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Unformatted text preview: 2/2/2010 1 Circulative Circulative-Propagative Propagative Plant:Animal Viruses Plant:Animal Viruses Plant:Animal Viruses Plant:Animal Viruses There are currently 18 families ( dae ) of plant viruses; plus 81 genera ( virus ; not including viroids and other subviral agents). Not all genera are within assigned families at this time, and some new genera and families are not shown at right. Viruses in three of these families are plant:animal viruses . These are the families Rhabdoviridae, Reoviridae, Bunyarivirdae . The family Bunyaviridae is the largest family of viruses. The plant-infecting members of these families also infect and replicate in their insect vectors. Virions are structurally complex, containing double- or triple-shelled capsids composed of several virus-coded proteins. The genomes are double-stranded RNA and 10 - 12 chromosomal Reoviridae 10 - 12 chromosomal segments are common. Fijivirus Family REOVIRIDAE 10 genera Orthroreovirus host = vertebrates, no vector, 10 dsRNAs Orbivirus host = vertebrates (horse, sheep), arthropod vectors, 10 dsRNAs Rotavirus host = vertebrates, fecal oral transmission, 11 dsRNAs Coltivirus host = vertebrates, tick/mosquito vectors, 12 dsRNAs Aquareovirus host = aquatic hosts, 11 dsRNAs Cypovirus host = arthropods, 10 dsRNAs Fijivirus host = monocots, planthopper vectors, 10 12 dsRNAs Phytoreovirus host = monocots and dicots, leafhopper vectors, 12 dsRNAs Oryzavirus host = monocots, planthopper vectors, 10 dsRNAs Mycoreovirus host = fungi, no vector, 11 dsRNAs 2/2/2010 2 Phylogeny of Negative Strand Viruses Phylogeny of Negative Strand Viruses z Unrooted Unrooted phylogeny of phylogeny of some negative some negative strand RNA strand RNA viruses based viruses based on RdRp on RdRp Canine Canine Distemper Distemper Measles Measles Marburg & Ebola Marburg & Ebola Sonchus Sonchus Yellow Net Yellow Net Citrus Psorosis Citrus Psorosis on RdRp on RdRp relatedness relatedness z Evidence for co Evidence for co- evolutionary evolutionary relatedness relatedness among plant, among plant, insect and insect and animal viruses animal viruses Influenza Influenza Vesicular Vesicular Stomatis & Stomatis & Rabies Rabies Hanta Hanta Rift valley Fever Rift valley Fever Rice Stripe Rice Stripe Tomato Spotted Wilt Tomato Spotted Wilt Rhabdoviridae Virions range in size from 35 90 nm X 200 350 nm (vertebrate- infecting rhabdoviruses have shorter virions) Virions are the largest of the plant-infecting Core: N, P, L proteins sc4 G Protein Matrix Protein Host derived envelope Virions are ~70-75% protein, 2% RNA, ~25% lipid At least 3 virus-encoded proteins are associated with the genomic RNA within virions viruses 900 1000 S (TMV is 190 S ) and a density of 1.2 mg/ml (TMV is 1.325 mg/ml) Rhabdoviridae Bunyarivirdae Virions for all members are similar: complex, spherical, between 80 - 120 nm in diameter....
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