Virome release of an invasive exotic plant species in southern France
Moubset O., Filloux D., Fontes H., Julian C., Fernandez E., Galzi S., Blondin L., Ben Chehida S., Lett J.M., Mesleard F., Kraberger S., Custer J.M., Salywon A.M., Makings E., Marais A., Chiroleu F., Lefeuvre P., Martin D.P., Candresse T., Varsani A., Ravigné V., Roumagnac P.. 2024. Virus Evolution, 10 (1) : 16 p..
DOI: 10.1093/ve/veae025
The increase in human-mediated introduction of plant species to new regions has resulted in a rise of invasive exotic plant species (IEPS) that has had significant effects on biodiversity and ecosystem processes. One commonly accepted mechanism of invasions is that proposed by the enemy release hypothesis (ERH), which states that IEPS free from their native herbivores and natural enemies in new environments can outcompete indigenous species and become invasive. We here propose the virome release hypothesis (VRH) as a virus-centered variant of the conventional ERH that is only focused on enemies. The VRH predicts that vertically transmitted plant-associated viruses (PAV, encompassing phytoviruses and mycoviruses) should be co-introduced during the dissemination of the IEPS, while horizontally transmitted PAV of IEPS should be left behind or should not be locally transmitted in the introduced area due to a maladaptation of local vectors. To document the VRH, virome richness and composition as well as PAV prevalence, co-infection, host range, and transmission modes were compared between indigenous plant species and an invasive grass, cane bluestem (Bothriochloa barbinodis), in both its introduced range (southern France) and one area of its native range (Sonoran Desert, Arizona, USA). Contrary to the VRH, we show that invasive populations of B. barbinodis in France were not associated with a lower PAV prevalence or richness than native populations of B. barbinodis from the USA. However, comparison of virome compositions and network analyses further revealed more diverse and complex plant–virus interactions in the French ecosystem, with a significant richness of mycoviruses. Setting mycoviruses apart, only one putatively vertically transmitted phytovirus (belonging to the Amalgaviridae family) and one putatively horizontally transmitted phytovirus (belonging to the Geminiviridae family) were identified from B. barbinodis plants in the introduced area. Collectively, these
Mots-clés : virus des végétaux; geminiviridae; espèce envahissante; bothriochloa; introduction de plantes; vecteur de maladie; transmission des maladies; taxonomie; identification; france; bothriochloa barbinodis
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Agents Cirad, auteurs de cette publication :
- Blondin Laurence — Bios / UMR PHIM
- Chiroleu Frédéric — Bios / UMR PVBMT
- Fernandez Emmanuel — Bios / UMR PHIM
- Filloux Denis — Bios / UMR PHIM
- Galzi Serge — Bios / UMR PHIM
- Julian Charlotte — Bios / UMR PHIM
- Lefeuvre Pierre — Bios / UMR PVBMT
- Lett Jean-Michel — Bios / UMR PVBMT
- Ravigné Virginie — Bios / UMR PHIM
- Roumagnac Philippe — Bios / UMR PHIM