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Diversity of the bacterial hyperparasite Pasteuria penetrans in relation to root-knot nematodes (Meloidogyne spp.) control on Acacia holosericea

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Pasteuria penetrans isolates sampled from different geographical areas were characterised both for the heterogeneity of the endospore surface using monoclonal antibodies and for the ability of spores to attach to different isolates of Meloidogyne spp. The efficacy of these different Pasteuria isolates as biological control agents was tested in a glasshouse experiment with M. incognita from Senegal on Acacia holosericea. The immunoprofiles divided the P. penetrans isolates broadly differently from the attachment tests. Isolate PP16 from Senegal was associated with better seedling development of M. incognita-inoculated A. holoceria than were other isolates. Substantial variation in root and shoot biomass was not related to the observed variation in spore attachment tests. The difficulties involved in obtaining consistent biological control with Pasteuria are discussed in relation to the high degree of variability of this bacterium.

Diversité chez l'hyperparasite bactérien Pasteuria penetrans en relation avec le contrôle du nématode Meloidogyne spp. sur Acacia holosericea - Des isolats de Pasteuria penetrans provenant de différentes régions géographiques ont été caractérisés en ce qui concerne, d'une part l'hétérogénéité de la surface des endospores - par utilisation d'anticorps monoclonaux -, d'autre part la capacité des spores à s'attacher à différentes souches de Meloidogyne spp. L'efficacité de ces différents isolats de P.penetrans en tant qu'agent de contrôle a été testée lors d'une expérience en serre utilisant un M. incognita d'origine sénégalaise et Acacia holosericea. Les isolats de P.penetrans ont montré des différences dans les profils immunologiques, différences non corrélées avec celles observées lors des tests d'attachement. En comparaison avec d'autres isolats, l'isolat PP16 provenant du Sénégal était associé à une meilleure croissance des plants de A. holosericea infestés par M. incognita. La variabilité importante touchant les biomasses aérienne et souterraine ne montrait aucune relation avec les différences observées lors des tests d'attachement. Les difficultés rencontrées pour obtenir un contrôle valable à l'aide de P.penetrans sont discutées en tenant compte du degré important de variabilité chez cette bactérie.

Affiliations: 1: IRD, Laboratoire de Biopédologie, B.P.1386, Dakar,Sénégal; 2: IRD, Laboratoire de Nématologie, CIRAD / IRD, B.P.5035, 34032 Montpellier,France; 3: IRD, Laboratoire de Nématologie, B.P.1386, Dakar,Sénégal; 4: CNRS, UMR 5558, Université Lyon 1, 69622 Villeurbanne Cedex, France; 5: IACR, Entomology and Nematology Department, Rothamsted, Harpenden, Hertfordshire, UK

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/content/journals/10.1163/156854100509295
2000-06-15
2016-12-11

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