During their lifetime, perennial woody plants are expected to face multiple infection events. Furthermore, multiple genotypes of individual virus species may co-infect the same host. This may eventually lead to a situation where plants harbor complex communities of viral species/strains. Using high-throughput sequencing, we describe co-infection of sweet and sour cherry trees with diverse genomic variants of two closely related viruses, namely prunus virus F (PrVF) and cherry virus F (CVF). Both viruses are most homologous to members of the Fabavirus genus (Secoviridae family). The comparison of CVF and PrVF RNA2 genomic sequences suggests that the two viruses may significantly differ in their expression strategy. Indeed, similar to comoviruses, the smaller genomic segment of PrVF, RNA2, may be translated in two collinear proteins while CVF likely expresses only the shorter of these two proteins. Linked with the observation that identity levels between the coat proteins of these two viruses are significantly below the family species demarcation cut-off, these findings support the idea that CVF and PrVF represent two separate Fabavirus species.

Department of Plant Virology Institute of Plant Molecular Biology Biology Centre of the Academy of Sciences of the Czech Republic v v i 370 05 České Budějovice Czech Republic

Laboratory of Plant Pathology School of Agriculture Faculty of Agriculture Forestry and Natural Environment Aristotle University of Thessaloniki 54124 Thessaloniki Greece

UMR 1332 Biologie du Fruit et Pathologie INRA University of Bordeaux CS20032 F 33882 Villenave d'Ornon CEDEX France

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$a Koloniuk, Igor $u Department of Plant Virology, Institute of Plant Molecular Biology, Biology Centre of the Academy of Sciences of the Czech Republic, v.v.i., 370 05 České Budějovice, Czech Republic. koloniuk@umbr.cas.cz.

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$a Variability Studies of Two Prunus-Infecting Fabaviruses with the Aid of High-Throughput Sequencing / $c I. Koloniuk, T. Sarkisova, K. Petrzik, O. Lenz, J. Přibylová, J. Fránová, J. Špak, L. Lotos, C. Beta, A. Katsiani, T. Candresse, VI. Maliogka,

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$a During their lifetime, perennial woody plants are expected to face multiple infection events. Furthermore, multiple genotypes of individual virus species may co-infect the same host. This may eventually lead to a situation where plants harbor complex communities of viral species/strains. Using high-throughput sequencing, we describe co-infection of sweet and sour cherry trees with diverse genomic variants of two closely related viruses, namely prunus virus F (PrVF) and cherry virus F (CVF). Both viruses are most homologous to members of the Fabavirus genus (Secoviridae family). The comparison of CVF and PrVF RNA2 genomic sequences suggests that the two viruses may significantly differ in their expression strategy. Indeed, similar to comoviruses, the smaller genomic segment of PrVF, RNA2, may be translated in two collinear proteins while CVF likely expresses only the shorter of these two proteins. Linked with the observation that identity levels between the coat proteins of these two viruses are significantly below the family species demarcation cut-off, these findings support the idea that CVF and PrVF represent two separate Fabavirus species.

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$a Sarkisova, Tatiana $u Department of Plant Virology, Institute of Plant Molecular Biology, Biology Centre of the Academy of Sciences of the Czech Republic, v.v.i., 370 05 České Budějovice, Czech Republic. sarkisova@umbr.cas.cz.

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$a Petrzik, Karel $u Department of Plant Virology, Institute of Plant Molecular Biology, Biology Centre of the Academy of Sciences of the Czech Republic, v.v.i., 370 05 České Budějovice, Czech Republic. petrzik@umbr.cas.cz.

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$a Lenz, Ondřej $u Department of Plant Virology, Institute of Plant Molecular Biology, Biology Centre of the Academy of Sciences of the Czech Republic, v.v.i., 370 05 České Budějovice, Czech Republic. lenz@umbr.cas.cz.

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$a Přibylová, Jaroslava $u Department of Plant Virology, Institute of Plant Molecular Biology, Biology Centre of the Academy of Sciences of the Czech Republic, v.v.i., 370 05 České Budějovice, Czech Republic. pribyl@umbr.cas.cz.

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$a Fránová, Jana $u Department of Plant Virology, Institute of Plant Molecular Biology, Biology Centre of the Academy of Sciences of the Czech Republic, v.v.i., 370 05 České Budějovice, Czech Republic. jana@umbr.cas.cz.

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$a Špak, Josef $u Department of Plant Virology, Institute of Plant Molecular Biology, Biology Centre of the Academy of Sciences of the Czech Republic, v.v.i., 370 05 České Budějovice, Czech Republic. spak@umbr.cas.cz.

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$a Lotos, Leonidas $u Laboratory of Plant Pathology, School of Agriculture, Faculty of Agriculture, Forestry and Natural Environment, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece. llotos@agro.auth.gr.

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$a Beta, Christina $u Laboratory of Plant Pathology, School of Agriculture, Faculty of Agriculture, Forestry and Natural Environment, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece. chrismpeta@agro.auth.gr.

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$a Katsiani, Asimina $u Laboratory of Plant Pathology, School of Agriculture, Faculty of Agriculture, Forestry and Natural Environment, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece. meniakats@yahoo.gr.

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$a Candresse, Thierry $u UMR 1332 Biologie du Fruit et Pathologie, INRA, University of Bordeaux, CS20032, F-33882 Villenave d'Ornon CEDEX, France. thierry.candresse@inra.fr.

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$a Maliogka, Varvara I $u Laboratory of Plant Pathology, School of Agriculture, Faculty of Agriculture, Forestry and Natural Environment, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece. vmaliogk@agro.auth.gr.

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