Tracing the origin and evolutionary history of Pyricularia oryzae infecting maize and barnyard grass

Pordel Adel, Ravel Sébastien, Charriat FLorian, Gladieux Pierre, Cros-Arteil Sandrine, Milazzo Joëlle, Adreit Henri, Javan-Nikkhah Mohammad, Mirzadi Gohari Amir, Moumeni Ali, Tharreau Didier. 2021. Tracing the origin and evolutionary history of Pyricularia oryzae infecting maize and barnyard grass. Phytopathology, 111 (1), n.spéc. : pp. 128-136.

Journal article ; Article de recherche ; Article de revue à facteur d'impact
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Abstract : Blast disease is a notorious fungal disease leading to dramatic yield losses on major food crops such as rice and wheat. The causal agent, Pyricularia oryzae, encompasses different lineages, each having a different host range. Host shifts are suspected to have occurred in this species from Setaria sp. to rice and from Lolium sp. to wheat. The emergence of blast disease on maize in Iran was observed for the first time in the North of the country in 2012. We later identified blast disease in two additional regions of Iran, Gilan in 2013, and Golestan in 2016. Epidemics on the weed barnyard grass (Echinochloa spp.) were also observed in the same maize fields. Here, we showed that P. oryzae is the causal agent of this disease on both hosts. Pathogenicity assays in the greenhouse revealed that strains from maize can infect barnyard grass and conversely. However, genotyping with SSR markers and comparative genomics showed that strains causing field epidemics on maize and on barnyard grass are different, although they belong to the same previously undescribed clade of P. oryzae. Phylogenetic analyses including these strains and a maize strain collected in Gabon in 1985, revealed two independent host-range expansion events from barnyard grass to maize. Comparative genomics between maize and barnyard grass strains revealed the presence/absence of five candidate genes associated with host specificity on maize, with the deletion of a small genomic region possibly responsible for adaptation to maize.

Mots-clés Agrovoc : Pyricularia oryzae, Maladie fongique, blasts (of plants) [EN], Zea mays, Echinochloa, host range [EN], Relation hôte pathogène, Setaria (graminée), Lolium, Phylogénie, Génotype, Agent pathogène, Oryza sativa, Triticum aestivum

Mots-clés géographiques Agrovoc : Iran République islamique

Mots-clés complémentaires : Maladie émergente

Mots-clés libres : Magnaporthe oryzae, Emergence, New disease, Blast, Maize, Host range

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

Champ stratégique Cirad : CTS 4 (2019-) - Santé des plantes, des animaux et des écosystèmes

Auteurs et affiliations

  • Pordel Adel, Baluchestan Agricultural and Natural Resources Research and Education Center (IRN) - auteur correspondant
  • Ravel Sébastien, CIRAD-BIOS-UMR BGPI (FRA)
  • Charriat FLorian, Université de Montpellier (FRA)
  • Gladieux Pierre, INRAE (FRA)
  • Cros-Arteil Sandrine, INRAE (FRA)
  • Milazzo Joëlle, CIRAD-BIOS-UMR BGPI (FRA)
  • Adreit Henri, CIRAD-BIOS-UMR BGPI (FRA)
  • Javan-Nikkhah Mohammad, Université de Téhéran (IRN)
  • Mirzadi Gohari Amir, Université de Téhéran (IRN)
  • Moumeni Ali, RRII [Rice research institute of Iran] (IRN)
  • Tharreau Didier, CIRAD-BIOS-UMR BGPI (FRA) ORCID: 0000-0003-3961-6120

Source : Cirad-Agritrop (

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