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Genus-wide acid tolerance accounts for the biogeographical distribution of soil Burkholderia populations

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Publication date 2014
Author Stopnisek Nejc, Bodenhausen Natacha, Fierer Noah, Frey Beat, Eberl Leo, Weisskopf Laure,
Project Dominance of Burkholderia sp. in low pH Environments: from Biogeography to Tolerance Mechanisms
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Original article (peer-reviewed)

Journal Environmental Microbiology
Volume (Issue) 16(6)
Page(s) 1503 - 1512
Title of proceedings Environmental Microbiology
DOI 10.1111/1462-2920.12211

Abstract

Bacteria belonging to the genus Burkholderia are highly versatile with respect to their ecological niches and lifestyles, ranging from nodulating tropical plants to causing meliodiosis and fatal infections in cystic fibrosis patients. Despite the clinical importance and agronomical relevance of Burkholderia species, information about the factors influencing their occurrence, abundance and diversity in the environment is scarce. Recent findings have demonstrated that pH is the main predictor of soil bacterial diversity and community structure, with the highest diversity observed in neutral pH soils. As many Burkholderia species have been isolated from low pH environments, we hypothesized that acid tolerance may be a general feature of this genus and pH a good predictor of their occurrence in soils. Using a combination of environmental surveys at trans-continental and local scales as well as in vitro assays, we show that, unlike most bacteria, Burkholderia species have a competitive advantage in acidic soils, but are out-competed in alkaline soils. Physiological assays and diversity analysis based on 16S rRNA clone libraries demonstrate that pH tolerance is a general phenotypic trait of the genus Burkholderia. Our results provide a basis for building a predictive understanding of the biogeographical patterns exhibited by Burkholderia sp.
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