Identification of a new pathotype of Bean yellow mosaic virus (BYMV) infecting blue passion fruit and some evolutionary characteristics of BYMV.

The modes of molecular evolution of the coat protein (CP) and 3' non-coding region (NCR) were investigated in Bean yellow mosaic virus (BYMV) isolates, including a new pathotype from blue passion fruit. In phylogenetic analysis, the new pathotype did not cluster with pathotypes or host groups described previously. Intraspecific recombinations involving the entire 3'-NCR and a variable portion of the 3'-terminal region of the CP gene were detected between a broad bean isolate and several isolates from monocots. Since the predicted secondary structure of the 3'-NCR correlated mostly with the botanical origin of isolates, a possible role of the 3'-NCR in BYMV host adaptation is proposed and discussed.