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Transfer of the 3' non-translated region of grapevine chrome mosaic virus RNA-1 by recombination to tomato black ring virus RNA-2 in pseudorecombinant isolates

Station de Pathologie Végétale, INRA, BP 81, 33883 Villenave d'Ornon Cedex, France

In grapevine chrome mosaic and tomato black ring viruses (GCMV and TBRV), as in many other nepoviruses, the 3' non-translated regions (3'NTR) are identical between the two genomic RNAs. We have investigated the structure of the 3'NTR of two recombinant isolates which contain GCMV RNA-1 and TBRV RNA-2. In these isolates, the 3'NTR of RNA-1 was transferred to RNA-2, thus restoring the 3' identity. The transfer occurred within three passages, and probably contributes to the spread of randomly appearing mutations from one genomic RNA to the other. The site of recombination is near the 3' end of the open reading frame.

^* Author for correspondence. Fax +33 56 84 32 22. e-mail legall@bordeaux.inra.fr

Received 6 December 1994; accepted 12 January 1995.

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