Pathogen effectors and plant immunity determine specialization of the blast fungus to rice subspecies

Liao Jingjing, Huang Huichuan, Meusnier Isabelle, Adreit Henri, Ducasse Aurélie, Bonnot François, Pan Lei, He Xiahong, Kroj Thomas, Fournier Elisabeth, Tharreau Didier, Gladieux Pierre, Morel Jean-Benoit. 2016. Pathogen effectors and plant immunity determine specialization of the blast fungus to rice subspecies. eLife, 5:e19377, 18 p.

https://doi.org/10.7554/eLife.19377

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Quartile : Outlier, Sujet : BIOLOGY

Résumé : Understanding how fungi specialize on their plant host is crucial for developing sustainable disease control. A traditional, centuries-old rice agro-system of the Yuanyang terraces was used as a model to show that virulence effectors of the rice blast fungus Magnaporthe oryzaeh play a key role in its specialization on locally grown indica or japonica local rice subspecies. Our results have indicated that major differences in several components of basal immunity and effector-triggered immunity of the japonica and indica rice varieties are associated with specialization of M. oryzae. These differences thus play a key role in determining M. oryzae host specificity and may limit the spread of the pathogen within the Yuanyang agro-system. Specifically, the AVR-Pia effector has been identified as a possible determinant of the specialization of M. oryzae to local japonica rice.

Mots-clés Agrovoc : Oryza sativa, Magnaporthe grisea, plante hôte, adaptation, effecteur moléculaire, épidémiologie, mode d'action, mécanisme de défense, variété, agroécosystème, résistance aux maladies, résistance génétique, génétique des populations, expression des gènes