Molecular characterisation of a new tenuivirus from Festuca sp.

Abstract

A novel virus with a quadruple genome of negative-sense, single-stranded RNA was identified by high-throughput sequencing (HTS) in a grass sample from Saxony-Anhalt, Germany, and tentatively called Festuca stripe-associated virus (FSaV). The genome of FSaV consists of four segments and a total of 16,535 nucleotides (nt) which encode seven open reading frames (ORF). FSaV shares highest nt identity (between 72.84% to 80.74%) to Iranian wheat stripe virus (IWSV) and rice hoja blanca virus (RHBV). Additionally, pairwise comparisons between the amino acid sequences of the ORFs on the genome of FSaV and the corresponding ones on the genomes of the members of the Tenuvirus genus showed that FSaV shared 83.17% and 90.85% (amino acid) aa identity to IWSV. Moreover, the non-coding intergenic regions (ncIR) shared only between 49.5% to 60.87% nt identity to the corresponding regions on the IWSV genome. Based on the ICTV species demarcation, the results suggest that FSaV may represent a new species of the genus Tenuivirus. Plastid sequence analysis of the HTS data showed that the original host is a member of the genus Festuca most likely the species Festuca pratensis.