Highly divergent isolates of two carlaviruses infecting chrysanthemum in Russia

Chrysanthemum is a popular ornamental and medicinal plant, suffering from many viruses and viroids. Among them, chrysanthemum virus B (CVB, genus Carlavirus, family Betaflexiviridae) is widespread in all chrysanthemum-growing regions. Another carlavirus, chrysanthemum virus R (CVR), has been recently discovered in China. Objective of this work was to study on the prevalence and genetic diversity of CVB and CVR in Russia.