Abstract
The A-strain of maize streak virus (MSV-A; genus Mastrevirus, family Geminiviridae), the causal agent of maize streak disease, places a major constraint on maize production throughout sub-Saharan Africa. In West-African countries such as Nigeria, where maize is not cultivated year-round, this MSV strain is forced to overwinter in non-maize hosts. In order to both identify uncultivated grasses that might harbour MSV-A during the winter season and further characterise the diversity of related maize-associated streak viruses, we collected maize and grass samples displaying streak symptoms in a number of Nigerian maize fields. From these we isolated and cloned 18 full mastrevirus genomes (seven from maize and 11 from various wild grass species). Although only MSV-A isolates were obtained from maize, both MSV-A and MSV-F isolates were obtained from Digitaria ciliaris. Four non-MSV African streak viruses were also sampled, including sugarcane streak Reunion virus and Urochloa streak virus (USV) from Eleusine coacana, USV from Urochloa sp., maize streak Reunion virus (MSRV) from both Setaria barbata and Rottboellia sp., and a novel highly divergent mastrevirus from Axonopus compressus, which we have tentatively named Axonopus compressus streak virus (ACSV). Besides the discovery of this new mastrevirus species and expanding the known geographical and host ranges of MSRV, we have added D. ciliaris to the list of uncultivated species within which Nigerian MSV-A isolates are possibly able to overwinter.
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Acknowledgments
DPM and AV are supported by the National Research Foundation of South Africa. SK is supported by a School of Biological Sciences (University of Canterbury, New Zealand) scholarship. DNS is supported by PANNAR (Pty) Ltd.
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705_2014_2090_MOESM1_ESM.doc
Genome sequence annotations of ACSV [NG-g84-oba-2007]. Sequence regions either known or believed to have some biological function are marked on the nucleotide sequence alignment. (DOC 28 kb)
705_2014_2090_MOESM2_ESM.doc
Annotated replication-associated protein, coat protein and movement protein amino acid sequences of ACSV [NG-g84-oba-2007]. Highlighted are rolling-circle replication motifs (Rep), potential nuclear localization signals (CP), DNA-binding domains (CP and Rep), and a putative hydrophobic membrane-spanning domain (MP). (DOC 44 kb)
Appendix
Appendix
GenBank accession numbers:
MSV-F [NG-ng2-Zar-2011]: KJ437654
MSV-F [NG-ng3-Zar-2011]: KJ437655
MSV-F [NG-ng17-Sam-2011]: KJ437656
MSV-A [NG-ng13-Sam-2011]: KJ437657
MSV-A [NG-ng25-Mil-2011]: KJ437658
MSV-A [NG-ng32-Mil-2011]: KJ437659
MSV-A [NG-ng36-Mil-2011]: KJ437660
MSV-A [NG-ng4-Zar-2011]: KJ437661
MSV-A [NG-ng5-Zar-2011]: KJ437662
MSV-A [NG-ng6-Bin-2011]: KJ437663
MSV-A [NG-ng8-Ife-2011]: KJ437664
USV [NG-ng23-Sam1-2011]: KJ437665
USV [NG-ng27-mil21-2011]: KJ437666
USV [NG-ng28-mil1-2011]: KJ437667
SSRV-B [NG-ng1-Sam-2011]: KJ437668
MSRV [NG-ng11-Ife-2011]: KJ437669
MSRV [NG-NG9-Ife-2011 ]: KJ437670
ACSV [NG-g84-oba-2007]: KJ437671
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Oluwafemi, S., Kraberger, S., Shepherd, D.N. et al. A high degree of African streak virus diversity within Nigerian maize fields includes a new mastrevirus from Axonopus compressus . Arch Virol 159, 2765–2770 (2014). https://doi.org/10.1007/s00705-014-2090-7
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DOI: https://doi.org/10.1007/s00705-014-2090-7