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Long-term viral competition monitoring: a case of epidemiological rescue

Péréfarres Frédéric, Thébaud Gaël, Lefeuvre Pierre, Hoareau Murielle, Rimbaud Loup, Chiroleu Frédéric, Reynaud Bernard, Lett Jean-Michel. 2013. Long-term viral competition monitoring: a case of epidemiological rescue. In : 14èmes Rencontres de virologie végétale (RVV 2013) : Aussois, France, 13-17 janvier 2013. Marais Armelle (ed.), Revers Frédéric (ed.). SFP, INRA. Paris : SFP, Résumé, 46. Rencontres de Virologie Végétale. 14, Aussois, France, 13 Janvier 2013/17 Janvier 2013.

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Résumé : Biological invasions are major threats to biodiversity and the main causes of emerging viral diseases. The ongoing spread of Tomato yellow leaf curl virus is a major concern to the sustainable tomato production throughout the world. The two main strains of TYLCV have been successively introduced in Reunion Island providing a fortuitous field experiment to study the invasion and competition of these two emerging strains in a tropical and insular environment. In this study, a seven-year field survey was performed following the introduction of the Israel strain of TYLCV (TYLCV-IL) into a niche occupied by the Mild strain of TYLCV (TYLCV-Mld). A displacement of the resident TYLCV-Mld by the newcomer TYLCV-IL was observed in this short period. To understand the factors associated with this displacement, biological traits related to fitness were measured to compare these strains. Besides demonstrating a better ecological aptitude of TYLCV-IL, which explains its rapid spread and increasing prevalence, the first estimate of the number of viral particles efficiently transmitted by an insect vector for a circulative virus was obtained. However, TYLCV-Mld persistence in the field (especially in mixed infections with TYLCV-IL) spurred further experiments regarding the effects of the mixed infections on these biological traits. Our study revealed complex interplay between these two strains of one of the most emergent plant virus following their successive introductions in the insular and tropical environment of Reunion Island. This rare case of unilateral facilitation between two pathogens led to the epidemiological rescue and maintenance of the less fit strain. (Texte intégral)

Classification Agris : H20 - Maladies des plantes

Auteurs et affiliations

  • Péréfarres Frédéric, Université de la Réunion (REU)
  • Thébaud Gaël, INRA (FRA)
  • Lefeuvre Pierre, CIRAD-BIOS-UMR PVBMT (REU)
  • Hoareau Murielle, CIRAD-BIOS-UMR PVBMT (REU)
  • Rimbaud Loup, Montpellier SupAgro (FRA)
  • Chiroleu Frédéric, CIRAD-BIOS-UMR PVBMT (REU) ORCID: 0000-0002-4874-5357
  • Reynaud Bernard, CIRAD-BIOS-UMR PVBMT (REU)
  • Lett Jean-Michel, CIRAD-BIOS-UMR PVBMT (REU)

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Source : Cirad - Agritrop (https://agritrop.cirad.fr/568025/)

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