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| Tombusviridae | |
|---|---|
| Name | Tombusviridae |
| Virus group | IV |
| Realm | Riboviria |
| Kingdom | Orthornavirae |
| Phylum | Pisuviricota |
| Class | Pisoniviricetes |
| Order | Tolivirales |
| Family | Tombusviridae |
| Subdivision ranks | Genera |
Tombusviridae
Tombusviridae are a family of positive-sense single-stranded RNA plant viruses important in virology, plant pathology, and molecular biology research. Members infect a broad array of Asteraceae, Solanaceae, and other angiosperm hosts, and have served as models for studies in RNA replication, virus–host interactions, and virus evolution. Their small, icosahedral virions and compact genomes made them focal organisms in work associated with laboratories and institutions such as the Max Planck Society, John Innes Centre, and Cold Spring Harbor Laboratory.
Family-level classification places these viruses within the order Tolivirales and the realm Riboviria, reflecting conserved RNA-dependent RNA polymerase (RdRp) motifs shared with other positive-sense RNA viruses studied at centers like Pasteur Institute. Genera include well-known groups historically characterized by researchers at the Rothamsted Experimental Station and the University of California, Berkeley. Taxonomy is informed by phylogenetic analyses employing sequences from projects archived in databases maintained by organizations such as the International Committee on Taxonomy of Viruses and computational resources at European Bioinformatics Institute. Species demarcation often uses criteria developed in workshops hosted by the Food and Agriculture Organization and regional plant protection organizations like the North American Plant Protection Organization.
Virions are non-enveloped, roughly 28–35 nm in diameter, and display icosahedral symmetry studied using cryo-electron microscopy work at facilities like EMBL-EBI and the National Institutes of Health. The capsid is composed of a single coat protein that assembles into T=3 symmetry, a feature investigated in structural programs at the Max Planck Institute for Biophysical Chemistry and the University of Oxford. Genomes are monopartite or, in some genera, multipartite positive-sense RNA of ~4.5–5.5 kb encoding replication proteins, movement proteins, and coat protein; these genomic architectures were elucidated in collaborations involving the Salk Institute and sequencing centers such as Wellcome Sanger Institute. Conserved RNA elements include 3′-terminal structures, subgenomic promoters, and internal replication signals analyzed in molecular studies linked to Harvard Medical School and the University of Cambridge.
Replication initiates when virions enter host cells through wounds or vector-mediated transmission; uncoating and translation of viral RNA produce replication proteins including an RdRp with sequence motifs characterized in comparative work at Stanford University and the University of Tokyo. Replication complexes form on intracellular membranes, a phenomenon studied using electron tomography at the Max Planck Institute for Cell Biology and Genetics and fluorescent imaging in labs at MIT. Subgenomic RNAs are produced to express structural proteins, and systemic movement involves host factors such as plasmodesmata-associated proteins characterized in research at the John Innes Centre and University of Wageningen. Interactions with host RNA silencing pathways were clarified in experiments from groups at ETH Zurich and University of California, Davis.
Hosts comprise many dicotyledonous plants including economically important genera like Solanum, Capsicum, Lactuca, and Brassica, with infections recorded in both crop and wild species surveyed in studies by the International Rice Research Institute and regional agricultural services. Transmission occurs mechanically, via contaminated equipment and handling, and some species are transmitted by insect vectors or through seed; vector studies have been conducted by entomology groups at USDA Agricultural Research Service and CSIRO. Host susceptibility and emergence are influenced by agricultural practices evaluated in trials at institutions such as Iowa State University.
Infected plants exhibit symptoms including mosaic patterns, chlorosis, stunting, necrosis, and yield losses noted in case reports from extension services at University of Florida and crop protection advisories issued by FAO-affiliated programs. Outbreaks impacting vegetables and ornamentals have economic implications documented in analyses by the World Bank and regional trade reports from the European Commission. Epidemiological models incorporating climate data from agencies like the National Oceanic and Atmospheric Administration inform risk assessments for spread and seasonal dynamics.
Diagnostic approaches include symptom observation used by extension agents at University of California Cooperative Extension, serological assays such as ELISA developed in collaboration with research groups at Rockefeller University, and molecular detection using RT-PCR and qRT-PCR protocols standardized in laboratories at CDC and university diagnostic centers. High-throughput sequencing for metagenomic surveillance has been applied by sequencing facilities including Wellcome Sanger Institute and Baylor College of Medicine to discover novel species. Electron microscopy and immunogold labeling performed at microscopy centers like National Center for Electron Microscopy confirm virion morphology.
Management integrates phytosanitary measures promoted by USDA APHIS, cultural practices advised by extension services at institutions such as Cornell University, and vector control strategies developed in programs at CIMMYT. Breeding for resistance has utilized both conventional selection and transgenic approaches tested at research institutes like IRRI and universities including Michigan State University; marker-assisted selection and gene-editing strategies have been explored in collaborations with the Broad Institute and plant breeding centers. Integrated pest management programs and certification schemes administered by agencies such as the European and Mediterranean Plant Protection Organization reduce incidence in trade-sensitive crops.
Category:Plant viruses Category:RNA viruses