Characterization and diagnostic of Yam virus X (YVX) and Yam necrosis virus (YNV), two novel viruses infecting yams in Guadeloupe

Acina Manbole Isabelle Nina, Bonheur Lydiane, Anzala Fabiola, Gomez Rose-Marie, Lange Dominique, Faure Chantal, Marais Armelle, Pavis Claudie, Roumagnac Philippe, Filloux Denis, Candresse Thierry, Teycheney Pierre-Yves. 2013. Characterization and diagnostic of Yam virus X (YVX) and Yam necrosis virus (YNV), two novel viruses infecting yams in Guadeloupe. 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, p. 57. Rencontres de Virologie Végétale. 14, Aussois, France, 13 January 2013/17 January 2013.

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Abstract : Several viral species infecting cultivated yams (Dioscorea spp.) are known. They include viruses belonging to the families Alphaflexiviridae (genus Potexvirus), Betaflexiviridae (genus Carlavirus), Caulimoviridae (genus Badnavirus), Cucumoviridae (genus Cucumovirus) and Potyviridae (genera Macluravirus and Potyvirus). However, it is widely acknowledged that yet uncharacterized viral species are present in yam germplasm collections worldwide and could be propagated through the distribution of infected germplasm. Therefore, viruses are currently the major constraint for much needed exchanges and distribution of yam germplasm. In order to promote the safe exchange of yam germplasm conserved in the Guadeloupe Biological Resources Center of Tropical Plants (CRB-PT), searches for new virus species in yams were undertaken. In silico analyses of ESTs of Dioscorea alata were performed and unveiled the existence of sequences corresponding to several known genera of yam viruses, such as Badnavirus and Macluravirus, and also to families of unknown yam-associated viruses, including Geminiviridae and Secoviridae. RT-PCR were performed on crude extracts of symptomatic yams (D. alata, D. trifida) following direct binding of viral particles and using degenerate primers. Amplification products were cloned and sequenced. Some of them displayed significant levels of homology with potexviruses and with viruses of the family Secoviridae. The 3' ends of the corresponding viral genomes were successfully amplified by 3' RACE, cloned and sequenced. Phylogenetic analyses confirmed the existence in yams of one new viral species within the genus Potexvirus (tentatively named Yam virus X, YVX) and one within the family Secoviridae (tentatively named Yam necrosis virus, YNV). The experimental host range of both viruses was explored through mechanical inoculation on various herbaceous plants. Molecular diagnostic was developed for both YVX and YNV using direct binding reverse transcription PCR (DB-RT-PCR) and used to perform a prevalence study of both viruses in the Guadeloupe CRB-PT yam germplasm collection. (Texte intégral)

Classification Agris : H20 - Plant diseases
U30 - Research methods

Auteurs et affiliations

  • Acina Manbole Isabelle Nina, CIRAD-BIOS-UMR AGAP (GLP)
  • Bonheur Lydiane
  • Anzala Fabiola, INRA (GLP)
  • Gomez Rose-Marie, INRA (GLP)
  • Lange Dominique, INRA (GLP)
  • Faure Chantal, INRA (FRA)
  • Marais Armelle, INRA (FRA)
  • Pavis Claudie, INRA (GLP)
  • Roumagnac Philippe, CIRAD-BIOS-UMR BGPI (FRA) ORCID: 0000-0001-5002-6039
  • Filloux Denis, CIRAD-BIOS-UMR BGPI (FRA)
  • Candresse Thierry, INRA (FRA)
  • Teycheney Pierre-Yves, CIRAD-BIOS-UMR AGAP (GLP) ORCID: 0000-0002-9754-0745

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