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

Liao J., Huang H., Meusnier I., Adreit H., Ducasse A., Bonnot F., Pan L., He X., Kroj T., Fournier E., Tharreau D., Gladieux P., Morel J.B.. 2016. eLife, 5 : e19377 (18 p.).

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. (Résumé d'auteur)

Mots-clés : expression des gènes; génétique des populations; résistance génétique; résistance aux maladies; agroécosystème; variété; mécanisme de défense; mode d'action; Épidémiologie; effecteur moléculaire; adaptation; plante hôte; magnaporthe grisea; oryza sativa; france; chine; yunnan; oryza sativa japonica; oryza sativa indica

Thématique : Maladies des plantes

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