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| Maize streak virus | |
|---|---|
| Name | Maize streak virus |
| Virus group | II (ssDNA) |
| Familia | Geminiviridae |
| Genus | Mastrevirus |
| Species | Maize streak virus |
Maize streak virus is a plant pathogenic virus that causes maize streak disease, a major constraint on Zea mays production across sub-Saharan Africa and parts of Madagascar and the Indian Ocean islands. First described during colonial agricultural surveys, it has been central to studies linking plant pathology with field trials led by institutions such as the International Maize and Wheat Improvement Center and national agricultural research systems in Kenya, Zambia, and Nigeria. The virus has informed broader work on virus evolution, vector ecology, and crop breeding programs coordinated by organizations like the Food and Agriculture Organization and the African Union.
Maize streak virus is classified in the family Geminiviridae and the genus Mastrevirus, a group defined by circular single-stranded DNA genomes and characteristic twinned icosahedral particles, and its taxonomic placement has been refined by collaborative taxonomic committees including the International Committee on Taxonomy of Viruses. Historical isolates have been compared to other mastreviruses from hosts such as Sorghum bicolor and Urochloa, and phylogenetic work often references reference sequences maintained by repositories like the National Center for Biotechnology Information and curated by networks involving the African Union Development Agency.
The virus possesses a circular single-stranded DNA genome of roughly 2.7 kilobases encoding replication-associated protein (Rep), movement protein (MP), and capsid protein (CP), and replication relies on host factors characterized in studies utilizing model systems related to Arabidopsis thaliana and work by laboratories affiliated with the University of Cambridge and University of Pretoria. Comparative genomics linking isolates from South Africa, Uganda, and Mozambique has elucidated recombination patterns cited in literature from groups at the John Innes Centre and the Max Planck Institute. Structural studies of geminivirus capsids have drawn on cryo-electron microscopy methods developed at institutions like the European Molecular Biology Laboratory.
Maize streak virus is transmitted in a persistent, circulative manner by cicadellid leafhoppers in the genus Cicadulina, with vector biology investigated in field programs run by the International Institute of Tropical Agriculture and university teams at Wageningen University. Vector competence and population dynamics have been linked to landscape factors studied in projects funded by the Bill & Melinda Gates Foundation and coordinated with national extension services in Malawi and Zimbabwe. Research into control of vectors has engaged entomologists at the Commonwealth Scientific and Industrial Research Organisation and entomology departments at the University of California, Davis.
Infected Zea mays plants display characteristic chlorotic streaks, stunting, and yield loss, symptoms described in surveys by colonial-era agronomists and modern diagnostic teams from the International Maize and Wheat Improvement Center and national ministries of agriculture such as those in Ghana and Tanzania. The virus infects various Poaceae hosts including Panicum, Sorghum bicolor, and wild Echinochloa species, with host-range studies published by researchers at the Commonwealth Mycological Institute and botanical collections in the Royal Botanic Gardens, Kew.
Maize streak disease has driven episodic epidemics linked to climatic variation across the Sahel, East Africa, and southern African regions, with economic assessments conducted by teams at the World Bank and the International Food Policy Research Institute. Yield losses documented in national crop statistics from Nigeria and Zambia have informed policy dialogues at meetings convened by the African Union and the United Nations Development Programme. Regional surveillance networks connected to the African Centre of Excellence programs contribute to mapping strain diversity and outbreak hotspots.
Detection methods include symptom observation, enzyme-linked immunosorbent assay protocols standardized by diagnostic laboratories associated with the International Laboratory for Research on Animal Diseases, polymerase chain reaction assays developed in molecular labs at the University of Oxford and sequence-based identification using platforms maintained by the European Nucleotide Archive. Recent advances apply loop-mediated isothermal amplification validated in workshops supported by the Bill & Melinda Gates Foundation and portable sequencing approaches trialed by teams from the Wellcome Trust.
Integrated management combines cultural practices such as adjusted planting dates promoted by extension networks in Kenya and Uganda, vector control measures studied by entomologists at the University of Pretoria, and deployment of resistant cultivars advanced by breeding programs at the International Maize and Wheat Improvement Center and national research institutes like the Kenya Agricultural and Livestock Research Organization. Regional initiatives supported by the Food and Agriculture Organization and capacity-building through the Commonwealth Secretariat emphasize farmer training and seed system strengthening.
Breeding for resistance has combined classical selection led by programs at the International Maize and Wheat Improvement Center with marker-assisted selection and transgenic approaches evaluated in containment by regulatory agencies such as the South African Department of Agriculture and biosafety bodies in Nigeria. Genetic loci conferring quantitative resistance have been mapped in collaboration with genomics centers at the John Innes Centre and the Donald Danforth Plant Science Center, and participatory varietal selection involving organizations like the African Union Development Agency has accelerated varietal uptake among smallholder farmers in Malawi and Zambia.
Category:Geminiviridae