Maize streak virus

Maize streak virus (MSV) causes a plant disease, known as maize streak disease (MSD) in its major host. It is an insect-transmitted maize pathogen in the genus Mastrevirus of the family Geminiviridae that is endemic in sub-Saharan Africa and neighbouring Indian Ocean island territories such as Madagascar, Mauritius and La Reunion. The A-strain of MSV (MSV-A) causes sporadic maize streak disease epidemics throughout the maize growing regions of Africa.[1][2][3] MSV was first described by the South African entomologist Claude Fuller who referred to it in a 1901 report as "mealie variegation".[4]

Maize streak virus
Maize streak virus
Common namesMSV, streak of maize
Causal agentsMaize streak virus
Hostsmaize, Urochloa panicoides
Vectorsleafhoppers (Cicadulina mbila, and other Cicadulina species, such as C. storeyi, C. arachidis and C. dabrowski)
EPPO CodeMSV000
Distributionsub-Saharan Africa
Maize streak virus
Virus classification
(unranked): Virus
Realm: Monodnaviria
Kingdom: Shotokuvirae
Phylum: Cressdnaviricota
Class: Repensiviricetes
Order: Geplafuvirales
Family: Geminiviridae
Genus: Mastrevirus
Species:
Maize streak virus

The development of conventionally resistant maize varieties has been a priority since the 1950s in Kenya, Nigeria, South Africa and elsewhere, with a good deal of success: however, there are several genes associated with resistance, and breeding is complex. Transgenically resistant or genetically modified maize varieties were under development in South Africa,[5] but the project has terminated without field trials of the candidate maize lines that were developed.

MSV is mainly transmitted by Cicadulina mbila Naude, but other leafhopper species, such as C. storeyi, C. arachidis and C. dabrowski, are also able to transmit the virus.

Typical of all mastreviruses, MSV's circular, ~2.7-Kb monopartite single-stranded (ss) DNA genome encodes only four proteins. Bidirectional transcription from a long intergenic region (LIR) results in the virion-sense expression of a movement protein (MP) and a coat protein (CP), and the complementary-sense expression of the replication-associated proteins, Rep and RepA. Whereas the MP and CP are involved in virus movement and encapsidation,[6] Rep is an essential initiator of virus replication, and RepA is a regulator of host and viral gene transcription.[7][8][9][10] Due to genome size restrictions, MSV usurps host DNA replication and double-stranded DNA break repair proteins to replicate its genome via, respectively, rolling-circle[11] and recombination-dependent mechanisms.[12]

References
  1. Dionne N Shepherd; Darren P Martin; Eric Van Der Walt; Kyle Dent; Arvind Varsani; Ed Rybicki (2009), "Maize streak virus: an old and complex 'emerging' pathogen", Molecular Plant Pathology, 11 (1): 1–12, doi:10.1111/j.1364-3703.2009.00568.x, PMC 6640477, PMID 20078771
  2. Darren P. Martin & Dionne N. Shepherd (2009), "The epidemiology, economic impact and control of maize streak disease", Food Security, 1 (3): 305–315, doi:10.1007/s12571-009-0023-1
  3. Nilsa A. Bosque-Pérez (2000), "Eight decades of maize streak virus research", Virus Research, 71 (1–2): 107–121, doi:10.1016/S0168-1702(00)00192-1, PMID 11137166
  4. McAlister, A. (27 October 2010). "South Africa at front line of GM research". Media Club South Africa. Retrieved 21 October 2011.
  5. Dionne N. Shepherd; Tichaona Mangwende; Darren P. Martin; Marion Bezuidenhout; Frederik J. Kloppers; Charlene H. Carolissen; Adérito L. Monjane; Edward P. Rybicki & Jennifer A. Thomson (2007), "Maize streak virus-resistant transgenic maize: a first for Africa", Plant Biotechnology Journal, 5 (6): 759–767, CiteSeerX 10.1.1.584.7352, doi:10.1111/j.1467-7652.2007.00279.x, PMID 17924935
  6. Sondra G. Lazarowitz; Allison J. Pinder; Vernon D. Damsteegt & Stephen G. Rogers (1989), "Maize streak virus genes essential for systemic spread and symptom development", EMBO J, 8 (4): 1023–1032, doi:10.1002/j.1460-2075.1989.tb03469.x, PMC 400910, PMID 16453874
  7. Xiangcan Zhan; Kim A. Richardson; Ann Haley; Bret A. M. Morris (1993), "The Activity of the Coat Protein Promoter of Chloris Striate Mosaic Virus Is Enhanced by Its Own and C1-C2 Gene Products", Virology, 193 (1): 498–502, doi:10.1006/viro.1993.1153, PMID 8438584
  8. JMI Hofer; EL Dekker; HV Reynolds; CJ Woolston; BS Cox; PM Mullineaux (1992), "Coordinate Regulation of Replication and Virion Sense Gene Expression in Wheat Dwarf Virus", The Plant Cell, 4 (2): 213–223, doi:10.2307/3869574, JSTOR 3869574, PMC 160122, PMID 1633494
  9. Kathleen L. Hefferon; Yong-Sun Moon; Ying Fan (2006), "Multi-tasking of nonstructural gene products is required for bean yellow dwarf geminivirus transcriptional regulation", The FEBS Journal, 273 (19): 4482–4494, doi:10.1111/j.1742-4658.2006.05454.x, PMID 16972938
  10. S Collin; M Fernández-Lobato; P S Gooding; P M Mullineaux & C Fenoll (1996), "The two nonstructural proteins from wheat dwarf virus involved in viral gene expression and replication are retinoblastoma-binding proteins", Virology, 219 (1): 324–329, doi:10.1006/viro.1996.0256, PMID 8623550
  11. Keith Saunders; Andrew Lucy & John Stanley (1991), "DNA forms of the geminivirus African cassava mosaic virus consistent with a rolling circle mechanism of replication", Nucleic Acids Research, 19 (9): 2325–2330, doi:10.1093/nar/19.9.2325, PMC 329438, PMID 2041773
  12. Julia B. Erdmann; Dionne N. Shepherd; Darren P. Martin; Arvind Varsani; Edward P. Rybicki & Holger Jeske (2010), "Replicative intermediates of maize streak virus found during leaf development.", Journal of General Virology, 91 (4): 1077–1081, doi:10.1099/vir.0.017574-0, PMID 20032206
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