Long-distance wind-dispersal of spores in a fungal plant pathogen: Estimation of anisotropic dispersal kernels from an extensive field experiment
Given its biological significance, determining the dispersal kernel (i.e., the distribution of dispersal distances) of sporeproducing pathogens is essential. Here, we report two field experiments designed to measure disease gradients caused by sexually- and asexually-produced spores of the wind-dispersed banana plant fungus Mycosphaerella fijiensis. Gradients were measured during a single generation and over 272 traps installed up to 1000 m along eight directions radiating from a traceable source of inoculum composed of fungicide-resistant strains. We adjusted several kernels differing in the shape of their tail and tested for two types of anisotropy. Contrasting dispersal kernels were observed between the two types of spores. For sexual spores (ascospores), we characterized both a steep gradient in the first few metres in all directions and rare long-distance dispersal (LDD) events up to 1000 m from the source in two directions. A heavy-tailed kernel best fitted the disease gradient. Although ascospores distributed evenly in all directions, average dispersal distance was greater in two different directions without obvious correlation with wind patterns. For asexual spores (conidia), few dispersal events occurred outside of the source plot. A gradient up to 12.5 m from the source was observed in one direction only. Accordingly, a thin-tailed kernel best fitted the disease gradient, and anisotropy in both density and distance was correlated with averaged daily wind gust. We discuss the validity of our results as well as their implications in terms of disease diffusion and management strategy.
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Subjects: | H20 - Maladies des plantes, Musa, Mycosphaerella fijiensis, transmission des maladies, agent pathogène, spore fongique, distribution spatiale, http://aims.fao.org/aos/agrovoc/c_4993, http://aims.fao.org/aos/agrovoc/c_27259, http://aims.fao.org/aos/agrovoc/c_2329, http://aims.fao.org/aos/agrovoc/c_5630, http://aims.fao.org/aos/agrovoc/c_35118, http://aims.fao.org/aos/agrovoc/c_36230, http://aims.fao.org/aos/agrovoc/c_1229, |
Online Access: | http://agritrop.cirad.fr/573903/ http://agritrop.cirad.fr/573903/1/document_573903.pdf |
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dig-cirad-fr-5739032024-01-28T22:11:51Z http://agritrop.cirad.fr/573903/ http://agritrop.cirad.fr/573903/ Long-distance wind-dispersal of spores in a fungal plant pathogen: Estimation of anisotropic dispersal kernels from an extensive field experiment. Rieux Adrien, Soubeyrand Samuel, Bonnot François, Klein Etienne, Ngando Essoh Otto Josué, Mehl Andréas, Ravigné Virginie, Carlier Jean, De Lapeyre de Bellaire Luc. 2014. PloS One, 9 (8):e103225, 13 p.https://doi.org/10.1371/journal.pone.0103225 <https://doi.org/10.1371/journal.pone.0103225> Long-distance wind-dispersal of spores in a fungal plant pathogen: Estimation of anisotropic dispersal kernels from an extensive field experiment Rieux, Adrien Soubeyrand, Samuel Bonnot, François Klein, Etienne Ngando Essoh Otto, Josué Mehl, Andréas Ravigné, Virginie Carlier, Jean De Lapeyre de Bellaire, Luc eng 2014 PloS One H20 - Maladies des plantes Musa Mycosphaerella fijiensis transmission des maladies agent pathogène spore fongique distribution spatiale http://aims.fao.org/aos/agrovoc/c_4993 http://aims.fao.org/aos/agrovoc/c_27259 http://aims.fao.org/aos/agrovoc/c_2329 http://aims.fao.org/aos/agrovoc/c_5630 http://aims.fao.org/aos/agrovoc/c_35118 http://aims.fao.org/aos/agrovoc/c_36230 Cameroun http://aims.fao.org/aos/agrovoc/c_1229 Given its biological significance, determining the dispersal kernel (i.e., the distribution of dispersal distances) of sporeproducing pathogens is essential. Here, we report two field experiments designed to measure disease gradients caused by sexually- and asexually-produced spores of the wind-dispersed banana plant fungus Mycosphaerella fijiensis. Gradients were measured during a single generation and over 272 traps installed up to 1000 m along eight directions radiating from a traceable source of inoculum composed of fungicide-resistant strains. We adjusted several kernels differing in the shape of their tail and tested for two types of anisotropy. Contrasting dispersal kernels were observed between the two types of spores. For sexual spores (ascospores), we characterized both a steep gradient in the first few metres in all directions and rare long-distance dispersal (LDD) events up to 1000 m from the source in two directions. A heavy-tailed kernel best fitted the disease gradient. Although ascospores distributed evenly in all directions, average dispersal distance was greater in two different directions without obvious correlation with wind patterns. For asexual spores (conidia), few dispersal events occurred outside of the source plot. A gradient up to 12.5 m from the source was observed in one direction only. Accordingly, a thin-tailed kernel best fitted the disease gradient, and anisotropy in both density and distance was correlated with averaged daily wind gust. We discuss the validity of our results as well as their implications in terms of disease diffusion and management strategy. article info:eu-repo/semantics/article Journal Article info:eu-repo/semantics/publishedVersion http://agritrop.cirad.fr/573903/1/document_573903.pdf application/pdf Cirad license info:eu-repo/semantics/openAccess https://agritrop.cirad.fr/mention_legale.html https://doi.org/10.1371/journal.pone.0103225 10.1371/journal.pone.0103225 info:eu-repo/semantics/altIdentifier/doi/10.1371/journal.pone.0103225 info:eu-repo/semantics/altIdentifier/purl/https://doi.org/10.1371/journal.pone.0103225 |
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H20 - Maladies des plantes Musa Mycosphaerella fijiensis transmission des maladies agent pathogène spore fongique distribution spatiale http://aims.fao.org/aos/agrovoc/c_4993 http://aims.fao.org/aos/agrovoc/c_27259 http://aims.fao.org/aos/agrovoc/c_2329 http://aims.fao.org/aos/agrovoc/c_5630 http://aims.fao.org/aos/agrovoc/c_35118 http://aims.fao.org/aos/agrovoc/c_36230 http://aims.fao.org/aos/agrovoc/c_1229 H20 - Maladies des plantes Musa Mycosphaerella fijiensis transmission des maladies agent pathogène spore fongique distribution spatiale http://aims.fao.org/aos/agrovoc/c_4993 http://aims.fao.org/aos/agrovoc/c_27259 http://aims.fao.org/aos/agrovoc/c_2329 http://aims.fao.org/aos/agrovoc/c_5630 http://aims.fao.org/aos/agrovoc/c_35118 http://aims.fao.org/aos/agrovoc/c_36230 http://aims.fao.org/aos/agrovoc/c_1229 |
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H20 - Maladies des plantes Musa Mycosphaerella fijiensis transmission des maladies agent pathogène spore fongique distribution spatiale http://aims.fao.org/aos/agrovoc/c_4993 http://aims.fao.org/aos/agrovoc/c_27259 http://aims.fao.org/aos/agrovoc/c_2329 http://aims.fao.org/aos/agrovoc/c_5630 http://aims.fao.org/aos/agrovoc/c_35118 http://aims.fao.org/aos/agrovoc/c_36230 http://aims.fao.org/aos/agrovoc/c_1229 H20 - Maladies des plantes Musa Mycosphaerella fijiensis transmission des maladies agent pathogène spore fongique distribution spatiale http://aims.fao.org/aos/agrovoc/c_4993 http://aims.fao.org/aos/agrovoc/c_27259 http://aims.fao.org/aos/agrovoc/c_2329 http://aims.fao.org/aos/agrovoc/c_5630 http://aims.fao.org/aos/agrovoc/c_35118 http://aims.fao.org/aos/agrovoc/c_36230 http://aims.fao.org/aos/agrovoc/c_1229 Rieux, Adrien Soubeyrand, Samuel Bonnot, François Klein, Etienne Ngando Essoh Otto, Josué Mehl, Andréas Ravigné, Virginie Carlier, Jean De Lapeyre de Bellaire, Luc Long-distance wind-dispersal of spores in a fungal plant pathogen: Estimation of anisotropic dispersal kernels from an extensive field experiment |
description |
Given its biological significance, determining the dispersal kernel (i.e., the distribution of dispersal distances) of sporeproducing pathogens is essential. Here, we report two field experiments designed to measure disease gradients caused by sexually- and asexually-produced spores of the wind-dispersed banana plant fungus Mycosphaerella fijiensis. Gradients were measured during a single generation and over 272 traps installed up to 1000 m along eight directions radiating from a traceable source of inoculum composed of fungicide-resistant strains. We adjusted several kernels differing in the shape of their tail and tested for two types of anisotropy. Contrasting dispersal kernels were observed between the two types of spores. For sexual spores (ascospores), we characterized both a steep gradient in the first few metres in all directions and rare long-distance dispersal (LDD) events up to 1000 m from the source in two directions. A heavy-tailed kernel best fitted the disease gradient. Although ascospores distributed evenly in all directions, average dispersal distance was greater in two different directions without obvious correlation with wind patterns. For asexual spores (conidia), few dispersal events occurred outside of the source plot. A gradient up to 12.5 m from the source was observed in one direction only. Accordingly, a thin-tailed kernel best fitted the disease gradient, and anisotropy in both density and distance was correlated with averaged daily wind gust. We discuss the validity of our results as well as their implications in terms of disease diffusion and management strategy. |
format |
article |
topic_facet |
H20 - Maladies des plantes Musa Mycosphaerella fijiensis transmission des maladies agent pathogène spore fongique distribution spatiale http://aims.fao.org/aos/agrovoc/c_4993 http://aims.fao.org/aos/agrovoc/c_27259 http://aims.fao.org/aos/agrovoc/c_2329 http://aims.fao.org/aos/agrovoc/c_5630 http://aims.fao.org/aos/agrovoc/c_35118 http://aims.fao.org/aos/agrovoc/c_36230 http://aims.fao.org/aos/agrovoc/c_1229 |
author |
Rieux, Adrien Soubeyrand, Samuel Bonnot, François Klein, Etienne Ngando Essoh Otto, Josué Mehl, Andréas Ravigné, Virginie Carlier, Jean De Lapeyre de Bellaire, Luc |
author_facet |
Rieux, Adrien Soubeyrand, Samuel Bonnot, François Klein, Etienne Ngando Essoh Otto, Josué Mehl, Andréas Ravigné, Virginie Carlier, Jean De Lapeyre de Bellaire, Luc |
author_sort |
Rieux, Adrien |
title |
Long-distance wind-dispersal of spores in a fungal plant pathogen: Estimation of anisotropic dispersal kernels from an extensive field experiment |
title_short |
Long-distance wind-dispersal of spores in a fungal plant pathogen: Estimation of anisotropic dispersal kernels from an extensive field experiment |
title_full |
Long-distance wind-dispersal of spores in a fungal plant pathogen: Estimation of anisotropic dispersal kernels from an extensive field experiment |
title_fullStr |
Long-distance wind-dispersal of spores in a fungal plant pathogen: Estimation of anisotropic dispersal kernels from an extensive field experiment |
title_full_unstemmed |
Long-distance wind-dispersal of spores in a fungal plant pathogen: Estimation of anisotropic dispersal kernels from an extensive field experiment |
title_sort |
long-distance wind-dispersal of spores in a fungal plant pathogen: estimation of anisotropic dispersal kernels from an extensive field experiment |
url |
http://agritrop.cirad.fr/573903/ http://agritrop.cirad.fr/573903/1/document_573903.pdf |
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