The role of extracellular polymeric substances in the silicification of calothrix: Evidence from microbial mat communities in hot springs at Yellowstone National Park, USA

Richard C. Hugo, Sherry L. Cady, Wendy Smythe

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

We provide nanoscale evidence of the role of sheath exopolymers in the silicification of the sheathed cyanobacteria Calothrix. Electron microscope observations of silicified Calothrix cells revealed that silica accretes directly onto EPS sheath fibrils to produce an open web of silica particles that could remain permeable to nutrients andwaste products.We also found that silicified Calothrix cells from different microhabitats contained morphologically distinct silica particles. Differences in silicification texture suggest that environmental variables may influence silicification at the nanoscale. We develop a framework based on aggregation kinetics to address silicification processes in Calothrix and other sheathed cyanobacteria.

Original languageEnglish (US)
Pages (from-to)667-675
Number of pages9
JournalGeomicrobiology Journal
Volume28
Issue number8
DOIs
StatePublished - Nov 2011
Externally publishedYes

Bibliographical note

Funding Information:
This article is based upon work supported by NASA under award No NNG04GJ84G to SLC. Specimens were collected from Yellowstone National Park under Permit # YELL-01994 to SLC. The authors thank the referees and appreciate the helpful discussion with Profs. Nancy Hinman and Carrine Blank at the University of Montana.

Keywords

  • Biosignatures
  • Calothrix
  • EPS
  • Silification
  • TEM

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