Symptom evolution following the emergence of maize streak virus

Monjane Adérito Luis, Dellicour Simon, Hartnady Penelope, Oyeniran Kehinde A., Owor Betty E., Bezeidenhout Marion, Linderme Daphné, Syed Rizwan Ali, Donaldson Lara, Murray Shane, Rybicki Edward P., Kvarnheden Anders, Yazdkhasti Elhman, Lefeuvre Pierre, Froissart Rémy, Roumagnac Philippe, Shepherd Dionne Natalie, Harkins Gordon William, Suchard Marc, Lemey Philippe, Varsani Arvind, Martin Darren Patrick. 2020. Symptom evolution following the emergence of maize streak virus. eLife, 9:e51984, 19 p.

https://doi.org/10.7554/eLife.51984

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

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Quartile : Q1, Sujet : BIOLOGY

Résumé : For pathogens infecting single host species evolutionary trade-offs have previously been demonstrated between pathogen-induced mortality rates and transmission rates. It remains unclear, however, how such trade-offs impact sub-lethal pathogen-inflicted damage, and whether these trade-offs even occur in broad host-range pathogens. Here, we examine changes over the past 110 years in symptoms induced in maize by the broad host-range pathogen, maize streak virus (MSV). Specifically, we use the quantified symptom intensities of cloned MSV isolates in differentially resistant maize genotypes to phylogenetically infer ancestral symptom intensities and check for phylogenetic signal associated with these symptom intensities. We show that whereas symptoms reflecting harm to the host have remained constant or decreased, there has been an increase in how extensively MSV colonizes the cells upon which transmission vectors feed. This demonstrates an evolutionary trade-off between amounts of pathogen-inflicted harm and how effectively viruses position themselves within plants to enable onward transmission.

Mots-clés Agrovoc : virus striure du maïs, relation hôte pathogène, transmission des maladies, pouvoir pathogène, virulence, évolution maligne, chlorose, résistance génétique, virus de la striure du maïs

Mots-clés géographiques Agrovoc : Afrique du Sud

Classification Agris : H20 - Maladies des plantes
F30 - Génétique et amélioration des plantes

Champ stratégique Cirad : CTS 4 (2019-) - Santé des plantes, des animaux et des écosystèmes

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