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Nitrogen fertiliser rate affects the frequency of nitrate-dissimilating Pseudomonas spp. in the rhizosphere of Lolium perenne grown under elevated pCO2 (Swiss FACE) |
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| Authors: | N Fromin S Tarnawski J Hamelin EM Baggs |
| Institution: | a Laboratoire de Microbiologie, Université de Neuchâtel, CP2, 2007 Neuchâtel, Switzerland b Centre d'Ecologie Fonctionnelle et Evolutive, UMR CNRS 5175, 1919 route de Mende, 34293 Montpellier cedex 05, France c Laboratoire de Biotechnologie de l'Environnement, Institut National de la Recherche Agronomique (INRA), Avenue des Etangs, 11100 Narbonne, France d School of Biological Sciences, University of Aberdeen, Cruickshank Building, St Machar Drive, Aberdeen AB24 3UU, UK |
| 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. |
| Keywords: | N availability Nitrate dissimilation Pseudomonas Rhizosphere Perennial grass Rhizosphere Elevated atmospheric carbon dioxide |
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