New insights into the evolutionary history of geminiviruses derived through the discovery of divergent viruses isolated from wild plants

Bernardo Pauline, Golden Michael, Mohd A., Fernandez Emmanuel, Granier Martine, Rebelo A.G., Peterschmitt Michel, Martin Darren Patrick, Roumagnac Philippe. 2013. New insights into the evolutionary history of geminiviruses derived through the discovery of divergent viruses isolated from wild plants. In : 1st International Conference Wild Plant Pathosystems (WPP 2013), Olomouc, République Tchèque, 2-5 July 2013. s.l. : s.n., Résumé, 1 p. International Conference Wild Plant Pathosystems, Olomouc, République tchèque, 2 Juillet 2013/5 Juillet 2013.

Résumé : During a large scale "non a priori" survey in 2010 of South African plant-infecting single stranded DNA viruses, a highly divergent geminivirus genome was isolated from an uncultivated spurge, Euphorbia caput-medusae. In addition to being infectious in E. caputmedusae, the cloned viral genome was also infectious in the cultivated hosts, tomato and Nicotiana benthamiana. The virus, named Euphorbia caput-medusae Latent virus (EcmLV) due to the absence of infection symptoms displayed by its natural host, caused severe symptoms in both of the cultivated plant species. The genome organization of EcmLV is unique amongst geminiviruses and it likely expresses at least two proteins without any detectable homologues within public sequence databases. Although clearly a geminivirus, EcmLV is so divergent that we propose its placement within a new genus that we have tentatively named Capulavirus. Using the most divergent set of geminivirus genomes ever assembled, we detect strong evidence that recombination has likely been a primary process in the genus-level diversification of geminiviruses. We demonstrate how this insight, taken together with phylogenetic analyses of predicted coat protein and replication associated protein (Rep) amino acid sequences indicate that the most recent common ancestor of the geminiviruses was likely a dicot-infecting virus that, like modern day mastreviruses and becurtoviruses, expressed its Rep from a spliced complementary strand transcript.

Classification Agris : H20 - Maladies des plantes

Auteurs et affiliations

• Bernardo Pauline, CIRAD-BIOS-UMR BGPI (FRA)
• Golden Michael, Institute of Infectious Diseases and Molecular Medicine (ZAF)
• Mohd A., Indian Institute of Pulses Research (IND)
• Fernandez Emmanuel, CIRAD-BIOS-UMR BGPI (FRA)
• Granier Martine, CIRAD-BIOS-UMR BGPI (FRA)
• Rebelo A.G., Kirstenbosch Research Centre (ZAF)
• Peterschmitt Michel, CIRAD-BIOS-UMR BGPI (FRA) ORCID: 0000-0001-8709-9418
• Martin Darren Patrick, Institute of Infectious Diseases and Molecular Medicine (ZAF)
• Roumagnac Philippe, CIRAD-BIOS-UMR BGPI (FRA) ORCID: 0000-0001-5002-6039

Source : Cirad - Agritrop (https://agritrop.cirad.fr/573565/)

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