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Diversity of ACE1 genotypes of the rice blast fungus (Magnaporthe oryzae B.C. Couch) in the Philippines

Lopez Ana Liza C., Cumagun Christian Joseph R., Tharreau Didier. 2015. Diversity of ACE1 genotypes of the rice blast fungus (Magnaporthe oryzae B.C. Couch) in the Philippines. IAMURE International Journal of Ecology and Conservation, 16 (1) : pp. 80-92.

Journal article ; Article de recherche ; Article de revue à comité de lecture
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Abstract : Knowledge of the avirulence (Avr) genes present in plant pathogens facilitates the identification of the required resistance (R) gene to be incorporated in host plants to overcome pathogen infection. The plus/minus Polymerase Chain Reaction (PCR) assay was conducted to determine the presence of the virulent and avirulent ACE1 genotypes of the rice blast fungus in Philippine rice fields. Results indicated that the avirulent genotype Guy11 was present only in 13% of the test isolates, whereas the virulent genotypes, PH14 and CM28, appeared in 83% of the total number of test isolates. With contingency analysis on the type of agroecosystem and presence of ACE1 genotype, it was known that Guy11 is significantly associated with the upland agroecosystem. Whereas, PH14 was present in both the irrigated and rainfed lowland and CM28 was ubiquitously associated with any type of agroecosystems. No significant association, however, was noted between a specific ACE1 genotype and geographic location. The isolates having virulent ACE1 genotype can overcome the resistance Pi33 which is commonly introgressed into popular semi-dwarf indica rice varieties. (Résumé d'auteur)

Mots-clés Agrovoc : Magnaporthe grisea, Oryza sativa, Génotype, Résistance génétique, Variation génétique, Avirulence, Identification, Gène, PCR, Agroécosystème, Distribution géographique, Expérimentation, Riz pluvial

Mots-clés géographiques Agrovoc : Philippines

Classification Agris : H20 - Plant diseases
F30 - Plant genetics and breeding

Champ stratégique Cirad : Axe 4 (2014-2018) - Santé des animaux et des plantes

Auteurs et affiliations

  • Lopez Ana Liza C., University of the Philippines (PHL)
  • Cumagun Christian Joseph R., UPLB (PHL)
  • Tharreau Didier, CIRAD-BIOS-UMR BGPI (FRA) ORCID: 0000-0003-3961-6120

Source : Cirad-Agritrop (https://agritrop.cirad.fr/580846/)

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