Bacterial communities in pigmented biofilms formed on the sandstone bas-relief walls of the Bayon temple, Angkor Thom, Cambodia

Asako Kusumi, Xianshu Li, Yu Osuga, Arata Kawashima, Ji Dong Gu, Masao Nasu, Yoko Katayama*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

The Bayon temple in Angkor Thom, Cambodia has shown serious deterioration and is subject to the formation of various pigmented biofilms. Because biofilms are damaging the bas-reliefs, low reliefs engraved on the surface of sandstone, information about the microbial community within them is indispensable to control biofilm colonization. PCR-denaturing gradient gel electrophoresis (DGGE) analysis of biofilm samples from the pigmented sandstone surfaces showed that the bacterial community members in the biofilms differed clearly from those in the air and had low sequence similarity to database sequences. Non-destructive sampling of biofilm revealed novel bacterial groups of predominantly Rubrobacter in salmon pink biofilm, Cyanobacteria in chrome green biofilm, Cyanobacteria and Chloroflexi in signal violet biofilm, Chloroflexi in black gray biofilm, and Deinococcus-Thermus, Cyanobacteria, and Rubrobacter in blue green biofilm. Serial peeling-off of a thick biofilm by layers with adhesive sheets revealed a stratified structure: the blue-green biofilm, around which there was serious deterioration, was very rich in Cyanobacteria near the surface and Chloroflexi in deep layer below. Nitrate ion concentrations were high in the blue-green biofilm. The characteristic distribution of bacteria at different biofilm depths provides valuable information on not only the biofilm formation process but also the sandstone weathering process in the tropics.

Original languageEnglish
Pages (from-to)422-431
Number of pages10
JournalMicrobes and Environments
Volume28
Issue number4
DOIs
StatePublished - 2013
Externally publishedYes

Keywords

  • Bacterial community
  • Biodeterioration
  • Cultural heritage
  • Denaturing gradient gel electrophoresis
  • Non-destructive sampling

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