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Viruses 2015, 7(4), 1853-1870;

A Current Overview of the Papaya meleira virus, an Unusual Plant Virus

Biotecnologia, Universidade Federal do Espírito Santo, Vitória 29040090, Espírito Santo, Brazil
Laboratorio GeMBio, Centro de Investigación Científica de Yucatán A.C., Mérida 97200, Yucatán, Mexico
Instituto Capixaba de Pesquisa, Assistência Técnica e Extensão Rural, Vitória 29050790, Espírito Santo, Brazil
These authors contributed equally to this work.
Author to whom correspondence should be addressed.
Academic Editor: Thomas Hohn
Received: 29 January 2015 / Revised: 26 March 2015 / Accepted: 30 March 2015 / Published: 8 April 2015
(This article belongs to the Section Viruses of Plants, Fungi and Protozoa)
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Papaya meleira virus (PMeV) is the causal agent of papaya sticky disease, which is characterized by a spontaneous exudation of fluid and aqueous latex from the papaya fruit and leaves. The latex oxidizes after atmospheric exposure, resulting in a sticky feature on the fruit from which the name of the disease originates. PMeV is an isometric virus particle with a double-stranded RNA (dsRNA) genome of approximately 12 Kb. Unusual for a plant virus, PMeV particles are localized on and linked to the polymers present in the latex. The ability of the PMeV to inhabit such a hostile environment demonstrates an intriguing interaction of the virus with the papaya. A hypersensitivity response is triggered against PMeV infection, and there is a reduction in the proteolytic activity of papaya latex during sticky disease. In papaya leaf tissues, stress responsive proteins, mostly calreticulin and proteasome-related proteins, are up regulated and proteins related to metabolism are down-regulated. Additionally, PMeV modifies the transcription of several miRNAs involved in the modulation of genes related to the ubiquitin-proteasome system. Until now, no PMeV resistant papaya genotype has been identified and roguing is the only viral control strategy available. However, a single inoculation of papaya plants with PMeV dsRNA delayed the progress of viral infection. View Full-Text
Keywords: papaya sticky disease; dsRNA genome virus; phytopathogenic virus; laticifers colonization papaya sticky disease; dsRNA genome virus; phytopathogenic virus; laticifers colonization

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Abreu, P.M.V.; Antunes, T.F.S.; Magaña-Álvarez, A.; Pérez-Brito, D.; Tapia-Tussell, R.; Ventura, J.A.; Fernandes, A.A.R.; Fernandes, P.M.B. A Current Overview of the Papaya meleira virus, an Unusual Plant Virus. Viruses 2015, 7, 1853-1870.

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