Du är här

Archaeal abundance across a pH gradient in an arable soil and its relationship with bacterial and fungal growth rates.

Publiceringsår: 2012
Språk: Engelska
Sidor: 5906-5911
Publikation/Tidskrift/Serie: Applied and environmental microbiology
Volym: 78
Nummer: 16
Dokumenttyp: Artikel
Förlag: American Society for Microbiology

Sammanfattning

Soil pH is one of the most influential factors for the composition of bacterial and fungal communities, but the influence of soil pH on the distribution and composition of soil archaeal communities has yet to be systematically addressed. The primary aim of this study was to determine how total archaeal abundance (qPCR based estimates of 16S rRNA gene copy numbers) is related to soil pH across a pH gradient (pH 4.0-8.3). Secondarily, we wanted to assess how archaeal abundance related to bacterial and fungal growth rates across the same pH gradient. We identified two distinct and opposite effects of pH on the archaeal abundance. In the lowest pH range (pH 4.0-4.7) the abundance of archaea did not seem to respond to pH. Above this pH range there was a sharp, almost 4-fold, decrease in archaeal abundance, reaching a minimum at pH 5.1-5.2. The low archaeal abundance of archaeal 16S rRNA gene copies at this pH then sharply increased almost 150-fold with pH, resulting in an increase in the ratio between archaeal and bacterial copy numbers from a minimum of 0.002 to more than 0.07 at pH 8. The non-uniform archaeal response to pH could reflect variation in the archaeal community composition along the gradient, with some archaea adapted to acidic conditions, and others to neutral to slightly alkaline conditions. This suggestion is reinforced by observations of contrasting outcomes of the (competitive) interactions between archaea, bacteria and fungi towards the lower and higher ends of the examined pH gradient.

Disputation

Nyckelord

  • Biology and Life Sciences

Övrigt

  • Swedish Research Council
Published
  • Microbial carbon-use efficiency
  • The role of archaea in soil carbon and nitrogen turnover
  • BECC
Yes
  • Microbial Ecology
  • ISSN: 1098-5336

Box 117, 221 00 LUND
Telefon 046-222 00 00 (växel)
Telefax 046-222 47 20
lu [at] lu [dot] se

Fakturaadress: Box 188, 221 00 LUND
Organisationsnummer: 202100-3211
Om webbplatsen

LERU logo U21 logo