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- Title
Papaya ringspot virus-P: characteristics, pathogenicity, sequence variability and control.
- Authors
Tripathi, Savarni; Suzuki, Jon Y.; Ferreira, Stephen A.; Gonsalves, Dennis
- Abstract
Taxonomy: Papaya ringspot virus (PRSV) is an aphid-transmitted plant virus belonging to the genus Potyvirus, family Potyviridae, with a positive sense RNA genome. PRSV isolates belong to either one of two major strains, P or W. The P strains infect both papaya and cucurbits whereas the W strains infect only cucurbits. Geographical distribution: PRSV-P is found in all major papaya-growing areas. Physical properties: Virions are filamentous, non-enveloped and flexuous measuring 760–800 × 12 nm. Virus particles contain 94.5% protein and 5.5% nucleic acid. The protein component consists of the virus coat protein (CP), which has a molecular weight of about 36 kDa as estimated by Western blot analysis. Density of the sedimenting component in purified PRSV preparations is 1.32 g/cm3 in CsCl. Genome: The PRSV genome consists of a unipartite linear single-stranded positive sense RNA of 10 326 nucleotides with a 5′ terminus, genome-linked protein, VPg. Transmission: The virus is naturally transmitted via aphids in a non-persistent manner. Both the CP and helper component (HC-Pro) are required for vector transmission. This virus can also be transmitted mechanically, and is typically not seed-transmitted. Hosts: PRSV has a limited number of hosts belonging to the families Caricaceae, Chenopodiaceae and Cucurbitaceae. Propagation hosts are: Carica papaya, Cucurbita pepo and Cucumis metuliferus cv. accession 2459. Local lesion assay hosts are: Chenopodium quinoa and Chenopodium amaranticolor. Control: Two transgenic papaya varieties, Rainbow and SunUp, with engineered resistance to PRSV have been commercially grown in Hawaii since 1998. Besides transgenic resistance, tolerant varieties, cross-protection and other cultural practices such as isolation and rogueing of infected plants are used to manage the disease. Virus code: 00.057.0.01.045. Virus accession number: 57010045. Useful link:
- Subjects
PAPAYA ringspot disease; PAPAYA tree diseases &; pests; NUCLEIC acids; CHENOPODIACEAE; PLANT diseases; CUCURBITA pepo; PHYTOPATHOGENIC microorganisms; PLANT viruses; VIRUS diseases of plants; PAPAYA growing
- Publication
Molecular Plant Pathology, 2008, Vol 9, Issue 3, p269
- ISSN
1464-6722
- Publication type
Article
- DOI
10.1111/j.1364-3703.2008.00467.x