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New strains of chickpea chlorotic dwarf virus discovered on diseased papaya and tomato plants in Burkina Faso

Ouattara A., Tiendrebeogo F., Lefeuvre P., Hoareau M., Claverie S., Traoré E.V., Barro N., Traoré O., Varsani A., Lett J.M.. 2017. Archives of Virology, 162 (6) : p. 1791-1794.

DOI: 10.1007/s00705-017-3262-z

This is the first description of full genome sequences of chickpea chlorotic dwarf virus (CpCDV; genus Mastrevirus; family Geminiviridae) identified in papaya and tomato plants sampled in Burkina Faso. The CpCDV full genome sequences from papaya and tomato share the highest pairwise sequence identity (84% and 93.5%) with Sudanese isolates of the CpCDV-K and CpCDV-M strains, respectively. Based on the strain demarcation threshold (>94% identity) for mastreviruses, we propose two new strains, CpCDV-Q and CpCDV-R, identified in papaya and tomato, respectively. Phylogenetic analysis confirmed that the sequences belong to a distinct clade of the highly diverse population of CpCDVs. Evidence of inter-strain recombination provided more support for the important role of recombination in CpCDV evolution. The discovery of CpCDV on papaya, a previously unsuspected host, raises many questions about the natural and potential host range of this dicot-infecting mastrevirus species that is reported to be emerging worldwide.

Mots-clés : virus des végétaux; identification; espèce nouvelle; solanum lycopersicum; carica papaya; génome; séquence nucléotidique; phylogénie; plante hôte; burkina faso; geminiviridae

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