Characterization of resistance breaking Meloidogyne-ingognita-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 phenotype (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 lines and M. incognita. Strains of Pasteuria penetrans differentially recognized some of the populations, supporting the view that the pVI populations are different from M. incognita but also showing some variability among the resistance breaking group of populations. Two monoclonal antibodies, raised to M. incognita and specifically reacting to this species, indicated that the pVI populations were related to M. incognita but also demonstrated some differences.