Nitrogen fertiliser rate affects the frequency of nitrate-dissimilating Pseudomonas spp. in the rhizosphere of Lolium perenne grown under elevated pCO2 (Swiss FACE)

N. Fromin*, S. Tarnawski, L. Roussel-Delif, J. Hamelin, E. M. Baggs, M. Aragno

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The effect of elevated pCO2 (60 Pa) on the frequency of nitrate-dissimilating Pseudomonas (NDP) was investigated in the rhizosphere of fertilised Lolium perenne swards in the Swiss Free Air Carbon dioxide Enrichment (FACE) experiment. Numbers of cultivable root-associated Pseudomonas were greater under elevated (60 Pa) than under ambient (36 Pa) pCO2 in both high and low N-fertilised swards. For both pCO2 conditions, the NDP frequency decreased with closer root proximity to L. perenne roots in low fertilised swards. Anyway, in high N swards the NDP frequency was similar in root and soil fractions. Thus, N availability may be a major factor influencing NDP populations under elevated pCO2, most likely due to increased competition for N between plant and nitrate-dissimilating bacteria.

Original languageEnglish
Pages (from-to)1962-1965
Number of pages4
JournalSoil Biology and Biochemistry
Volume37
Issue number10
DOIs
Publication statusPublished - 1 Oct 2005

Keywords

  • Elevated atmospheric carbon dioxide.
  • N availability
  • Nitrate dissimilation
  • Perennial grass
  • Pseudomonas
  • Rhizosphere

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