Psychrotrophic microorganism communities in soils of Haswell Island, Antarctica, and their biosynthetic potential

Gesheva, Victoria; Negoiţă, Teodor Gh

doi:10.1007/s00300-011-1052-8

Cited by 24 publications

(10 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In many cases the synthesis of biosurfactants was found to be associated with the production of extracellular enzymes such as lipases, proteases, amylases, and in some organisms also with the ability to grow and degrade hydrocarbon contaminants including polycyclic aromatics [17,18]. Since polar environments are typically pristine, we speculate that the ecological role of biosurfactants is to support the ability of microbial communities to metabolize plant-derived material (e.g., lignin, cellulose, hemicellulose, tannins, phenols), which are naturally enriched in organic hydrocarbon and aromatic compounds.…”

Section: Box 1 Definition Of Psychrophile [ 2 9 1 _ T D $ D I F F ] mentioning

confidence: 99%

“…Finally, the possibility to combine the production of cold-active enzymes and biosurfactants may be highly attractive for industrial bioprocessing. Many psychrophilic isolates [17,18] have shown concurrent capabilities, but more effort is now needed to characterize the synergistic interactions of the two processes also as a function of temperature and growth conditions.…”

Section: The Downside Of Cold Washingmentioning

confidence: 99%

See 1 more Smart Citation

Going Green and Cold: Biosurfactants from Low-Temperature Environments to Biotechnology Applications

Perfumo

Banat

Marchant

2018

Trends in Biotechnology

135

View full text Add to dashboard Cite

Approximately 80% of the Earth's biosphere is cold, at an average temperature of 5°C, and is populated by a diversity of microorganisms that are a precious source of molecules with high biotechnological potential. Biosurfactants from cold-adapted organisms can interact with multiple physical phases - water, ice, hydrophobic compounds, and gases - at low and freezing temperatures and be used in sustainable (green) and low-energy-impact (cold) products and processes. We review the biodiversity of microbial biosurfactants produced in cold habitats and provide a perspective on the most promising future applications in environmental and industrial technologies. Finally, we encourage exploring the cryosphere for novel types of biosurfactants via both culture screening and functional metagenomics.

show abstract

Section: Box 1 Definition Of Psychrophile [ 2 9 1 _ T D $ D I F F ] mentioning

confidence: 99%

Section: The Downside Of Cold Washingmentioning

confidence: 99%

Going Green and Cold: Biosurfactants from Low-Temperature Environments to Biotechnology Applications

Perfumo

Banat

Marchant

2018

Trends in Biotechnology

135

View full text Add to dashboard Cite

show abstract

“…The biomass produced via the cultivation of microbes from extreme environments has led to the discovery of extracellular substances with antibacterial and/or antifungal properties (Gesheva, 2010; Gesheva and Negoita, 2011; Tomova et al, 2015). Additionally, the production of surfactants (glycolipids), the ability to grow on paraffin and naphthalene (Gesheva and Negoita, 2011) and their resistance to heavy metals (Tomova et al, 2015), highlights the potential for cold-adapted microbes to emulsify contaminants, such as hydrocarbons. Continued isolation of rare polar species could provide access to further strains for biotechnological applications, such as bioremediation and discovery of novel bioactive compounds, such as antibiotics (Tosi et al, 2010; Tytgat et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Microbial Diversity of Browning Peninsula, Eastern Antarctica Revealed Using Molecular and Cultivation Methods

Pudasaini

Wilson

et al. 2017

Front. Microbiol.

View full text Add to dashboard Cite

Browning Peninsula is an ice-free polar desert situated in the Windmill Islands, Eastern Antarctica. The entire site is described as a barren landscape, comprised of frost boils with soils dominated by microbial life. In this study, we explored the microbial diversity and edaphic drivers of community structure across this site using traditional cultivation methods, a novel approach the soil substrate membrane system (SSMS), and culture-independent 454-tag pyrosequencing. The measured soil environmental and microphysical factors of chlorine, phosphate, aspect and elevation were found to be significant drivers of the bacterial community, while none of the soil parameters analyzed were significantly correlated to the fungal community. Overall, Browning Peninsula soil harbored a distinctive microbial community in comparison to other Antarctic soils comprised of a unique bacterial diversity and extremely limited fungal diversity. Tag pyrosequencing data revealed the bacterial community to be dominated by Actinobacteria (36%), followed by Chloroflexi (18%), Cyanobacteria (14%), and Proteobacteria (10%). For fungi, Ascomycota (97%) dominated the soil microbiome, followed by Basidiomycota. As expected the diversity recovered from culture-based techniques was lower than that detected using tag sequencing. However, in the SSMS enrichments, that mimic the natural conditions for cultivating oligophilic “k-selected” bacteria, a larger proportion of rare bacterial taxa (15%), such as Blastococcus, Devosia, Herbaspirillum, Propionibacterium and Methylocella and fungal (11%) taxa, such as Nigrospora, Exophiala, Hortaea, and Penidiella were recovered at the genus level. At phylum level, a comparison of OTU's showed that the SSMS shared 21% of Acidobacteria, 11% of Actinobacteria and 10% of Proteobacteria OTU's with soil. For fungi, the shared OTUs was 4% (Basidiomycota) and <0.5% (Ascomycota). This was the first known attempt to culture microfungi using the SSMS which resulted in an increase in diversity from 14 to 57 microfungi OTUs compared to standard cultivation. Furthermore, the SSMS offers the opportunity to retrieve a greater diversity of bacterial and fungal taxa for future exploitation.

show abstract

“…Environmental conditions are generally unfavorable in terrestrial Antarctic environments, with low thermal capacity of the substratum, frequent freeze–thaw and wet-dry cycles, low and transient precipitation, reduced humidity, rapid drainage and limited organic nutrients. Despite the extreme conditions, microorganisms including bacteria, archaea, micro fungi and microalgae, are the dominant life form in the Antarctic ecosystems representing relatively simplified system sensitive to perturbations (Niederberger et al 2008 ; Gesheva 2009 ; Gesheva and Negoita 2012 ). Psychrophilic and psychrotolerant microorganisms have developed various structural and functional adaptations allowing them to survive in harsh environments.…”

Section: Introductionmentioning

confidence: 99%

Psychrophilic pseudomonas in antarctic freshwater lake at stornes peninsula, larsemann hills over east Antarctica

et al. 2015

View full text Add to dashboard Cite

The Larsemann Hills is an ice-free area of approximately 50 km2, located halfway between the Vestfold Hills and the Amery Ice Shelf on the south-eastern coast of Prydz Bay, Princess Elizabeth Land, East Antarctica (69º30′S, 76º19′58″E). The ice-free area consists of two major peninsulas (Stornes and Broknes), four minor peninsulas, and approximately 130 islands. The Larsemann Hills area contains more than 150 lakes at different Islands and Peninsulas. Nine lake water samples were collected in a gamma sterilized bottles and were kept in an ice pack to prevent any changes in the microbial flora of the samples during the transportation. The water samples were transported to the lab in vertical position maintaining the temperature 1–4 °C with ice pack enveloped conditions. Samples were studied for Psychrophilic bacterial count, Pseudomonas spp., Staphylococcus aureus, Salmonella and Total MPN Coliform per 100 ml. Psychrophillic counts were found in the range of 12 cfu to 1.6 × 102 cfu in all the samples. MPN Coliform per 100 ml was found to be absent in all the samples. No growth and characteristics colonies observed when tested for Salmonella and S.aureus.Pseudomonas sp. was found in ST-2 lake water sample as characteristics colonies (Optimum Growth) were observed on selective media at 22 and 25 °C. Further several biochemical tests were also performed to confirm the presence of this Potential Psychrophilic Pseudomonas sp. for its further application in Science and Technology.Electronic supplementary materialThe online version of this article (doi:10.1186/s40064-015-1354-3) contains supplementary material, which is available to authorized users.

show abstract

Psychrotrophic microorganism communities in soils of Haswell Island, Antarctica, and their biosynthetic potential

Cited by 24 publications

References 39 publications

Going Green and Cold: Biosurfactants from Low-Temperature Environments to Biotechnology Applications

Going Green and Cold: Biosurfactants from Low-Temperature Environments to Biotechnology Applications

Microbial Diversity of Browning Peninsula, Eastern Antarctica Revealed Using Molecular and Cultivation Methods

Psychrophilic pseudomonas in antarctic freshwater lake at stornes peninsula, larsemann hills over east Antarctica

Contact Info

Product

Resources

About