Increased rice susceptibility to rice blast is related to post-flowering nitrogen assimilation efficiency

Frontini Mathias, Morel Jean-Benoit, Gravot Antoine Gravot, Lafarge Tanguy, Ballini Elsa. 2022. Increased rice susceptibility to rice blast is related to post-flowering nitrogen assimilation efficiency. Journal of Fungi, 8 (11):1217, 13 p.

https://doi.org/10.3390/jof8111217

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Résumé : Reducing nitrogen leaching and nitrous oxide emissions with the goal of more sustainability in agriculture implies better identification and characterization of the different patterns in nitrogen use efficiency by crops. However, a change in the ability of varieties to use nitrogen resources could also change the access to nutrient resources for a foliar pathogen such as rice blast and lead to an increase in the susceptibility of these varieties. This study focuses on the pre- and post-floral biomass accumulation and nitrogen uptake and utilization of ten temperate japonica rice genotypes grown in controlled conditions, and the relationship of these traits with molecular markers and susceptibility to rice blast disease. After flowering, the ten varieties displayed diversity in nitrogen uptake and remobilization. Surprisingly, post-floral nitrogen uptake was correlated with higher susceptibility to rice blast, particularly in plants fertilized with nitrogen. This increase in susceptibility is associated with a particular metabolite profile in the upper leavers of these varieties.

Mots-clés Agrovoc : engrais azoté, génotype, variété, rendement des cultures, Oryza sativa, azote, floraison, résistance aux maladies, agriculture durable, métabolisme de l'azote, fertilisation, contrôle de maladies, pyriculariose du riz, cycle de l'azote

Mots-clés géographiques Agrovoc : France

Mots-clés libres : Magnaporthe oryzae, Nitrogen induced susceptibility, NUE, Nitrogen uptake, Rice

Agences de financement hors UE : Fonds de Soutien à l'Obtention Végétale, Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement, Région Occitanie Pyrénées-Méditerranée

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