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Journal of General Virology (2001), 82, 1239-1243.
© 2001 Society for General Microbiology

Plant

Virus-specific spatial differences in the interference with silencing of the chs-A gene in non-transgenic petunia

Pierre-Yves Teycheney1 and Mark Tepfer1

Laboratoire de biologie cellulaire, INRA, F-78026 Versailles cedex, France1

Author for correspondence: Pierre-Yves Teycheney. Fax +33 1 30 83 30 99. e-mail teychene{at}versailles.inra.fr

Potyviruses, such as potato virus Y and tobacco etch virus, as well as cucumber mosaic cucumovirus, interfere with post-transcriptional gene silencing (PTGS). When RedStar-type Petunia hybrida cultivars, whose flowers have alternating white and pigmented sectors, were infected with these viruses, each virus induced a different pattern of restoration of floral anthocyanin pigmentation. Local reversion to coloured phenotypes in the white sectors, which occurred through interference with PTGS of the chalcone synthase A (chs-A) gene, was correlated with locally increased levels of chs-A mRNA and virus concentration. Our results show that virus infection can interfere with PTGS of a native plant gene, and that this can have profound effects on symptom expression.




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