A strategy to identify sources of quantitative resistance in pathosystems involving disease escape and physiological resistance: the case study of rice sheath blight

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dc.creatorSrinivasachary, S.
dc.creatorBeligan, G.
dc.creatorWillocquet, L.
dc.creatorSavary, S.
dc.date2013-08
dc.date2024-12-19T12:55:24Z
dc.date2024-12-19T12:55:24Z
dc.date.accessioned2026-06-27T04:16:12Z
dc.descriptionAn epidemiology‐based strategy using rice sheath blight (ShB) as a biological model was developed that enables identification of sources of resistance. A set of 163 cultivated rice genotypes, including genotypes which had been reported to express partial resistance to ShB, and a few genotypes reported as very susceptible, were assessed using two complementary methods. First, microfield experiments allowed measurement of disease intensification at, and spread from, inoculated sources, along with morphological traits of each genotype. Secondly, detached tiller tests allowed measurement of the physiological resistance to the disease under conditions where morphology does not come into play. Multivariate analysis involving hierarchical cluster analysis, followed by multiple correspondence analysis, indicated that levels of physiological resistance, groups of plant morphology and disease levels in microfields were associated. Results from logistic regressions further indicated that a decreased number of lesions measured on detached tillers increased the odds of a rice genotype belonging to the group with low disease intensity in microfields. The combined results from microfield and detached tiller tests allowed identification of 23 genotypes with low level of disease intensity, which may be used as sources of resistance to ShB in breeding programmes. The results suggest that this strategy, which combines the crop stand and the individual tiller scales, may be applied to the identification of sources of resistance to a range of diseases with similar life cycle traits.
dc.identifierhttps://hdl.handle.net/10568/165726
dc.identifier.urihttp://hdl.handle.net/123456789/27198
dc.languageen
dc.publisherWiley
dc.sourceSrinivasachary, S., Beligan, G., Willocquet, L. and Savary, S. 2012. A strategy to identify sources of quantitative resistance in pathosystems involving disease escape and physiological resistance: the case study of rice sheath blight. Plant Pathology, 62(4), 888-899. Portico. https://doi.org/10.1111/j.1365-3059.2012.02695.x
dc.subjectbreeding programmes
dc.subjectdisease resistance
dc.subjectepidemiology
dc.subjectfungal diseases
dc.subjectfungi
dc.subjectgenotypes
dc.subjectlife cycle
dc.subjectmethodology
dc.subjectpathogens
dc.subjectplant diseases
dc.subjectplant morphology
dc.subjectplant pathogenic fungi
dc.subjectsheath blight
dc.subjectsusceptibility
dc.subjectthanatephorus cucumeris
dc.subjecttillers
dc.titleA strategy to identify sources of quantitative resistance in pathosystems involving disease escape and physiological resistance: the case study of rice sheath blight
dc.typeJournal Article

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Instituto Internacional de Investigación del Arroz (IRRI)