Culturable bacteria associated with Antarctic lichens: affiliation and psychrotolerance

Selbmann, Laura; Zucconi, Laura; Ruisi, Serena; Grube, Martín; Cardinale, Massimiliano; Onofri, Silvano

doi:10.1007/s00300-009-0686-2

Cited by 88 publications

(54 citation statements)

References 55 publications

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“…Those samples did, however, yield bacteria from genera considered plantassociated and/or plant-dependent, such as Sporosarcina, Bacillus, Pedobacter, Herminiimonas, Sphingomonas, and Rhodococcus, psychrophilic members of which have been isolated from the lichen and moss rhizospheres in polar regions (Männisto and Häggblom 2006;Lang et al 2007;Selbmann et al 2010). Furthermore, Herminiimonas sp.…”

Section: Microbial Community Along Transectmentioning

confidence: 99%

Culturable bacteria community development in postglacial soils of Ecology Glacier, King George Island, Antarctica

et al. 2012

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Glacier forelands are excellent sites in which to study microbial succession because conditions change rapidly in the emerging soil. Development of the bacterial community was studied along two transects on lateral moraines of Ecology Glacier, King George Island, by culture-dependent and culture-independent approaches (denaturating gradient gel electrophoresis). Environmental conditions such as cryoturbation and soil composition affected both abundance and phylogenetic diversity of bacterial communities. Microbiocenosis structure along transect 1 (severe cryoturbation) differed markedly from that along transect 2 (minor cryoturbation). Soil physical and chemical factors changed along the chronosequence (time since exposure) and influenced the taxonomic diversity of cultivated bacteria, particularly along transect 2. Arthrobacter spp. played a pioneer role and were present in all soil samples, but were most abundant along transect 1. Cultivated bacteria isolated from transect 2 were taxonomically more diverse than those cultivated from transect 1; those from transect 1 tended to express a broader range of enzyme and assimilation activities. Our data suggest that cryoturbation is a major factor in controlling bacterial community development in postglacial soils, shed light on microbial succession in glacier forelands, and add a new parameter to models that describe succession phenomena.

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Section: Microbial Community Along Transectmentioning

confidence: 99%

Culturable bacteria community development in postglacial soils of Ecology Glacier, King George Island, Antarctica

et al. 2012

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“…Such horizontal transfer might be plausible, given the ubiquity of associated bacterial communities. Diverse and abundant bacteria have also been observed in some alpine and antarctic lichens Selbmann et al 2010).…”

Section: Secondary Compounds From Microbial Associates Of Lichensmentioning

confidence: 99%

Bioactive lichen metabolites: alpine habitats as an untapped source

2010

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International audienceLichens are fungal and algal/cyanobacterial symbioses resulting in the production of specific metabolites. Some of these are forming an available biomass for phytochemical investigations, including the assessment of biological activities of the isolated compounds. The alpine or polar region are characterised by highly stressful environmental conditions for many organisms, but lichens are among the dominating organisms in these habitats. In the performant mutual protective system, lichen fungi often accumulate high amounts of metabolites with specific physicochemical properties (UV absorbents, hydrophobicity) which help the lichens to survive. Unique secondary metabolites and polysaccharides have been isolated and tested from these organisms. Even though this has been tested until now only with a low number of compounds so far, interesting activities have been recorded. We review here some of the antimicrobial, anti-inflammatory, antiproliferative and antioxidant activities properties described. Solutions with axenic biotechnological cultivation of each symbiotic partner and particularly the mycobiont to obtain the lichen secondary metabolites are challenging to overcome the limitations for the supply of these rare compounds. Additionally, these lichens appear to harbour a diversity of culturable microorganisms from which active compounds have also been isolated recently

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“…Moving toward the interior of the continent and at higher altitudes, conditions become more severe, and the biodiversity progressively decreases; epilithic growth becomes rare and represented by lichens only until almost complete disappearance, while endolithic colonization becomes predominant . The endolithic niche provides lichens and associated microbes such as bacteria and fungi (Selbmann et al 2010(Selbmann et al , 2013a more buffered conditions compared to the rock surface, and colonizers find a further chance of survival; endolithic lifestyle (Golubic et al 1981) should be regarded as a border adaptation of life before extinction (Friedmann and Ocampo-Friedmann 1976;Nienow and Friedmann 1993). Both eukaryotic and prokaryotic endolithic communities have been reported (Friedmann et al 1988), but the most widely distributed in the harshest ice-free areas of continental Antarctica is the cryptoendolithic lichen-dominated community (Fig.…”

Section: Introductionmentioning

confidence: 98%

Rock black fungi: excellence in the extremes, from the Antarctic to space

et al. 2014

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This work focuses on rock-inhabiting fungi (RIF) of Antarctic rocky deserts, considered the closest to a possible Martian habitat, as the best example of adaptation to the extremes. The study of RIF ecophysiology, resistance and adaptation provides tools that shed light on the evolution of extremophily. These studies also help define the actual limits for life and provide insight for investigating its existence beyond our planet. The scientific results obtained from over 20 years of research on the biodiversity, phylogeny and evolution toward extremotolerance reviewed here demonstrate how these fascinating organisms can withstand conditions well beyond those in their natural environment. A final focus is given on results and perspectives arising from a recent proteomic approach, and from astrobiological experiments and their significance for future space exploration. These studies demonstrate that Antarctic RIF offer an excellent opportunity to investigate many basic, but also applicative areas of research on extremophily.

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Culturable bacteria associated with Antarctic lichens: affiliation and psychrotolerance

Cited by 88 publications

References 55 publications

Culturable bacteria community development in postglacial soils of Ecology Glacier, King George Island, Antarctica

Culturable bacteria community development in postglacial soils of Ecology Glacier, King George Island, Antarctica

Bioactive lichen metabolites: alpine habitats as an untapped source

Rock black fungi: excellence in the extremes, from the Antarctic to space

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