Utilization of differential line and vegetative compatibility group methods for the characterization of isolates of Magnaporthe oryzae from Africa

Rotich F., Mutiga S., Feng C., Harvey J., Silué Drissa, Tharreau Didier, Mitchell Thomas K., Wang Guo-Liang, Talbot Nicholas J., Correll J.. 2015. Utilization of differential line and vegetative compatibility group methods for the characterization of isolates of Magnaporthe oryzae from Africa. Phytopathology, 105 (11S), Résumé : S4.120-S4.121. 2015 APS Annual Meeting, Pasadena, États-Unis, 1 Août 2015/5 Août 2015.

Quartile : Q1, Sujet : PLANT SCIENCES

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Psychologie-éthologie-ergonomie

Résumé : Rice blast, caused by Magnaporthe oryzae, is a disease that can cause severe losses in rice yields. Recent studies showed that demand for rice is increasing faster than the increase in production in Africa, and there is a need to mitigate production challenges such as rice blast. Breeding for resistance to rice blast in Africa requires knowledge of M. oryzae diversity and the history of resistance in the pathosystem. A core collection isolates of M. oryzae (n=100) from nine African countries (Benin, Burkina Faso, Ghana, Kenya, Mali, Nigeria, Tanzania, Togo, and Uganda) were assessed for vegetative compatibility groups (VCG) and for disease reactions based on an International Rice Research Institute set of differential lines and African interspecific cultivars. Preliminary analysis showed that VCGs were unique for each country, but the virulence phenotypes of isolates were not associated with the country of origin. Avirulence was observed in a range 25%-75% of the subset (n=49) of the isolates that were pathotyped using the 31 differential lines. The Pi9 resistance gene was most effective against the core set of isolates, conferring resistance against 75% of the isolates, followed by unknown resistances in two African interspecific cultivars, which conferred resistance against 56% of the isolates. Findings of this study will facilitate resistance breeding efforts to enhance effective control of rice blast in Africa.

Mots-clés Agrovoc : riz, Oryza, Magnaporthe, résistance aux maladies

Mots-clés géographiques Agrovoc : Afrique

Classification Agris : H20 - Maladies des plantes
U30 - Méthodes de recherche
F30 - Génétique et amélioration des plantes

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

Auteurs et affiliations

• Rotich F., University of Arkansas (USA) - auteur correspondant
• Mutiga S., University of Arkansas (USA)
• Feng C., University of Arkansas (USA)
• Harvey J., ILRI (KEN)
• Silué Drissa, AfricaRice (BEN)
• Tharreau Didier, CIRAD-BIOS-UMR BGPI (FRA) ORCID: 0000-0003-3961-6120
• Mitchell Thomas K., The Ohio State University (USA)
• Wang Guo-Liang, The Ohio State University (USA)
• Talbot Nicholas J., University of Exeter (GBR)
• Correll J., University of Arkansas (USA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/592073/)

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