EPS and fix nutrients including C and N suggests that organisms from hypersaline environments may be valuable in the remediation of bauxite residues, with various species having potential for tolerating the extreme conditions, lowering the pH, forming soil aggregates, improving drainage, fixing nutrients and stabilising the surface.…”

Section: Hypersaline Lakes Salt Pans and Salternsmentioning

confidence: 99%

Microbially-driven strategies for bioremediation of bauxite residue

Santini

Kerr

Warren

2015

Journal of Hazardous Materials

119

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Globally, 3 Gt of bauxite residue is currently in storage, with an additional 120 Mt generated every year. Bauxite residue is an alkaline, saline, sodic, massive, and fine grained material with little organic carbon or plant nutrients. To date, remediation of bauxite residue has focused on the use of chemical and physical amendments to address high pH, high salinity, and poor drainage and aeration. No studies to date have evaluated the potential for microbial communities to contribute to remediation as part of a combined approach integrating chemical, physical, and biological amendments. This review considers natural alkaline, saline environments that present similar challenges for microbial survival and evaluates candidate microorganisms that are both adapted for survival in these environments and have the capacity to carry out beneficial metabolisms in bauxite residue. Fermentation, sulfur oxidation, and extracellular polymeric substance production emerge as promising pathways for bioremediation whether employed individually or in combination. A combination of bioaugmentation (addition of inocula from other alkaline, saline environments) and biostimulation (addition of nutrients to promote microbial growth and activity) of the native community in bauxite residue is recommended as the approach most likely to be successful in promoting bioremediation of bauxite residue.

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Section: Hypersaline Lakes Salt Pans and Salternsmentioning

confidence: 99%

Microbially-driven strategies for bioremediation of bauxite residue

Santini

Kerr

Warren

2015

Journal of Hazardous Materials

119

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“…Herein, we further proved that the effects of exogenous IAA and on algal growth and phenotypic changes is species-and even strain-dependent. IAA can exert stimulatory and inhibitory effects not only on algae, fungi, and yeast but also bacteria (Prusty, Grisafi & Fink, 2004;De-Bashan, Antoun & Bashan, 2008;Hu et al, 2010;Kerkar et al, 2012;Kulkarni et al, 2013;Sun et al, 2014;Liu, Chen & Chou, 2016;Fu et al, 2017). Bagwell et al (2014) reported the frequency of co-occurrence between IAA-producing bacteria and green algae in natural and engineered ecosystems and revealed that the chlorophyll content and dry weight of algal cells were IAA concentration-dependent.…”

Section: Notesmentioning

confidence: 99%

Effects of auxin derivatives on phenotypic plasticity and stress tolerance in five species of the green algaDesmodesmus(Chlorophyceae, Chlorophyta)

Lin

Chu

et al. 2020

PeerJ

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Green microalgae of the genus Desmodesmus are characterized by a high degree of phenotypic plasticity (i.e. colony morphology), allowing them to be truly cosmopolitan and withstand environmental fluctuations. This flexibility enables Desmodesmus to produce a phenotype–environment match across a range of environments broader compared to algae with more fixed phenotypes. Indoles and their derivatives are a well-known crucial class of heterocyclic compounds and are widespread in different species of plants, animals, and microorganisms. Indole-3-acetic acid (IAA) is the most common, naturally occurring plant hormone of the auxin class. IAA may behave as a signaling molecule in microorganisms, and the physiological cues of IAA may also trigger phenotypic plasticity responses in Desmodesmus. In this study, we demonstrated that the changes in colonial morphs (cells per coenobium) of five species of the green alga Desmodesmus were specific to IAA but not to the chemically more stable synthetic auxins, naphthalene-1-acetic acid and 2,4-dichlorophenoxyacetic acid. Moreover, inhibitors of auxin biosynthesis and polar auxin transport inhibited cell division. Notably, different algal species (even different intraspecific strains) exhibited phenotypic plasticity different to that correlated to IAA. Thus, the plasticity involving individual-level heterogeneity in morphological characteristics may be crucial for microalgae to adapt to changing or novel conditions, and IAA treatment potentially increases the tolerance of Desmodesmus algae to several stress conditions. In summary, our results provide circumstantial evidence for the hypothesized role of IAA as a diffusible signal in the communication between the microalga and microorganisms. This information is crucial for elucidation of the role of plant hormones in plankton ecology.

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“…Diversity studies on bacteria indicated the presence of members belonging to genera Aeromonas , Pseudomonas , Vibrio , Desulfobacter , Desulfovibrio , Desulfococcus and Chromohalobacter . These bacteria play an important role in the cycling of substances within the saltern ecosystem [35,36,42,43]. Culture dependent haloarchaeal diversity studies in the salterns of Goa indicated that Halococcus sp.…”

Section: Introductionmentioning

confidence: 99%

Community solar salt production in Goa, India

et al. 2012

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Traditional salt farming in Goa, India has been practised for the past 1,500 years by a few communities. Goa’s riverine estuaries, easy access to sea water and favourable climatic conditions makes salt production attractive during summer. Salt produced through this natural evaporation process also played an important role in the economy of Goa even during the Portuguese rule as salt was the chief export commodity. In the past there were 36 villages involved in salt production, which is now reduced to 9. Low income, lack of skilled labour, competition from industrially produced salt, losses incurred on the yearly damage of embankments are the major reasons responsible for the reduction in the number of salt pans.Salt pans (Mithagar or Mithache agor) form a part of the reclaimed waterlogged khazan lands, which are also utilised for aquaculture, pisciculture and agriculture. Salt pans in Goa experience three phases namely, the ceased phase during monsoon period of June to October, preparatory phase from December to January, and salt harvesting phase, from February to June. After the monsoons, the salt pans are prepared manually for salt production. During high tide, an influx of sea water occurs, which enters the reservoir pans through sluice gates. The sea water after 1–2 days on attaining a salinity of approximately 5ºBé, is released into the evaporator pans and kept till it attains a salinity of 23 - 25ºBé. The brine is then released to crystallizer pans, where the salt crystallises out 25 - 27ºBé and is then harvested.Salt pans form a unique ecosystem where succession of different organisms with varying environmental conditions occurs. Organisms ranging from bacteria, archaea to fungi, algae, etc., are known to colonise salt pans and may influence the quality of salt produced.The aim of this review is to describe salt farming in Goa’s history, importance of salt production as a community activity, traditional method of salt production and the biota associated with salt pans.

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Biofilm-associated indole acetic acid producing bacteria and their impact in the proliferation of biofilm mats in solar salterns

Cited by 13 publications

References 32 publications

Microbially-driven strategies for bioremediation of bauxite residue

Microbially-driven strategies for bioremediation of bauxite residue

Effects of auxin derivatives on phenotypic plasticity and stress tolerance in five species of the green algaDesmodesmus(Chlorophyceae, Chlorophyta)

Community solar salt production in Goa, India

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