A new African streak virus species from Nigeria
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The African streak viruses (AfSVs) are a diverse group of mastrevirus species (family Geminiviridae) that infect a wide variety of annual and perennial grass species across the African continent and its nearby Indian Ocean islands. Six AfSV species (of which maize streak virus is the best known) have been described. Here we report the full genome sequences of eight isolates of a seventh AfSV species: Urochloa streak virus (USV), sampled from various locations in Nigeria. Despite there being good evidence of recombination in many other AfSV species, we found no convincing evidence that any of the USV sequences were either inter- or intra-species recombinants. The USV isolates, all of which appear to be variants of the same strain (their genome sequences are all more than 98% identical), share less than 69% nucleotide sequence identity with other currently described AfSV species.
KeywordsNIfo Streak Virus Inverted Repeat Sequence Recombination Signal Maize Streak Virus
This research was partially funded by the National Research Foundation (South Africa). A. V. is supported by the Carnegie Corporation of New York. D. N. S. is supported by PANNAR (Pty) Ltd; D. P. M. is supported by the Wellcome trust; B. O. is supported by the Rockefeller foundation through the USHEPiA programme; A. L. M. is supported by the Canon Collins Trust for Southern Africa and a University of Cape Town International Scholarship.
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