Natural abundance δ15N and δ13C of DNA extracted from soil

Egbert Schwartz, Steven Blazewicz, Richard Doucett, Bruce A Hungate, Stephen C. Hart, Paul Dijkstra

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

We report the first simultaneous measurements of δ15N and δ13C of DNA extracted from surface soils. The isotopic composition of DNA differed significantly among nine different soils. The δ13C and δ15N of DNA was correlated with δ13C and δ15N of soil, respectively, suggesting that the isotopic composition of DNA is strongly influenced by the isotopic composition of soil organic matter. However, in all samples DNA was enriched in 13C relative to soil, indicating microorganisms fractionated C during assimilation or preferentially used 13C enriched substrates. Enrichment of DNA in 15N relative to soil was not consistently observed, but there were significant differences between δ15N of DNA and δ15N of soil for three different sites, suggesting microorganisms are fractionating N or preferentially using N substrates at different rates across these contrasting ecosystems. There was a strong linear correlation between δ15N of DNA and δ15N of the microbial biomass, which indicated DNA was depleted in 15N relative to the microbial biomass by approximately 3.4‰. Our results show that accurate and precise isotopic measurements of C and N in DNA extracted from the soil are feasible, and that these analyses may provide powerful tools for elucidating C and N cycling processes through soil microorganisms.

Original languageEnglish (US)
Pages (from-to)3101-3107
Number of pages7
JournalSoil Biology and Biochemistry
Volume39
Issue number12
DOIs
StatePublished - Dec 2007

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Soil
Soils
DNA
soil
Microorganisms
isotopic composition
soil microorganism
soil microorganisms
Biomass
microbial biomass
Chemical analysis
substrate
biomass
Substrates
Biological materials
Ecosystems
Ecosystem
soil organic matter
soil surface
microorganism

Keywords

  • DNA
  • Natural abundance δC
  • Natural abundance δN
  • Soil microbial biomass

ASJC Scopus subject areas

  • Soil Science
  • Biochemistry
  • Ecology

Cite this

Natural abundance δ15N and δ13C of DNA extracted from soil. / Schwartz, Egbert; Blazewicz, Steven; Doucett, Richard; Hungate, Bruce A; Hart, Stephen C.; Dijkstra, Paul.

In: Soil Biology and Biochemistry, Vol. 39, No. 12, 12.2007, p. 3101-3107.

Research output: Contribution to journalArticle

Schwartz, Egbert ; Blazewicz, Steven ; Doucett, Richard ; Hungate, Bruce A ; Hart, Stephen C. ; Dijkstra, Paul. / Natural abundance δ15N and δ13C of DNA extracted from soil. In: Soil Biology and Biochemistry. 2007 ; Vol. 39, No. 12. pp. 3101-3107.
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