Circulative nonpropagative aphid transmission of nanoviruses: An oversimplified view

Sicard Anne, Zeddam Jean-Louis, Yvon Michel, Michalakis Yannis, Gutiérrez Serafin, Blanc Stéphane. 2015. Circulative nonpropagative aphid transmission of nanoviruses: An oversimplified view. Journal of Virology, 89 (19) : 9719-9726.

Quartile : Q1, Sujet : VIROLOGY

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Psychologie-éthologie-ergonomie

Résumé : Plant virus species of the family Nanoviridae have segmented genomes with the highest known number of segments encapsidated individually. They thus likely represent the most extreme case of the so-called multipartite, or multicomponent, viruses. All species of the family are believed to be transmitted in a circulative nonpropagative manner by aphid vectors, meaning that the virus simply crosses cellular barriers within the aphid body, from the gut to the salivary glands, without replicating or even expressing any of its genes. However, this assumption is largely based on analogy with the transmission of other plant viruses, such as geminiviruses or luteoviruses, and the details of the molecular and cellular interactions between aphids and nanoviruses are poorly investigated. When comparing the relative frequencies of the eight genome segments in populations of the species Faba bean necrotic stunt virus (FBNSV) (genus Nanovirus) within host plants and within aphid vectors fed on these plants, we unexpectedly found evidence of reproducible changes in the frequencies of some specific segments. We further show that these changes occur within the gut during early stages of the virus cycle in the aphid and not later, when the virus is translocated into the salivary glands. This peculiar observation, which was similarly confirmed in three aphid vector species, Acyrthosiphon pisum, Aphis craccivora, and Myzus persicae, calls for revisiting of the mechanisms of nanovirus transmission. It reveals an unexpected intimate interaction that may not fit the canonical circulative nonpropagative transmission.

Mots-clés Agrovoc : virus des végétaux, Aphididae, Aphis craccivora, Myzus persicae

Mots-clés complémentaires : Nanoviridae, Faba bean necrtic yellow virus

Classification Agris : H20 - Maladies des plantes

Champ stratégique Cirad : Axe 4 (2014-2018) - Santé des animaux et des plantes

Auteurs et affiliations

• Sicard Anne, INRA (FRA)
• Zeddam Jean-Louis, IRD (FRA)
• Yvon Michel, INRA (FRA)
• Michalakis Yannis, CNRS (FRA)
• Gutiérrez Serafin, CIRAD-BIOS-UMR CMAEE (FRA) ORCID: 0000-0002-5277-7239 - auteur correspondant
• Blanc Stéphane, INRA (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/590567/)

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