Fitopatologia - Artigos
URI permanente para esta coleçãohttps://locus.ufv.br/handle/123456789/11741
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Item Taxonomy of the order Mononegavirales: second update 2018(Archives of Virology, 2019-04) Zerbini, F. Murilo; Maes, Piet; Amarasinghe, Gaya K.; Ayllón, María A.; Basler, Christopher F.; Bavari, Sina; Blasdell, Kim R.; Briese, Thomas; Brown, Paul A.; Bukreyev, Alexander; Balkema-Buschmann, Anne; Buchholz, Ursula J.; Chandran, Kartik; Crozier, Ian; Swart, Rik L. de; Dietzgen, Ralf G.; Dolnik, Olga; Domier, Leslie L.In October 2018, the order Mononegavirales was amended by the establishment of three new families and three new genera, abolishment of two genera, and creation of 28 novel species. This article presents the updated taxonomy of the order Mononegavirales as now accepted by the International Committee on Taxonomy of Viruses (ICTV).Item Revision of Begomovirus taxonomy based on pairwise sequence comparisons(Archives of Virology, 2015-04-18) Zerbini, F. Murilo; Brown, Judith K.; Navas-Castillo, Jesús; Moriones, Enrique; Ramos-Sobrinho, Roberto; Silva, José C. F.; Fiallo-Olivé, Elvira; Briddon, Rob W.; Hernández-Zepeda, Cecilia; Idris, Ali; Malathi, V. G.; Martin, Darren P.; Rivera-Bustamante, Rafael; Ueda, Shigenori; Varsani, ArvindViruses of the genus Begomovirus (family Geminiviridae) are emergent pathogens of crops throughout the tropical and subtropical regions of the world. By virtue of having a small DNA genome that is easily cloned, and due to the recent innovations in cloning and low-cost sequencing, there has been a dramatic increase in the number of available begomovirus genome sequences. Even so, most of the available sequences have been obtained from cultivated plants and are likely a small and phylogenetically unrepresentative sample of begomovirus diversity, a factor constraining taxonomic decisions such as the establishment of operationally useful species demarcation criteria. In addition, problems in assigning new viruses to established species have highlighted shortcomings in the previously recommended mechanism of species demarcation. Based on the analysis of 3,123 full-length begomovirus genome (or DNA-A component) sequences available in public databases as of December 2012, a set of revised guidelines for the classification and nomenclature of begomoviruses are proposed. The guidelines primarily consider a) genus-level biological characteristics and b) results obtained using a standardized classification tool, Sequence Demarcation Tool, which performs pairwise sequence alignments and identity calculations. These guidelines are consistent with the recently published recommendations for the genera Mastrevirus and Curtovirus of the family Geminiviridae. Genome-wide pairwise identities of 91 % and 94 % are proposed as the demarcation threshold for begomoviruses belonging to different species and strains, respectively. Procedures and guidelines are outlined for resolving conflicts that may arise when assigning species and strains to categories wherever the pairwise identity falls on or very near the demarcation threshold value.Item ICTV virus taxonomy profile: Geminiviridae(Journal Of General Virology, 2017-02-08) Zerbini, F. Murilo; Briddon, Rob W; Idris, Ali; Martin, Darren P; Moriones, Enrique; Castillo, Jesús Navas; Bustamante, Rafael Rivera; Roumagnac, Philippe; Varsani, ArvindThe geminiviruses are a family of small, non-enveloped viruses with single stranded, circular DNA genomes of 2500–5200 bases. Geminiviruses are transmitted by various types of insect (whiteflies, leafhoppers, treehoppers and aphids). Members of the genus Begomovirus are transmitted by whiteflies, those in the genera Becurtovirus, Curtovirus, Grablovirus, Mastrevirus and Turncurtovirus are transmitted by specific leafhoppers, the single member of the genus Topocuvirus is transmitted by a treehopper and one member of the genus Capulavirus is transmitted by an aphid. Geminiviruses are plant pathogens causing economically important diseases in most tropical and subtropical regions of the world. This is a summary of the International Committee on Taxonomy of Viruses (ICTV) Report on the taxonomy of the Geminiviridae which is available at www.ictv.global/ report/geminiviridae.Item Virus taxonomy in the age of metagenomics(Nature Reviews Microbiology, 2017-03) Simmonds, Peter; Adams, Mike J.; Benko, Mária; Breitbart, Mya; Brister, J. Rodney; Zerbini, F. Murilo; Carstens, Eric B.; Davison, Andrew J.; Delwart, Eric; Gorbalenya, Alexander E.; Harrach, Balázs; Hull, Roger; King, Andrew M.Q.; Koonin, Eugene V.; Krupovic, Mart; Kuhn, Jens H.; Lefkowitz, Elliot J.; et al.The number and diversity of viral sequences that are identified in metagenomic data far exceeds that of experimentally characterized virus isolates. In a recent workshop, a panel of experts discussed the proposal that, with appropriate quality control, viruses that are known only from metagenomic data can, and should be, incorporated into the official classification scheme of the International Committee on Taxonomy of Viruses (ICTV). Although a taxonomy that is based on metagenomic sequence data alone represents a substantial departure from the traditional reliance on phenotypic properties, the development of a robust framework for sequence-based virus taxonomy is indispensable for the comprehensive characterization of the global virome. In this Consensus Statement article, we consider the rationale for why metagenomic sequence data should, and how it can, be incorporated into the ICTV taxonomy, and present proposals that have been endorsed by the Executive Committee of the ICTV.Item ICTV virus taxonomy Profile: Potyviridae(Journal of General Virology, 2017-02-09) Zerbini, F. Murilo; Wang, Aiming; Stenger, Drake; Rabenstein, Frank; Praveen, Shelly; Ohshima, Kazusato; López-Moya, Juan José; Kreuze, Jan; Chalam, Celia; Adams, Mike; Wylie, Stephen JThe Potyviridae is the largest family of RNA plant viruses, members of which have single-stranded, positive-sense RNA genomes and flexuous filamentous particles 680–900 nm long and 11–20 nm wide. There are eight genera, distinguished by the host range, genomic features and phylogeny of the member viruses. Genomes range from 8.2 to 11.3 kb, with an average size of 9.7 kb. Most genomes are monopartite but those of members of the genus Bymovirus are bipartite. Some members cause serious disease epidemics in cultivated plants. This is a summary of the International Committee on Taxonomy of Viruses (ICTV) Report on the taxonomy of the Potyviridae, which is available at www.ictv.global/report/potyviridae.