Novel sugarcane streak and sugarcane streak Reunion mastreviruses from southern Africa and La Réunion
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The sugarcane infecting streak viruses (SISVs) are mastreviruses (Family Geminiviridae) belonging to a group of “African streak viruses” (AfSVs) that includes the economically devastating Maize streak virus (MSV). Although there are three currently described SISV species (Sugarcane streak virus [SSV], Sugarcane streak Egypt virus [SSEV] and Sugarcane streak Réunion virus [SSRV]), only one strain variant has been fully sequenced for each of these species and as a result very little is known about the diversity and evolutionary origins of the SCISVs. Here we present annotated full genome sequences of four new SISV isolates, including a new strain of both SSRV and SSV, and one potentially new SISV species, sampled from wild grasses in La Réunion and Zimbabwe. For the first time, we report the finding of SSRV isolates in Zimbabwe and SSV isolates on the island of La Réunion. Phylogenetic and recombination analyses indicate continent-wide SSRV strain diversity and that our isolate potentially representing a new SISV species is a recombinant.
KeywordsFull Genome Sequence Streak Virus Maize Streak Virus Indian Ocean Island Branch Point Sequence
This research was partially funded by the National Research Foundation (South Africa). AV is supported by the Carnegie Corporation of New York; DNS is supported by PANNAR (Pty) Ltd; DPM is supported by the Harry Oppenheimer Trust and the Sydney Brenner Fellowship; PL is supported by the French Ministère de la Recherche et de l’Enseignement Supérieur; BO is supported by the Rockefeller foundation through the USHEPiA programme; ALM is supported by the Canon Collins Trust for Southern Africa and a University of Cape Town International Scholarship.
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