Nitrogen fertiliser rate affects the frequency of nitrate-dissimilating Pseudomonas spp. in the rhizosphere of Lolium perenne grown under elevated pCO(2) (Swiss FACE)

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

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Abstract

The effect of elevated pCO(2) (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 rootassociated Pseudomonas were greater under elevated (60 Pa) than under ambient (36 Pa) pCO(2) in both high and low N-fertilised swards. For both pCO(2) 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 pCO(2), most likely due to increased competition for N between plant and nitrate-dissimilating bacteria. (c) 2005 Elsevier Ltd. All rights reserved.

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

Keywords

  • N availability
  • nitrate dissimilation
  • Pseudomonas
  • rhizosphere
  • perennial grass
  • elevated atmospheric carbon dioxide
  • air CO2 enrichment
  • atmospheric CO2
  • trifolium-repens
  • grass swards
  • soil
  • carbin
  • input
  • N2O
  • diversity
  • emissions

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