Taxonomic and functional characteristics of microbial communities and their correlation with physicochemical properties of four geothermal springs in Odisha, India.

摘要: This study describes microbial diversity in four tropical hot springs representing moderately thermophilic environments (temperature range: 40-58 °C; pH: 7.2-7.4) with discrete geochemistry. Metagenome sequence data showed a dominance of Bacteria over Archaea; the most abundant phyla were Chloroflexi and Proteobacteria, although other also present, such as Acetothermia, Nitrospirae, Acidobacteria, Firmicutes, Deinococcus-Thermus, Bacteroidetes, Thermotogae, Euryarchaeota, Verrucomicrobia, Ignavibacteriae, Cyanobacteria, Actinobacteria, Planctomycetes, Spirochaetes, Armatimonadetes, Crenarchaeota, Aquificae. The distribution major genera their statistical correlation analyses physicochemical parameters predicted that temperature, aqueous concentrations ions (such sodium, chloride, sulfate, bicarbonate), total hardness, dissolved solids conductivity main environmental variables influencing community composition diversity. Despite observed high taxonomic diversity, there only little variations overall functional profiles communities springs. Genes involved metabolism carbohydrates carbon fixation class genes present these presence all six known autotrophic pathways metagenomes. A prevalence membrane transport, signal transduction, stress response, bacterial chemotaxis flagellar assembly along xenobiotic degradation metabolism. analysis metagenomic sequences affiliated to candidate phylum Acetothermia from spring TB-3 provided new insight into physiology yet-unknown members this lineage bacteria.