Genetic divergence of tomato ringspot virus

Genetic divergence of tomato ringspot virus Tomato ringspot virus (ToRSV) has been detected in Chile, causing economically important diseases in a wide range of hosts. A ToRSV isolate was obtained from raspberry cv Heritage (Rasp-CL) showing leaf yellowing and stunting. The complete genome of Rasp-CL was sequenced by deep sequencing. The Rasp-CL RNA1 sequence shared 97.4 % nucleotide sequence identity with divergent RNA1 of isolate Rasp1-2014, while Rasp-CL RNA2 showed high divergence from all four isolates available in the database, sharing only 63.9-72.7 % nucleotide sequence identity. This difference was mainly based on the X4 coding region, which has been reported to be a high-variability region. Moreover, based on differences in the X4 region, three Rasp-CL RNA2 variants of different length were identified in the same host. One putative recombination event was identified between the Rasp-CL and GYV-2014 X4 genes. Phylogenetic analysis suggested that ToRSV isolates with currently available sequences form three distinct groups. Our results suggest that, for an accurate phylogenetic classification of ToRSV, it is necessary to obtain sequences of both RNAs. This is the first report of a complete ToRSV genome sequence from South America. Archives of Virology Springer Journals

Genetic divergence of tomato ringspot virus

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Springer Vienna
Copyright © 2016 by Springer-Verlag Wien
Biomedicine; Virology; Medical Microbiology; Infectious Diseases
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