Imperatayellow mottle virus (IYMV,
Sobemovirus) was first described in 2008 in the south-western region of Burkina
Faso (West Africa). The genetic diversity of IYMV was not documented up to day.
In this study, the variability of CP of IYMV was evaluated through the
molecular characterization of 38 isolates collected in the western part of
Burkina Faso. Comparison of sequences of these new isolates and one IYMV
sequence available in GenBank revealed that the average nucleotide diversity
was low. The ratio of non-synonymous over synonymous nucleotide substitutions
per site was low, indicating a CP diversification under strong purifying
selection. Despite of the low nucleotide diversity, phylogenetic analyses
revealed segregation of IYMV isolates into
six major clades. There was no correlation of phylogenetic grouping of isolates based on geographical location. This is the first
study of the genetic diversity of IYMV.
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