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Resistance in ryegrasses, Lolium spp., to three European populations of the root-knot nematode, Meloidogyne naasi

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For more content, see Nematologica.

Symptoms of Meloidogyne naasi invasion, development and reproduction were compared on 17 cloned ryegrass (Lolium multiflorum and L. perenne) plants, previously classified as susceptible (5 clones) or resistant (12) to a Welsh population. Observations on galling and reproduction confirmed the classification of most clones but some intermediate host status phenotypes were distinguished. Smaller root size at and immediately after inoculation was related to the generally poorer host status of L. perenne clones compared with those of L. multiflorum. Root axes number or size was not related to resistance and susceptiblity in either ryegrass species. In ryegrasses, resistance was expressed by slower nematode development rates, fewer females matured and those that laid eggs were less fecund. Gall numbers at 36 days after inoculation reliably predicted host status. A poor host cultivar of Phleum pratense included some plants on which a few galls with fully fecund females developed. The selected ryegrass clones maintained their phenotype when tested with populations of M. naasi from Belgium and France. Nonetheless, it cannot be concluded from these experiments that there is no heterogeneity for virulence in these nematode populations.

Resistance du ray-grass, Lolium spp., a trois populations europeennes du nematode a galle Meloidogyne naasi - Les symptomes causes par la penetration, le developpement et la reproduction de Meloidogyne naasi ont ete compares chez 17 clones de ray-grass (Lolium multiflorum et L. perenne) dont 5 consideres auparavant comme sensibles et 12 comme resistants a une population provenant du Pays de Galles. Les observations relatives a la formation des galles et a la reproduction confirment la qualification de la plupart de ces clones mais quelques phenotypes a statut d'hote intermediaire ont ete detectes. Une longueur de racines plus faible au moment de et immediatement apres l'inoculation est en general correlee au statut d'hote mediocre des clones de L. perenne si on les compare a ceux de L. multiflorum. Le nombre et la taille des racines axiales ne sont correles ni a la resistance ni a la sensibilite chez aucune des especes de ray-grass. La resistance s'exprime chez le ray-grass par le taux plus faible du developpement du nematode, le moindre nombre de femelles matures et une fecondite moins elevee chez celles qui pondent des oeufs. Le nombre de galles releve 36 jours apres l'inoculation permet de predire le statut d'hote de facon fiable. Un cultivar de Phleum pratense a statut d'hote mediocre comportait cependant quelques plants presentant un petit nombre de galles contenant des femelles parfaitement fecondes. Les clones de ray-grass etudies ont conserve leur phenotype lors de tests envers des populations de M. naasi provenant de France et de Belgique. Ces experiences ne permettent cependant pas de conclure qu'il n'existe aucune heterogeneite dans la virulence de ces populations de nematode.


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