![]() ![]() Of these ice-free areas, 90% are located along the continental coastline and occur on the Antarctic Peninsula and the Ross Sea Region (RSR). Notwithstanding genome incompleteness, these differences together with the decreased metabolic versatility are indicative of genome content scaling.Īntarctica is largely covered by glacial ice sheets, with ice-free areas making up ~0.32% of the entire continental land mass. ![]() Comparative analyses also revealed fewer protein-coding sequences and a significant decrease in genes associated with transcription and carbohydrate transport and metabolism in four of the seven Antarctic Arthrobacter isolates. ![]() Phenotypic characterisation revealed that Antarctic Arthrobacter isolates demonstrate significantly lower metabolic versatility and a narrower salinity tolerance range compared to temperate Arthrobacter species. However, these genes were also identified in genomes of seven temperate Arthrobacter spp., suggesting that these mechanisms are beneficial for growth and survival in a range of soil environments. These include genes primarily associated with sigma factors, signal transduction pathways, the carotenoid biosynthesis pathway and genes induced by cold-shock, oxidative and osmotic stresses. Genome analysis of the seven Antarctic Arthrobacter isolates revealed several features that are commonly observed in psychrophilic/psychrotolerant bacteria. at four locations in the Ross Sea Region. Quantitative PCR-based analysis revealed that up to 4% of the soil bacterial communities were comprised of Arthrobacter spp. ![]()
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