Abstract
Imperata yellow 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.
Highlights
The perennial grass Imperata cylindrica (L.) P
Within the frame of a 3-year harvest campaign in distinct areas of South-Western Burkina Faso (Figure 2), a total of 38 samples of I. cylindrica leaves were analyzed for Imperata yellow mottle virus detection
The basic residues R and K have similar properties we cannot say whether all substitutions at different positions in the bipartite targeting sequence have structural consequences on RNA encapsidation, stability of viral particles or other unknown properties of Coat Protein (CP) during the biological cycle of Imperata yellow mottle virus (IYMV). It remains to be determined if these amino acids substitutions involve biologically distinct strains. This is the first study of the genetic diversity of IYMV in Burkina Faso and we think that will allow contributing to a better understanding of IYMV evolution and epidemiology in Burkina Faso
Summary
The perennial grass Imperata cylindrica (L.) P. Only one viral disease has been reported that affects I. cylindrica, and was defined as the Imperata yellow mottle virus (IYMV) because of the typical mottled yellowing appearing at the I. cylindrica leaf surface. The virus has a crop host range including two cereals (Sorghum bicolor, Pennisetum glaucum) [5] and three wild grasses It remains unknown whether insects such as beetles or even the I. cylindrica seeds themselves can serve as vector for IYMV infection
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