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Scottish Crop Research Institute, Invergowrie, Dundee DD2 5DA, UK1
Author for correspondence: Lesley Torrance.Fax +44 1382 526426. e-mail ltorra{at}scri.sari.ac.uk
A spontaneous deletion in RNA 2 of Potato mop-top virus (PMTV) was identified by RTPCR. The deletion occurred reproducibly during manual passage of two isolates of PMTV and during fungal inoculation of plants with viruliferous soil. The borders of the deletion were conserved in all instances and sequence analyses showed that a contiguous segment of 2113 nucleotides was deleted internally from the genomic RNA 2, leaving the 5'- and 3'-terminal sequences. RTPCR experiments also showed that the deletion was present in preparations of PMTV particles.
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