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1 Laboratoire de Biologie Cellulaire, INRA-Centre de Versailles, F-78026 Versailles Cédex
and2 Station de Pathologie Végétale, INRA-Domaine Saint-Maurice, B.P. 94, F-84143 Montfavet Cédex, France
Both positive [(+)] and negative [(-)] sense versions of two satellite RNA (satRNA) genes from cucumber mosaic virus (CMV), the necrogenic I17N and the non-necrogenic R, have been introduced into the genome of tobacco plants. On infection with satRNA-free CMV, satRNA was amplified in plants expressing each of the four genes. All four genes confer protection against CMV infection. However, co-inoculation of plants with viral RNA and CMV satRNA transcripts synthesized in vitro showed that (-) sense transcripts were less active than the corresponding (+) sense transcripts. This is the first report that (-) sense CMV satRNA transcripts can serve as a template for satRNA replication.
Present address: Laboratoire de Biochimie et Physiologie Végétales, INRA-Montpellier, 9 place Viala, F-34000 Montpellier Cédex 01, France.
Received 7 October 1993;
accepted 9 December 1993.
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