Isolation and characterization of fast‐growing green snow bacteria from coastal East Antarctica. Issue 1 (29th December 2020)

• Record Type: Journal Article
• Authors: Smirnova, Margarita; Miamin, Uladzislau; Kohler, Achim; Valentovich, Leonid; Akhremchuk, Artur; Sidarenka, Anastasiya; Dolgikh, Andrey; Shapaval, Volha
• Is Part Of: MicrobiologyOpen. Volume 10:Issue 1(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-12-29
• Subjects: 16S rRNA gene amplicon sequencing -- 16S rRNA gene sequencing -- Antarctic bacteria -- Fourier transform infrared (FTIR) spectroscopy -- green snow -- principal component analysis; Microbiology -- Periodicals; 579
• DOI: 10.1002/mbo3.1152
• Languages: English
• ISSNs: 2045-8827

Abstract

Abstract: Snow microorganisms play a significant role in climate change and affecting the snow melting rate in the Arctic and Antarctic regions. While research on algae inhabiting green and red snow has been performed extensively, bacteria dwelling in this biotope have been studied to a much lesser extent. In this study, we performed 16S rRNA gene amplicon sequencing of two green snow samples collected from the coastal area of the eastern part of Antarctica and conducted genotypic and phenotypic profiling of 45 fast‐growing bacteria isolated from these samples. 16S rRNA gene amplicon sequencing of two green snow samples showed that bacteria inhabiting these samples are mostly represented by families Burkholderiaceae (46.31%), Flavobacteriaceae (22.98%), and Pseudomonadaceae (17.66%). Identification of 45 fast‐growing bacteria isolated from green snow was performed using 16S rRNA gene sequencing. We demonstrated that they belong to the phyla Actinobacteria and Proteobacteria, and are represented by the genera Arthrobacter, Cryobacterium, Leifsonia, Salinibacterium, Paeniglutamicibacter, Rhodococcu s, Polaromonas, Pseudomonas, and Psychrobacter . Nearly all bacterial isolates exhibited various growth temperatures from 4°C to 25°C, and some isolates were characterized by a high level of enzymatic activity. Phenotyping using Fourier transform infrared (FTIR) spectroscopy revealed a possible accumulation of intracellular polymer polyhydroxyalkanoates (PHA) or lipids in some isolates. The bacteria showed different lipids/PHA and protein profiles. It was shown that lipid/PHA and protein spectral regions are the most discriminative for differentiating the isolates. Abstract : Green snow bacteria play a significant role in climate change and affecting the snow melting rates in the Arctic and Antarctic regions. In this study, 45 fast‐growing bacteria were isolated from green snow in East Antarctica. Bacterial isolates, identified by 16S rRNA sequencing, showed a wide range of growth temperature from 4°C to 25°C and a high‐level of enzymatic activity. Phenotyping using Fourier‐transform infrared spectroscopy revealed a possible accumulation of intracellular polymers and lipids in some of the isolates.