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| Maize dwarf mosaic virus | |
|---|---|
| Name | Maize dwarf mosaic virus |
| Virus group | Potyvirus |
| Familia | Potyviridae |
| Genus | Potyvirus |
| Species | Maize dwarf mosaic virus |
| Synonyms | MDMV |
Maize dwarf mosaic virus is a positive-sense single-stranded RNA plant pathogen in the family Potyviridae that infects cereals and grasses, causing yield-reducing mosaic diseases in maize. First described in North American agronomic contexts, the virus has been the subject of plant pathology, virology, and agricultural extension research across United States, Canada, Mexico, and parts of South America and Africa. Work on its molecular biology, vector ecology, and resistant germplasm has linked studies across institutions such as Iowa State University, University of Illinois Urbana-Champaign, and International Maize and Wheat Improvement Center.
MDMV belongs to the genus Potyvirus within the family Potyviridae and is classified among filamentous, flexuous rod-shaped virions. Its monopartite positive-sense RNA genome encodes a single large polyprotein processed by viral proteases into mature proteins including P1, HC-Pro, P3, 6K1, CI, 6K2, NIa-VPg, NIa-Pro, NIb, and CP; these coding regions have been analyzed in comparative genomics alongside Tobacco etch virus, Sugarcane mosaic virus, Turnip mosaic virus, and Potato virus Y. Phylogenetic studies using coat protein and NIb sequences have placed different MDMV isolates into lineages correlated with geographic origin and host range, employing methods from Carl Woese-inspired molecular systematics and computational tools developed at places like Cold Spring Harbor Laboratory and National Center for Biotechnology Information. Structural and functional analyses of HC-Pro and NIa-Pro proteins have been informed by biochemical assays popularized in laboratories at University of California, Davis and John Innes Centre.
Primary hosts include Zea mays cultivars, with secondary hosts among wild and cultivated grasses such as Sorghum bicolor, Panicum miliaceum (millet), and species in the genera Panicum, Setaria, Digitaria, and Paspalum. Infected plants display systemic mosaic, chlorotic streaks, dwarfing, and leaf deformation, symptoms that can be confused with nutrient deficiency assessments used in crop management at extension services like USDA county programs and diagnostic clinics at University of Florida. Symptom expression varies with maize hybrid, developmental stage, and environmental conditions studied in field trials at CIMMYT and University of Nebraska–Lincoln.
MDMV is primarily transmitted in a nonpersistent manner by aphid vectors including Rhopalosiphum maidis (corn leaf aphid), Aphis gossypii (cotton aphid), Myzus persicae (green peach aphid), and other aphid species monitored by entomology programs at Cornell University and USDA ARS. Epidemiological dynamics depend on vector migration patterns influenced by climatic drivers studied by groups at NASA and National Oceanic and Atmospheric Administration. Long-distance spread has been facilitated by commercial seed movement regulated by agencies such as International Seed Testing Association and national plant protection organizations like Canadian Food Inspection Agency. Modeling of outbreaks has used frameworks developed by researchers linked to University of California, Berkeley and London School of Hygiene & Tropical Medicine for vector-borne disease dynamics.
Routine diagnosis uses serological assays such as enzyme-linked immunosorbent assay (ELISA) developed in laboratories like Agdia and molecular methods including reverse transcription polymerase chain reaction (RT-PCR) protocols standardized by research groups at INRAE and Agriculture and Agri-Food Canada. Next-generation sequencing workflows applied at centers such as Broad Institute and bioinformatics pipelines at European Bioinformatics Institute allow genome assembly and variant detection. Field diagnostics incorporate lateral flow devices distributed by commercial providers and conducted alongside extension outreach at institutions including Texas A&M University.
Integrated management combines use of resistant hybrids developed through breeding programs at CIMMYT, Iowa State University, and private seed companies like Pioneer Hi-Bred International; cultural practices such as planting date adjustment informed by seasonal forecasts from National Weather Service; vector management via insecticide application protocols recommended by Pennsylvania State University extension; and certified seed programs overseen by Association of Official Seed Certifying Agencies. Biotechnological approaches evaluating transgenic and gene-editing resistance have been pursued in collaborations involving Monsanto (now part of Bayer) and public research at University of Wisconsin–Madison.
MDMV causes economic losses through reduced grain yield and quality, influencing commodity markets monitored by Chicago Board of Trade, USDA Economic Research Service, and export regulators in Mexico and Brazil. Regional surveys and economic assessments published with authors affiliated to CIMMYT, International Food Policy Research Institute, and national ministries of agriculture quantify impacts in terms of reduced yield and management costs. Distribution spans temperate and tropical maize-producing regions including parts of United States, Mexico, Argentina, Brazil, South Africa, and Egypt, with incidence influenced by cropping systems promoted by agencies like Food and Agriculture Organization.
The virus was first characterized during maize disease surveys in mid-20th-century North America, with early descriptions appearing in reports associated with Iowa State College and extension bulletins distributed by USDA. Molecular characterization accelerated with advent of RT-PCR and sequencing technologies from institutions such as Sanger Centre and National Institutes of Health. Contemporary research priorities include resistance breeding at CIMMYT and University of Guelph, aphid ecology studies at Australian National University, and viral evolution research at Max Planck Institute for Evolutionary Biology. Collaborative networks including Global Crop Diversity Trust and regional plant health initiatives continue to coordinate surveillance, while published reviews in journals like Phytopathology, Virology, and Molecular Plant-Microbe Interactions synthesize advances.
Category:Viral plant pathogens and diseases