CHARACTERIZATION OF RESISTANCE BREAKING MELOIDOGYNE-INCOGNITA - LIKE POPULATIONS USING LECTINS, MONOCLONAL-ANTIBODIES AND SPORES OF PASTEURIA-PENETRANS

Six single eggmass lines of Meloidogyne, originating from populations collected in the Ivory Coast which showed a particular esterase phenot ype (coded pVI) and an ability to overcome the resistance conferred by the Mi gene, were compared with M. incognita, using different probes. Labeling with different lectins gave similar results for the pVI line s and M. incognita. Strains of Pasteuria penetrans differentially reco gnized some of the populations, supporting the view that the pVI popul ations are different from M. incognita but also showing some variabili ty among the resistance breaking group of populations. Two monoclonal antibodies, raised to M. incognita and specifically reacting to this s pecies, indicated that the pVI populations were related to M. incognit a but also demonstrated some differences.