Structural Iron (II) of Basaltic Glass as an Energy Source for Zetaproteobacteria in an Abyssal Plain Environment, Off the Mid Atlantic Ridge

Frontiers in Microbiology
Pauline A HenriBénédicte Ménez

Abstract

To explore the capability of basaltic glass to support the growth of chemosynthetic microorganisms, complementary in situ and in vitro colonization experiments were performed. Microbial colonizers containing synthetic tholeitic basaltic glasses, either enriched in reduced or oxidized iron, were deployed off-axis from the Mid Atlantic Ridge on surface sediments of the abyssal plain (35°N; 29°W). In situ microbial colonization was assessed by sequencing of the 16S rRNA gene and basaltic glass alteration was characterized using Scanning Electron Microscopy, micro-X-ray Absorption Near Edge Structure at the Fe-K-edge and Raman microspectroscopy. The colonized surface of the reduced basaltic glass was covered by a rind of alteration made of iron-oxides trapped in a palagonite-like structure with thicknesses up to 150 μm. The relative abundance of the associated microbial community was dominated (39% of all reads) by a single operational taxonomic unit (OTU) that shared 92% identity with the iron-oxidizer Mariprofundus ferrooxydans PV-1. Conversely, the oxidized basaltic glass showed the absence of iron-oxides enriched surface deposits and correspondingly there was a lack of known iron-oxidizing bacteria in the inventoried diversity....Continue Reading

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Citations

Feb 5, 2019·FEMS Microbiology Ecology·Sean M McAllisterClara S Chan
Jun 29, 2018·Frontiers in Microbiology·Laura A ZinkeJan P Amend
Jan 1, 2021·Frontiers in Microbiology·Stephanie A Napieralski, Eric E Roden
Nov 14, 2018·Nano Letters·Chuanzhe MengCary L Pint

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Datasets Mentioned

BETA
PRJNA260775
EF067909.1
AY167311.1

Methods Mentioned

BETA
chips
chip
PCR
amplicons sequencing
X-ray
Scanning
Fluorescence

Software Mentioned

Wire
MEGA
ASW FLUOVIEW
F10
Mothur

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