Abstract:Avirulent mutants of Xanthomonas oryzae occur during the course of successive culture on artificial media, and the population of these mutants gradually increases. In this experiment, mutual interference in multiplication between avirulent mutant (Av) and virulent wild type (V) in liquid media or inoculated rice leaves was studied. For the purpose of these studies, streptomycin resistant mutant from Av (Av-R), and that from V (V-R) were used frequently.Between Av and Av-R or between V and V-R, no difference co… Show more
Lesion development, bacterial multiplication and spread were measured in leaves of cultivars of rice containing different Xa (resistance) genes, following inoculation with different races of the bacterial leaf blight pathogen. Xanthomonas campestris pv. oryzae. Both compatible and incompatible races possessed the ability to colonize rice plants. The difference between compatible and incompatible host pathogen combinations appeared to be mainly in symptom production since multiplication rates and spread were very similar until after the onset of symptoms. No form of HR (hypersensitive response) was observed. The ability of incompatible races to modify host reaction in dual‐inoculation was dependent on the genotype of the host plant. The heterologous non‐pathogen of rice X. campestris pv. campestris produced few symptoms, failed either to multiply or spread within rice leaves and was unable to induce any marked cross‐protection against homologous pv. oryzae strains in dual‐inoculation experiments.
Lesion development, bacterial multiplication and spread were measured in leaves of cultivars of rice containing different Xa (resistance) genes, following inoculation with different races of the bacterial leaf blight pathogen. Xanthomonas campestris pv. oryzae. Both compatible and incompatible races possessed the ability to colonize rice plants. The difference between compatible and incompatible host pathogen combinations appeared to be mainly in symptom production since multiplication rates and spread were very similar until after the onset of symptoms. No form of HR (hypersensitive response) was observed. The ability of incompatible races to modify host reaction in dual‐inoculation was dependent on the genotype of the host plant. The heterologous non‐pathogen of rice X. campestris pv. campestris produced few symptoms, failed either to multiply or spread within rice leaves and was unable to induce any marked cross‐protection against homologous pv. oryzae strains in dual‐inoculation experiments.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.