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ARS Home » Midwest Area » Wooster, Ohio » Corn, Soybean and Wheat Quality Research » Research » Publications at this Location » Publication #365666
Research Project: Control of Virus Diseases in Corn and Soybean

Location: Corn, Soybean and Wheat Quality Research

Title: Sequiviruses and Waikaviruses (Secoviridae)

Author
item Stewart, Lucy

Submitted to: Encyclopedia of Virology
Publication Type: Book / Chapter
Publication Acceptance Date: 1/21/2020
Publication Date: 3/23/2021
Citation: Stewart, L.R. 2021. Sequiviruses and Waikaviruses (Secoviridae). Encyclopedia of Virology. vol. 3, pp. 703-711. Oxford: Academic Press.

Interpretive Summary: Plant viruses in the genera Sequivirus and Waikavirus are classified in the family Secoviridae. Parsnip yellow fleck virus (PYFV) is the type member of sequiviruses, while rice tungro spherical virus (RTSV) is the type member of genus Waikavirus. These plant viruses are transmitted by insects in a semipersistent manner, characterized by ‘helper’ phenomena. Virions are isometric particles composed of three capsid proteins encapsidating a monopartite, positive-sense, single-stranded RNA genome. Genomes are approximately 10 kb for sequiviruses and 12 kb for waikaviruses and encode a large proteolytically processed polyprotein. Isolates showing distinctive sequences and biological characteristics are found within virus species. Impact: This chapter summarizes the known biology and molecular biology of sequiviruses and waikaviruses and will be a global resource for scientists and students.

Technical Abstract: Viruses in the genera Sequivirus and Waikavirus are monopartite members of the family Secoviridae. Parsnip yellow fleck virus (PYFV) is the type member of sequiviruses, while rice tungro spherical virus (RTSV) is the type member of genus Waikavirus. These plant viruses are transmitted by insects in a semipersistent manner, characterized by ‘helper’ phenomena. Virions are isometric particles composed of three capsid proteins encapsidating a monopartite, positive-sense, single-stranded RNA genome. Genomes are approximately 10 kb for sequiviruses and 12 kb for waikaviruses and encode a large proteolytically processed polyprotein. Isolates showing distinctive sequences and biological characteristics are found within virus species.