Jakub Grzesiak

Jakub Grzesiak
Institute of Biochemistry and Biophysics Polish Academy of Sciences · Department of Antarctic Biology

PhD

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52
Publications
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318
Citations

Publications

Publications (52)
Article
Full-text available
Antarctic hairgrass, Deschampsia antarctica Desv. (Poaceae), is one of the two flowering plants that have an established presence in Maritime Antarctica. It has adapted to varying edaphic and climatic conditions. D. antarctica's associations with soil-dwelling bacteria have long been suspected to add to its remarkable resilience. In this study, thr...
Article
Strains P8930T and 478 were isolated from Antarctic glaciers located on James Ross Island and King George Island, respectively. They comprised Gram-stain-negative short rod-shaped cells forming pink pigmented colonies and exhibited identical 16S rRNA gene sequences and highly similar MALDI TOF mass spectra, and hence were assigned as representative...
Poster
Full-text available
Lichens are known to be a great example of pioneer species with the ability to grow and thrive even in the most extreme conditions. This is due in most part to their composition, which consists of an exceptionally functioning symbiosis between a heterotrophic fungus and a photobiont, i.e. a green algae or cyanobacteria. The recent discovery of anot...
Article
Full-text available
Colobanthus quitensis (Kunth) Bartl. and Deschampsia antarctica Desv. are the only Magnoliophyta to naturally colonize the Antarctic region. The reason for their sole presence in Antarctica is still debated as there is no definitive consensus on how only two unrelated flowering plants managed to establish breeding populations in this part of the wo...
Article
Full-text available
Lichens are presently regarded as stable biotopes, small ecosystems providing a safe haven for the development of a diverse and numerous microbiome. In this study, we conducted a functional diversity assessment of the microbial community residing on the surface and within the thalli of Leptogium puberulum, a eurytopic cyanolichen endemic to Antarct...
Poster
Full-text available
Lichens are a known example of an ideal symbiosis consisting of a heterotrophic fungus, as well as a photobiont, more specifically a green algae or cyanobacteria. However, another component integral to this symbiotic relationship has been recently suggested – a microbiome of heterotrophic prokaryotes. This discovery begs to reassess the current vie...
Article
Full-text available
Poa annua (annual bluegrass) is one of the most ubiquitous grass species in the world. In isolated regions of maritime Antarctica, it has become an invasive organism threatening native tundra communities. In this study, we have explored and compared the rhizosphere and root endosphere dwelling microbial community of P. annua specimens of maritime A...
Poster
Full-text available
Polyhydroxyacids (PHAs) are bacterial storage materials of enormous biotechnological potential. Prospecting for PHA producers is therefore of key importance. 200 bacterial isolates originating from different polar region habitats have been screened using gene-based and physiology-dependent methods (epifluorescent microscopy and agar plate), includi...
Article
Full-text available
Polyhydroxyalkanoates (PHAs), the intracellular polymers produced by various microorganisms as carbon and energy storage, are of great technological potential as biodegradable versions of common plastics. PHA-producing microbes are therefore in great demand and a plethora of different environments, especially extreme habitats, have been probed for...
Article
Full-text available
Despite recent great interest in glacier ecosystems in the continental Antarctic, little is known about their maritime counterparts. Our study presents descriptive data on cryoconite sediments and cryoconite holes on Ecology Glacier (King George Island) to accomplish three main objectives: (a) to identify main eukaryotic (algae, invertebrates) and...
Article
Adélie penguins (Pygoscelis adeliae) are themost numerous flightless bird group breeding in coastal areas ofMaritime and Continental Antarctica. Their activity leaves a mark on the land in the form of large guano deposits. This guano is an important nutrient source for terrestrial habitats of ice-free Antarctic areas,most notably by being the sourc...
Article
Full-text available
The Arctic and Antarctic have been of great interest to the international community for a number of years. The still unresolved problem regardingpolar regions is the still partially regulated legal issues concerning the management of these areas. Both the Arctic and Antarctica are areas of potentiallygreat scientific, economic, political and milita...
Article
Full-text available
Cold-active bacteria of the genus Polaromonas (class Betaproteobacteria) are important components of glacial microbiomes. In this study, extrachromosomal replicons of 26 psychrotolerant Polaromonas strains, isolated from Arctic and Antarctic glaciers, were identified, sequenced, and characterized. The plasmidome of these strains consists of 13 repl...
Article
Full-text available
The Antarctic and the Southern Ocean are a critically important part of the Earth system. The climatic, physical, and biological properties of this region are closely linked to other parts of the global environment. 200 years of direct human impact, recent climate amelioration and changes in the main sources and circulation of biogenic compounds as...
Article
Full-text available
Glaciers have recently been recognized as ecosystems comprised of several distinct habitats: a sunlit and oxygenated glacial surface, glacial ice, and a dark, mostly anoxic glacial bed. Surface meltwaters annually flood the subglacial sediments by means of drainage channels. Glacial surfaces host aquatic microhabitats called cryoconite holes, regar...
Article
Full-text available
Polaromonas is one of the most abundant genera found on glacier surfaces, yet its ecology remains poorly described. Investigations made to date point towards a uniform distribution of Polaromonas phylotypes across the globe. We compared 43 Polaromonas isolates obtained from surfaces of Arctic and Antarctic glaciers to address this issue. 16S rRNA g...
Article
Full-text available
The Svalbard archipelago (Spitsbergen Island) is the northernmost landmass in the European Arctic and has a variety of small- and medium-sized glaciers. The plasmidome of eleven psychrophilic strains of Variovorax spp. isolated from the ice surface of Hans and Werenskiold Glaciers of Spitsbergen Island, was defined. This analysis revealed the prese...
Data
##Assembly-Data-START## Assembly Method :: Clone Manager v. 9 Sequencing Technology :: Sanger dideoxy sequencing ##Assembly-Data-END##
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##Assembly-Data-START## Assembly Method :: Clone Manager v. 9 Sequencing Technology :: Sanger dideoxy sequencing ##Assembly-Data-END##
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##Assembly-Data-START## Assembly Method :: Clone Manager v. 9 Sequencing Technology :: Sanger dideoxy sequencing ##Assembly-Data-END##
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##Assembly-Data-START## Assembly Method :: Clone Manager v. 9 Sequencing Technology :: Sanger dideoxy sequencing ##Assembly-Data-END##
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##Assembly-Data-START## Assembly Method :: Clone Manager v. 9 Sequencing Technology :: Sanger dideoxy sequencing ##Assembly-Data-END##
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##Assembly-Data-START## Assembly Method :: Clone Manager v. 9 Sequencing Technology :: Sanger dideoxy sequencing ##Assembly-Data-END##
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##Assembly-Data-START## Assembly Method :: Clone Manager v. 9 Sequencing Technology :: Sanger dideoxy sequencing ##Assembly-Data-END##
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##Assembly-Data-START## Assembly Method :: Clone Manager v. 9 Sequencing Technology :: Sanger dideoxy sequencing ##Assembly-Data-END##
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##Assembly-Data-START## Assembly Method :: Clone Manager v. 9 Sequencing Technology :: Sanger dideoxy sequencing ##Assembly-Data-END##
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##Assembly-Data-START## Assembly Method :: Clone Manager v. 9 Sequencing Technology :: Sanger dideoxy sequencing ##Assembly-Data-END##
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##Assembly-Data-START## Assembly Method :: Clone Manager v. 9 Sequencing Technology :: Sanger dideoxy sequencing ##Assembly-Data-END##
Article
Full-text available
In recent years, glacial surfaces have received much attention as microbial habitats of diverse photoau-totrophic and heterotrophic cells. Supraglacial ecosystems are annually covered and uncovered by snow. The aim of this study is to investigate the microbial community response to changing environmental conditions in a transect following the reced...
Article
Full-text available
Surface ice and cryoconite holes of two types of polythermal Svalbard Glaciers (Hans Glacier—grounded tidewater glacier and Werenskiold Glacier—land-based valley glacier) were investigated in terms of chemical composition, microbial abundance and diversity. Gathered data served to describe supraglacial habitats and to compare microbe–environment in...
Article
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We determined sulphate-reducing activities in media inoculated with soils and with kettle lake sediments in order to investigate their potential in geomicrobiological processes in low-temperature, terrestrial maritime Antarctic habitats. Soil and sediment samples were collected in a glacier valley abandoned by Ecology Glacier during the last 30 yea...
Article
Full-text available
The diversity of polyhydroxyalkanoates-producing bacteria in freshwater reservoirs in the Ecology Glacier foreland, Antarctica, was examined by a cultivation-dependent method. Isolated strains were analyzed phylogenetically by 16S rRNA gene sequencing, and classified as members of Alpha-, Beta-, or Gammaproteobacteria classes. Polymerase chain reac...
Article
Pseudomonas sp. GLE121 (a psychrophilic Antarctic strain) carries three plasmids: pGLE121P1 (6899 bp), pGLE121P2 (8330 bp) and pGLE121P3 (39,583 bp). Plasmids pGLE121P1 and pGLE121P2 show significant sequence similarity to members of the IncP-9 and IncP-7 incompatibility groups, respectively, while the largest replicon, pGLE121P3, is highly related...
Article
Full-text available
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 ele...
Data
##Assembly-Data-START## Sequencing Technology :: Sanger dideoxy sequencing ##Assembly-Data-END##
Article
Full-text available
One of the dramatic effects of global warming is the retreat of glaciers. This phenomenon has intensifi ed in the last two decades. Postglacial areas are quickly colonised by various groups of organisms. Auto- and heterotrophic microorganisms play an especially vital role in these processes. They thrive in shallow glacial lagoons which often form i...
Article
Full-text available
Since 1978 the retreat of Ecology Glacier in the vicinity of Henryk Arctowski Station has opened new ice-free areas for colonization by terrestrial organisms initiated by pioneermicrobes. Samples were collected from the soil surface, at 0, 5 and 20 cm below surface close to glacier front, then stored at below -20°C. Total bacterial count (TC), esti...

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Projects (3)
Project
Our main goal is to determine whether the non-photosynthetic prokaryotic part of the lichen microbiome is species-specific, is it dependent on the trophic status of the surrounding polar environment and also are the changes within this microbial community connected to lichen thalli age.
Project
The main objective of this project is to examine the role of bacterial storage materials that are PHAs in adaptation of polar region bacteria to stress conditions but also to evaluate biotechnological potential of those microbes and the PHAs they produce.