Quantitative resistance of rice to blast disease

Eighteen rice cultivars used for differentiating physiologic races of Pyricularia oryzae in the Philippines were repeatedly exposed in the blast nursery, and seven of them artificially inoculated with 40 single-spore isolates. The number of lesions that formed on individual cultivars was negatively correlated with the percentage of resistant reactions of each cultivar to 242 races of P. oryzae in the Philippines, as well as to the 69 races identified during the tests. Cultivars resistant to most races had very few lesions. Accumulation of many vertical or specific resistance genes in a cultivar against many specific races of P. oryzae appears to confer horizontal or general resistance to blast. Comparison of 40 single-spore isolates for pathogenicity indicated that the spore populations of the majority of the isolates were heterogeneous, consisting of many different pathogenic races, very much like that in a blast nursery.

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Bibliographic Details
Main Authors: Sang Won Ahn, Ou, SH
Format: Journal Article biblioteca
Language:English
Published: 1982
Subjects:oryza sativa, disease resistance, pyricularia oryzae, resistencia a la enfermedad,
Online Access:https://hdl.handle.net/10568/43996
https://www.apsnet.org/publications/phytopathology/backissues/Documents/1982Articles/Phyto72n03_279.PDF
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spelling dig-cgspace-10568-439962023-02-15T05:16:06Z Quantitative resistance of rice to blast disease Sang Won Ahn Ou, SH oryza sativa disease resistance pyricularia oryzae resistencia a la enfermedad Eighteen rice cultivars used for differentiating physiologic races of Pyricularia oryzae in the Philippines were repeatedly exposed in the blast nursery, and seven of them artificially inoculated with 40 single-spore isolates. The number of lesions that formed on individual cultivars was negatively correlated with the percentage of resistant reactions of each cultivar to 242 races of P. oryzae in the Philippines, as well as to the 69 races identified during the tests. Cultivars resistant to most races had very few lesions. Accumulation of many vertical or specific resistance genes in a cultivar against many specific races of P. oryzae appears to confer horizontal or general resistance to blast. Comparison of 40 single-spore isolates for pathogenicity indicated that the spore populations of the majority of the isolates were heterogeneous, consisting of many different pathogenic races, very much like that in a blast nursery. 1982 2014-10-02T08:33:04Z 2014-10-02T08:33:04Z Journal Article 0031-949X https://hdl.handle.net/10568/43996 https://www.apsnet.org/publications/phytopathology/backissues/Documents/1982Articles/Phyto72n03_279.PDF en Open Access Phytopathology
institution CGIAR
collection DSpace
country Francia
countrycode FR
component Bibliográfico
access En linea
databasecode dig-cgspace
tag biblioteca
region Europa del Oeste
libraryname Biblioteca del CGIAR
language English
topic oryza sativa
disease resistance
pyricularia oryzae
resistencia a la enfermedad
oryza sativa
disease resistance
pyricularia oryzae
resistencia a la enfermedad
spellingShingle oryza sativa
disease resistance
pyricularia oryzae
resistencia a la enfermedad
oryza sativa
disease resistance
pyricularia oryzae
resistencia a la enfermedad
Sang Won Ahn
Ou, SH
Quantitative resistance of rice to blast disease
description Eighteen rice cultivars used for differentiating physiologic races of Pyricularia oryzae in the Philippines were repeatedly exposed in the blast nursery, and seven of them artificially inoculated with 40 single-spore isolates. The number of lesions that formed on individual cultivars was negatively correlated with the percentage of resistant reactions of each cultivar to 242 races of P. oryzae in the Philippines, as well as to the 69 races identified during the tests. Cultivars resistant to most races had very few lesions. Accumulation of many vertical or specific resistance genes in a cultivar against many specific races of P. oryzae appears to confer horizontal or general resistance to blast. Comparison of 40 single-spore isolates for pathogenicity indicated that the spore populations of the majority of the isolates were heterogeneous, consisting of many different pathogenic races, very much like that in a blast nursery.
format Journal Article
topic_facet oryza sativa
disease resistance
pyricularia oryzae
resistencia a la enfermedad
author Sang Won Ahn
Ou, SH
author_facet Sang Won Ahn
Ou, SH
author_sort Sang Won Ahn
title Quantitative resistance of rice to blast disease
title_short Quantitative resistance of rice to blast disease
title_full Quantitative resistance of rice to blast disease
title_fullStr Quantitative resistance of rice to blast disease
title_full_unstemmed Quantitative resistance of rice to blast disease
title_sort quantitative resistance of rice to blast disease
publishDate 1982
url https://hdl.handle.net/10568/43996
https://www.apsnet.org/publications/phytopathology/backissues/Documents/1982Articles/Phyto72n03_279.PDF
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