Depth Wide Distribution and Metabolic Potential of Chemolithoautotrophic Microorganisms Reactivated from Deep Continental Granitic Crust Underneath the Deccan Traps at Koyna, India

Overview

Journal Front Microbiol

Specialty Microbiology

Date 2022 Dec 12

PMID 36504802

Authors

Sunanda Mandal

Himadri Bose

Kheerthana Ramesh

Rajendra Prasad Sahu

Anumeha Saha

Pinaki Sar

Sufia Khannam Kazy

Affiliations

Soon will be listed here.

Abstract

Characterization of inorganic carbon (C) utilizing microorganisms from deep crystalline rocks is of major scientific interest owing to their crucial role in global carbon and other elemental cycles. In this study we investigate the microbial populations from the deep [up to 2,908 meters below surface (mbs)] granitic rocks within the Koyna seismogenic zone, reactivated (enriched) under anaerobic, high temperature (50°C), chemolithoautotrophic conditions. Subsurface rock samples from six different depths (1,679-2,908 mbs) are incubated (180 days) with CO (+H) or HCO as the sole C source. Estimation of total protein, ATP, utilization of NO and SO and 16S rRNA gene qPCR suggests considerable microbial growth within the chemolithotrophic conditions. We note a better response of rock hosted community towards CO (+H) over HCO . 16S rRNA gene amplicon sequencing shows a depth-wide distribution of diverse chemolithotrophic (and a few fermentative) Bacteria and Archaea. , , unclassified Burkholderiaceae and Enterobacteriaceae are reactivated as dominant organisms from the enrichments of the deeper rocks (2335-2,908 mbs) with both CO and HCO . For the rock samples from shallower depths, organisms of varied taxa are enriched under CO (+H) and HCO . , , , and Thaumarchaeota are major CO (+H) utilizers, while , , , respond towards HCO . H oxidizing , , , CO fixing Cyanobacteria , , and methanogenic archaea are also enriched. Enriched chemolithoautotrophic members show good correlation with CO, CH and H concentrations of the native rock environments, while the organisms from upper horizons correlate more to NO , SO Fe and TIC levels of the rocks. Co-occurrence networks suggest close interaction between chemolithoautotrophic and chemoorganotrophic/fermentative organisms. Carbon fixing 3-HP and DC/HB cycles, hydrogen, sulfur oxidation, CH and acetate metabolisms are predicted in the enriched communities. Our study elucidates the presence of live, C and H utilizing Bacteria and Archaea in deep subsurface granitic rocks, which are enriched successfully. Significant impact of depth and geochemical controls on relative distribution of various chemolithotrophic species enriched and their C and H metabolism are highlighted. These endolithic microorganisms show great potential for answering the fundamental questions of deep life and their exploitation in CO capture and conversion to useful products.

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