title: Molecular characterisation of a novel recombinant Ribgrass mosaic virus strain FSHS.
abstract: BACKGROUND
  The genus Tobamovirus (Virgaviridae) comprises 33 accepted species with the recent addition of eight new viruses and is divided in to three subgroups based on the origin of assembly of the virion and host range. Within the subgroup 1 tobamoviruses the orchid-associated tobamovirus was hypothesized to be a chimeric derivative of recombinations between genome fragments from subgroup 3 and 1. Recombination events involving RdRp, movement and coat protein genes are recorded within subgroup 1 and 2. However natural recombinations have not previously been reported between subgroup 3 tobamoviruses.
  
  
  RESULTS
  The organization and phylogenetic analyses of the complete genome and the different ORFs placed the new isolate within the Ribgrass mosaic virus clade of subgroup 3 tobamoviruses. Recombination detection analyses indicated that the isolate was a chimeric genome with fragments of high similarity to Ribgrass mosaic virus (RMV) strains NZ-439 (HQ667978) and Actinidia-AC (GQ401365.1) infecting herbaceous Plantago sp. and woody Actinidia spp., respectively. The recombinant differed across the whole genome by 3-8 % from other published RMV genomes.
  
  
  CONCLUSIONS
  In this investigation we report an intra-specific recombination between RMV strains NZ-439 (HQ667978) and Actinidia-AC (GQ401365.1), in the replicase component between viral-methyltransferase and viral-helicase regions, resulting in a novel RMV strain FSHS (JQ319720.1) that represents the first described natural recombinant within the RMV cluster of subgroup 3 tobamoviruses.
authors.affiliation: School of Biological Sciences, The University of Auckland, Private Bag 92019, Auckland, New Zealand.
authors.forename: Ramesh R
authors.initials: RR
authors.lastname: Chavan
authors.affiliation: School of Biological Sciences, The University of Auckland, Private Bag 92019, Auckland, New Zealand. m.pearson@auckland.ac.nz.
authors.forename: Michael N
authors.initials: MN
authors.lastname: Pearson
mesh_terms: D016679:Genome, Viral; D016366:Open Reading Frames; D010802:Phylogeny; D011995:Recombination, Genetic; D017898:Tobamovirus / Q000145:classification* / Q000235:genetics*