Authors: James M Crosslin Philip B Hamm William W Kirk Rosemarie W Hammond
Publish Date: 2010/03/11
Volume: 155, Issue: 4, Pages: 621-625
Abstract
Tobacco rattle virus TRV causes stem mottle on potato leaves and necrotic arcs and rings in potato tubers known as corky ringspot disease Recently TRV was reported in Michigan potato tubers cv FL1879 exhibiting corky ringspot disease Sequence analysis of the RNA1encoded 16kDa gene of the Michigan isolate designated MI1 revealed homology to TRV isolates from Florida and Washington Here we report the complete genomic sequence of RNA1 6791 nt and RNA2 3685 nt of TRV MI1 RNA1 is predicted to contain four open reading frames and the genome structure and phylogenetic analyses of the RNA1 nucleotide sequence revealed significant homologies to the known sequences of other TRV1 isolates The relationships based on the fulllength nucleotide sequence were different from than those based on the 16kDa gene encoded on genomic RNA1 and reflect sequence variation within a 20–25aa residue region of the 16kDa protein MI1 RNA2 is predicted to contain three ORFs encoding the coat protein CP a 376kDa protein ORF 2b and a 336kDa protein ORF 2c In addition it contains a region of similarity to the 3′ terminus of RNA1 including a truncated portion of the 16kDa cistron Phylogenetic analysis of RNA2 based on a comparison of nucleotide sequences with other members of the genus Tobravirus indicates that TRV MI1 and other North American isolates cluster as a distinct group TRV M11 is only the second North American isolate for which there is a complete sequence of the genome and it is distinct from the North American isolate TRV ORY The relationship of the TRV MI1 isolate to other tobravirus isolates is discussed
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