Mate finding, sexual spore production, and the spread of fungal plant parasites

Hamelin Frédéric, Castella François, Doli Valentin, Marçais Benoît, Ravigné Virginie, Lewis Mark A.. 2016. Mate finding, sexual spore production, and the spread of fungal plant parasites. Bulletin of Mathematical Biology, 78 (4) : 695-712.

https://doi.org/10.1007/s11538-016-0157-1

Article de revue ; Article de recherche ; Article de revue à facteur d'impact

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Quartile : Q3, Sujet : BIOLOGY / Quartile : Q3, Sujet : MATHEMATICAL & COMPUTATIONAL BIOLOGY

Résumé : Sexual reproduction and dispersal are often coupled in organisms mixing sexual and asexual reproduction, such as fungi. The aim of this study is to evaluate the impact of mate limitation on the spreading speed of fungal plant parasites. Starting from a simple model with two coupled partial differential equations, we take advantage of the fact that we are interested in the dynamics over large spatial and temporal scales to reduce the model to a single equation. We obtain a simple expression for speed of spread, accounting for both sexual and asexual reproduction. Taking Black Sigatoka disease of banana plants as a case study, the model prediction is in close agreement with the actual spreading speed (100 km per year), whereas a similar model without mate limitation predicts a wave speed one order of magnitude greater. We discuss the implications of these results to control parasites in which sexual reproduction and dispersal are intrinsically coupled.

Mots-clés Agrovoc : pathologie végétale, mycologie, transmission des maladies, champignon pathogène, dynamique des populations, comportement sexuel, reproduction sexuée, reproduction asexuée, parthénogénèse, sporulation, contrôle de maladies, étude de cas, Musa, Mycosphaerella fijiensis, modèle mathématique