Variability in aggressiveness of rice blast (Magnaporthe oryzae) isolates originating from rice leaves and necks: a case of pathogen specialization?

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dc.creatorGhatak, Abhijeet
dc.creatorWillocquet, Laetitia
dc.creatorSavary, Serge
dc.creatorKumar, Jatinder
dc.date2013-06-11
dc.date2024-12-19T12:55:17Z
dc.date2024-12-19T12:55:17Z
dc.date.accessioned2026-06-27T04:16:12Z
dc.descriptionRice blast, caused by Magnaporthe oryzae, causes yield losses associated with injuries on leaves and necks, the latter being in general far more important than the former. Many questions remain on the relationships between leaf and neck blast, including questions related to the population biology of the pathogen. Our objective was to test the hypothesis of adaptation of M. oryzae isolates to the type of organ they infect. To that aim, the components of aggressiveness of isolates originating from leaves and necks were measured. Infection efficiency, latent period, sporulation intensity, and lesion size were measured on both leaves and necks. Univariate and multivariate analyses indicated that isolates originating from leaves were less aggressive than isolates originating from necks, when aggressiveness components were measured on leaves as well as on necks, indicating that there is no specialization within the pathogen population with respect to the type of organ infected. This result suggests that the more aggressive isolates involved in epidemics on leaves during the vegetative stage of the crop cycle have a higher probability to infect necks, and that a population shift may occur during disease transmission from leaves to necks. Implications for disease management are discussed.
dc.identifierhttps://hdl.handle.net/10568/165638
dc.identifier.urihttp://hdl.handle.net/123456789/27200
dc.languageen
dc.publisherPublic Library of Science
dc.rightsOpen Access
dc.sourceGhatak, Abhijeet; Willocquet, Laetitia; Savary, Serge and Kumar, Jatinder. 2013. Variability in aggressiveness of rice blast (Magnaporthe oryzae) isolates originating from rice leaves and necks: a case of pathogen specialization?. PLoS ONE, Volume 8 no. 6 p. e66180
dc.subjectblast
dc.subjectdisease control
dc.subjectdisease resistance
dc.subjectleaves
dc.subjectmagnaporthe oryzae
dc.subjectpathogens
dc.subjectplant diseases
dc.subjectplant pathogenic fungi
dc.subjectyield losses
dc.titleVariability in aggressiveness of rice blast (Magnaporthe oryzae) isolates originating from rice leaves and necks: a case of pathogen specialization?
dc.typeJournal Article

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Instituto Internacional de Investigación del Arroz (IRRI)