Summary
The genusTrichovirus embraces five viral species (two definitive and three tentative) with similar biological, morphological, physicochemical, and ultrastructural properties. Viral replication is likely to occur in the cytoplasm, where virions accumulate in more or less loose bundles or paracrystalline aggregates. The genome is a 3′ polyadenylated, positive-sense, single stranded RNA of 7.5–8.7 kb in size. In definitive species (apple chlorotic leaf spot and potato T viruses), the genome is constructed of three slightly overlapping open reading frames coding for replication-related proteins (ORF 1), a putative movement protein (ORF 2), and the coat protein (ORF 3), respectively. ORFs 2 and 3 are probably expressed through subgenomic RNAs. Grapevine virus A (GVA) and grapevine virus B (GVB), two tentative species, may express an extra small open reading frame at the 3′ terminus, encoding, in the case of GVB, a polypeptide with homologies with the small RNA-binding protein of carlaviruses. The taxonomic relevance of this difference in genome organization remains to be ascertained.
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Agranowsky AA, Boyko VP, Karasev AV, Lunina NA, Koonin EV, Dolja W (1991) Nucleotide sequence of the 3′ terminal half of beet yellows closterovirus RNA genome: unique arrangement of eight virus genes. J Gen Virol 72: 15–23
Bar-Joseph M, Martelli GP (1991) Capillovirus group. In: Francki RIB, Fauquet CM, Knudson DL, Brown F (eds) Classification and nomenclature of viruses. Fifth Report of the International Committee on Taxonomy of Viruses. Springer, Wien New York, pp 339–340 (Arch Virol [Suppl] 2)
Bem F, Murant AF (1980) Heracleum latent virus. CMI/AAB Descriptions of Plant Viruses, no. 228
Boscia D, Savino V, Minafra A, Namba S, Elicio V, Castellano MA, Gonsalves D, Martelli GP (1993) Properties of a filamentous virus isolated from grapevine affected by corky bark. Arch Virol 130: 109–120
Boscia D, Abou-Ghanem N, Saldarelli P, Minafra A, Castellano MA, Garau R, Savino V, Martelli GP (1993) A comparison of grapevine virus B isolates. Extended abstracts, 11th Meeting ICVG, Montreux 1993, Federal Research Station of Changins, Nyon, Switzerland, pp 27–28
Candresse T (1993) Closteroviruses and clostero-like elongated plant viruses. In: Webster RG, Granoff A (eds) Encyclopedia of virology. Academic Press, New York (in press)
Conti M, Milne RG, Luisoni E, Boccardo G (1980) A closterovirus from a stem pitting-diseased grapevine. Phytopathology 70: 394–399
Foster GD (1992) Restructure and expression of the genome of carlaviruses. Res Virol 143: 103–112
German S, Candresse T, Lanneau M, Huet JC, Pernollet JC, Dunez J (1990) Nucleotide sequence and genomic organization of apple chlorotic leaf spot closterovirus. Virology 179: 104–112
German S, Candresse T, Le Gall O, Lanneau M, Dunez J (1992) Analysis of dsRNAs of apple chlorotic leaf spot virus. J Gen Virol 73: 767–773
Harrison BD, Finch JT, Gibbs AJ, Hollings M, Shepherd RJ, Valenta V, Wetter C (1971) Sixteen groups of plant viruses. Virology 45: 356–363
Koonin EV, Dolja VV (1993) Evolution and taxonomy of positive-strand RNA viruses: implications of comparative analysis of amino acid sequences. Crit Rev Biochem Mol Biol (in press)
Lister RM (1970) Apple chlorotic leaf spot virus. CMI/AAB Descriptions of Plant Viruses, no. 30
Lister RM (1970) Apple stem grooving virus. CMI/AAB Descriptions of Plant Viruses, no. 31
Martelli GP, Bar-Joseph M (1991) Closterovirus group. In: Francki RIB, Fauquet CM, Knudson DL, Brown F (eds) Classification and nomenclature of viruses. Fifth Report of the International Committee on Taxonomy of Viruses. Springer, Wien New York, pp 345–347 (Arch Virol [Suppl] 2)
Minafra A, Saldarelli P, Grieco F, Martelli GP (1994) Sequence of the 3′ terminal region of grapevine virus A and grapevine virus B (in prep.)
Ochi M, Kashiwazaki S, Hiratsuka K, Namba S, Tsuchizaki T (1992) Nucleotide sequence of the 3′ terminal region of potato virus T RNA. Ann Pytopathol Soc Japan 58: 416–425
Ohira K, Ito T, Kawai A, Namba S, Kusumi T, Tsuchizaki T (1993) Nucleotide sequence of the 3′ terminal region of citrus tatter leaf virus RNA. Virus Genes (submitted)
Ohira K, Namba S, Kawai A, Ito T, Kusumi T, Tsuchizaki T (1993) Nucleotide sequence of citrus tatter leaf capillovirus genome. Virus Genes (submitted)
Ohki ST, Yoshikawa N, Inouye N, Inouye T (1989) Comparative electron microscopyofChenopodium quinoa leaves infected with apple chlorotic leaf spot, apple stem grooving and citrus tatter leaf virus. Ann Phytopathol Soc Japan 55: 245–249
Rosciglione B, Castellano MA, Martelli GP, Savino V, Cannizzaro G (1983) Mealybug transmission of grapevine virus A. Vitis 22: 331–347
Salazar LF, Harrison BD (1978) Potato virus T. CMI/AAD Descriptions of Plant Viruses, no. 187
Sato K, Yoshikawa N, Takahashi T (1993) Complete nucleotide sequence of the genome of an apple isolate of apple chlorotic leaf spot virus. J Gen Virol 74: 1927–1931
Tollin P, Wilson HR, Roberts IM, Murant AF (1992) Diffraction studies of the particles of two closteroviruses: heracleum latent virus and heracleum virus 6. J Gen Virol 73: 3045–3048
Yoshikawa N, Sasaki E, Kato M, Takahashi T (1992) The nucleotide sequence of apple stem grooving capillovirus genome. Virology 191: 98–105
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Martelli, G.P., Candresse, T. & Namba, S. Trichovirus, a new genus of plant viruses. Archives of Virology 134, 451–455 (1994). https://doi.org/10.1007/BF01310583
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DOI: https://doi.org/10.1007/BF01310583