Community-level physiological profiling analyses show potential to identify the copiotrophic bacteria present in soil environments

PLoS One. 2017 Feb 7;12(2):e0171638. doi: 10.1371/journal.pone.0171638. eCollection 2017.

Abstract

Community-level physiological profiling (CLPP) analyses from very diverse environments are frequently used with the aim of characterizing the metabolic versatility of whole environmental bacterial communities. While the limitations of the methodology for the characterization of whole communities are well known, we propose that CLPP combined with high-throughput sequencing and qPCR can be utilized to identify the copiotrophic, fast-growing fraction of the bacterial community of soil environments, where oligotrophic taxa are usually dominant. In the present work we have used this approach to analyze samples of litter and soil from a coniferous forest in the Czech Republic using BIOLOG GN2 plates. Monosaccharides and amino acids were utilized significantly faster than other C substrates, such as organic acids, in both litter and soil samples. Bacterial biodiversity in CLPP wells was significantly lower than in the original community, independently of the carbon source. Bacterial communities became highly enriched in taxa that typically showed low abundance in the original soil, belonging mostly to the Gammaproteobacteria and the genus Pseudomonas, indicating that the copiotrophic strains, favoured by the high nutrient content, are rare in forest litter and soil. In contrast, taxa abundant in the original samples were rarely found to grow at sufficient rates under the CLPP conditions. Our results show that CLPP is useful to detect copiotrophic bacteria from the soil environments and that bacterial growth is substrate specific.

MeSH terms

  • Bacteria / classification*
  • Bacteria / genetics
  • Biodiversity*
  • Czech Republic
  • Environment
  • Phylogeny
  • Principal Component Analysis
  • RNA, Ribosomal, 16S / genetics
  • Soil Microbiology*

Substances

  • RNA, Ribosomal, 16S

Grants and funding

This work was supported by the Czech Science Foundation (14-09040P), by the Ministry of Education, Youth and Sports of the Czech Republic (LD15086) and by the Research Concept of the Institute of Microbiology of the CAS (RVO61388971). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.