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Host Specificity of Pasteuria Penetrans Within the Genus Meloidogyne

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For more content, see Nematology.

Spores from each of four populations of Pasteuria penetrans were mixed with second-stage juveniles from 15 single egg mass populations of root-knot nematode and the number of spores attached to nematodes from each population was recorded 24 hr later. Spores of a population of P. penetrans from California, U.S.A. readily attached to most nematode populations but three populations of the pathogen from Australia were more specialized, spores attaching readily only to three or four nematode populations. At least one population of M. javanica, M. incognita and M. hapla became encumbered with spores of at least one population of P. penetrans, but spore attachment was not related to the species from which spores were obtained nor to the species of the recipient nematode. An experiment designed to relate spore attachment to infectivity showed that populations of P. penetrans which adhered poorly to particular nematode populations were sometimes unable to infect those populations. However, nematode populations to which few spores attached usually were hosts of the pathogen.

Affiliations: 1: Queensland Department of Primary Industries, Plant Pathology Branch, Meiers Road, Indooroopilly, 4068, Queensland, Australia


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