Responses of soil microbial catabolic diversity to arbuscular mycorrhizal inoculation and soil disinfection |
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Authors: | A P Dabire V Hien M Kisa A Bilgo K S Sangare C Plenchette A Galiana Y Prin R Duponnois |
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Institution: | (1) INERA, Laboratoire SEP (Sol-Plante-Eau), 01 BP 476 Ouagadougou, Burkina Faso;(2) IRD, UMR 113 CIRAD/INRA/IRD/AGRO-M/UM2, Laboratoire des Symbioses Tropicales et Méditerranéennes (LSTM), TA10/J, Campus International de Baillarguet, 34398 Montpellier Cedex 5, France;(3) INRA, UMR BGA, 17 rue Sully, 21065 Dijon, Cedex, France;(4) CIRAD, UMR 113 CIRAD/INRA/IRD/AGRO-M/UM2, Laboratoire des Symbioses Tropicales et Méditerranéennes (LSTM), TA10/J, Campus International de Baillarguet, 34398 Montpellier Cedex 5, France;(5) Present address: IRD, Laboratoire Commun de Microbiologie IRD/ISRA/UCAD, Centre de Recherche de Bel Air, BP 1386 Dakar, Sénégal |
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Abstract: | Although it is usually admitted that arbuscular mycorrhizal (AM) fungi are key components in soil bio-functioning, little
is known on the response of microbial functional diversity to AM inoculation. The aims of the present study were to determine
the influence of Glomus intraradices inoculum densities on plant growth and soil microflora functional diversity in autoclaved soil or non-disinfected soil. Microbial
diversity of soil treatments was assessed by measuring the patterns of in situ catabolic potential of microbial communities.
The soil disinfection increased sorghum growth, but lowered catabolic evenness (4.8) compared to that recorded in the non-disinfected
soil (6.5). G. intraradices inoculation induced a higher plant growth in the autoclaved soil than in the non-disinfected soil. This AM effect was positively
related to inoculum density. Catabolic evenness and richness were positively correlated with the number of inoculated AM propagules
in the autoclaved soil, but negatively correlated in the non-disinfected soil. In addition, after soil disinfection and AM
inoculation, these microbial functionality indicators had higher values than in the autoclaved or in the non-disinfected soil
without AM inoculation. These results are discussed in relation to the ecological influence of AM inoculation, with selected
fungal strains and their associated microflora on native soil microbial activity. |
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Keywords: | Arbuscular mycorrhizal fungi Soil disturbance Microbial catabolic diversity |
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