Igor S Pessi

Igor S Pessi
University of Helsinki | HY · Department of Microbiology

PhD

About

29
Publications
8,599
Reads
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292
Citations
Introduction
Microbiologist, with a special interest in polar microbial ecology. Postdoctoral researcher at the University of Helsinki working with Arctic metagenomics
Additional affiliations
October 2012 - September 2017
University of Liège
Position
  • PhD Student
March 2010 - February 2012
Universidade Federal do Rio Grande do Sul
Position
  • Master's Student
March 2006 - February 2010
Universidade Federal do Rio Grande do Sul
Position
  • Student
Education
October 2012 - September 2017
University of Liège
Field of study
  • Biology of Organisms and Ecology
March 2010 - February 2012
Universidade Federal do Rio Grande do Sul
Field of study
  • Cellular and Molecular Biology
March 2005 - February 2010

Publications

Publications (29)
Article
Full-text available
The study of Antarctic cyanobacterial diversity has been mostly limited to morphological identification and traditional molecular techniques. High-throughput sequencing (HTS) allows a much better understanding of microbial distribution in the environment, but its application is hampered by several methodological and analytical challenges. In this w...
Article
Full-text available
The terrestrial Antarctic Realm has recently been divided into 16 Antarctic Conservation Biogeographic Regions (ACBRs) based on environmental properties and the distribution of biota. Despite their prominent role in the primary production and nutrient cycling in Antarctic lakes, cyanobacteria were only poorly represented in the biological dataset u...
Article
Full-text available
Cyanobacteria are important colonizers of recently deglaciated proglacial soil but an in-depth investigation of cyanobacterial succession following glacier retreat has not yet been carried out. Here, we report on the successional trajectories of cyanobacterial communities in biological soil crusts (BSCs) along a 100-year deglaciation gradient in th...
Article
Full-text available
Background: In contrast to earlier assumptions, there is now mounting evidence for the role of tundra soils as important sources of the greenhouse gas nitrous oxide (N2O). However, the microorganisms involved in the cycling of N2O in this system remain largely uncharacterized. Since tundra soils are variable sources and sinks of N2O, we aimed at i...
Article
Full-text available
Ammonia-oxidizing archaea (AOA) are key players in the nitrogen cycle of polar soils. Here, we analysed metagenomic data from tundra soils in Rásttigáisá, Norway, and recovered four metagenome-assembled genomes (MAGs) assigned to the genus “UBA10452”, an uncultured lineage of putative AOA in the order Nitrososphaerales (“terrestrial group I.1b”), p...
Article
Due to climate change, increased microbial activity in high-latitude soils may lead to higher greenhouse gas (GHG) emissions. However, microbial GHG production and consumption mechanisms in tundra soils are not thoroughly understood. To investigate how the diversity and functional potential of bacterial and archaeal communities vary across vegetati...
Preprint
Full-text available
Ammonia-oxidizing archaea (AOA) are key players in the nitrogen cycle of polar soils. Here, we analysed metagenomic data from tundra soils in Rásttigáisá, Norway, and recovered four metagenome-assembled genomes (MAGs) assigned to the genus "UBA10452", an uncultured lineage of putative AOA in the order Nitrososphaerales ("terrestrial group I.1b"), p...
Preprint
Full-text available
Background: In contrast to earlier assumptions, there is now mounting evidence for the role of tundra soils as important sources of the greenhouse gas nitrous oxide (N2O). However, the microorganisms involved in the cycling of N2O in this system remain largely uncharacterized. Since tundra soils are variable sources and sinks of N2O, we aimed at in...
Article
Full-text available
Poly-3-hydroxyalkanoic acids (PHAs) are bacterial storage polymers commonly used in bioplastic production. Halophilic bacteria are industrially interesting organisms as their salinity tolerance and psychrophilic nature lowers sterility requirements and subsequent production costs. We investigated the PHA synthesis in two bacterial strains, Halomona...
Preprint
Full-text available
Global warming changes the activity of soil microbial communities in high latitudes, which might result in higher greenhouse gas emissions. However, these microbial processes involved in GHG production and consumption are not thoroughly understood. We analyzed 116 soil metatranscriptomes from 73 tundra sites and investigated how bacterial and archa...
Article
Economic losses can result from biofouling establishment on man-made structures. Macrofouling causes damage to artificial substrates, which justifies the need for its control. However, the antifouling coatings employed nowadays are typically not safe for the environment. Microfouling can affect macrofouling colonization, and thus represents a poten...
Article
Molecular and morphological methods were applied to study cyanobacterial community composition in biological soil crusts (BSCs) from four areas (two nunataks and two ridges) in the Sør Rondane Mountains, Antarctica. The sampling sites serve as control areas for open top chambers (OTCs) that were put in place in 2010 at the time of sample collection...
Article
Full-text available
Moonmilk are cave carbonate deposits that host a rich microbiome, including antibiotic-producing Actinobacteria, making these speleothems appealing for bioprospecting. Here, we investigated the taxonomic profile of the actinobacterial community of three moonmilk deposits of the cave “Grotte des Collemboles” via high-throughput sequencing of 16S rRN...
Preprint
Full-text available
Moonmilk are cave carbonate deposits that host a rich microbiome including antibiotic-producing Actinobacteria making these speleothems appealing for bioprospecting. Here we investigated the taxonomic profile of the actinobacterial community of three moonmilk deposits of the cave “Grotte des Collemboles” via high-throughput sequencing of 16S rRNA a...
Thesis
Full-text available
Cyanobacteria are major components of Polar ecosystems. They comprise a considerable amount of the total biomass, are the main primary producers, and play important roles in the initial development of terrestrial and aquatic habitats. Although the cyanobacterial diversity in the Polar Regions has been well studied, research has been mostly limited...
Article
Full-text available
Travertine deposition is a landscape-forming process, usually building a series of calcareous barriers differentiating the river flow into a series of cascades and ponds. The process of carbonate precipitation is a complex relationship between biogenic and abiotic causative agents, involving adapted microbial assemblages but also requiring high lev...
Chapter
With fast development and wide applications of next generation sequencing (NGS) technologies, pyrosequencing of PCR-amplified fragments that target variable regions within the 16S rRNA gene has quickly become a powerful method for analyzing the microbial community profiles. In this chapter we describe an approach for sequencing 16S rRNA gene amplic...
Article
Full-text available
Phormidesmis priestleyi ULC007 is an Antarctic freshwater cyanobacterium. Its draft genome is 5,684,389 bp long. It contains a total of 5,604 protein-encoding genes, of which 22.2% have no clear homologues in known genomes. To date, this draft genome is the first one ever determined for an axenic cyanobacterium from Antarctica.
Article
Full-text available
Cyanobacterial diversity in soil crusts has been extensively studied in arid lands of temperate regions, particularly semi-arid steppes and warm deserts. Nevertheless, Arctic soil crusts have received far less attention than their temperate counterparts. Here we describe the cyanobacterial communities from various types of soil crusts from Svalbard...
Article
Full-text available
A novel actinobacterium, designated MM109T, was isolated from a moonmilk deposit collected from the cave 'Grotte des Collemboles' located in Comblain-au-Pont, Belgium. Based on a polyphasic taxonomic approach comprising chemo-taxonomic, phylogenetic, morphological, and physio-logical characterization, the isolate has been affiliated to the genus St...
Article
Full-text available
Several studies have shown that microbial communities in Antarctic environments are highly diverse. However, considering that the Antarctic Peninsula is among the regions with the fastest warming rates, and that regional climate change has been linked to an increase in the mean rate of glacier retreat, the microbial diversity in Antarctic soil is s...
Article
Full-text available
Microbial functional diversity in four soils sampled in the vicinity of Wanda Glacier, Antarctic Peninsula, was determined using Biolog EcoPlates at 5°C and 25°C. Comparisons of the patterns of substrate utilization and the diversity index showed differences in community composition, reflecting the heterogeneous distribution of microorganisms in th...
Article
Full-text available
Bipolaris sorokiniana is a phytopathogenic fungus that causes diseases in cereal crops. The high morphological, physiological, and genetic variability makes the control of this fungus a difficult task. The aim of this work was to study the virulence, morphological, and physiological variability of B. sorokiniana isolates. For this, 35 B. sorokinian...
Article
Full-text available
Bipolaris sorokiniana is a phytopathogenic fungus that causes diseases of cereal crops, such as leaf-spot disease, common root rot, and black point of grain. Because of its great morphological, physiological, and genetic variability, this fungus is difficult to control. The aim of this investigation was to study the variability of isolates of B. so...
Article
Full-text available
Bipolaris sorokiniana is a phytopathogen of great importance on the wheat culture regions, causing diseases such as spot blotch, common root rot and back point of bthe grain. This fungus is widely distributed over the country and is responsible for a great loss on the production and commercialization of the grain. It has a high physiological and mo...

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Projects

Projects (2)
Project
In-depth analysis of the taxonomic and functional diversity of microbial communities in Arctic soils using a multi-omics approach
Project
To study the diversity, evolutionary history and genetic make up of polar cyanobacteria. Focus is given to the application of high-throughput sequencing techniques to the study of cyanobacterial communities and strains from Arctic and Antarctic environments.