%0 Journal Article %A Teycheney, Pierre-Yves %A Tepfer, Mark %T Virus-specific spatial differences in the interference with silencing of the chs-A gene in non-transgenic petunia %D 2001 %J Journal of General Virology, %V 82 %N 5 %P 1239-1243 %@ 1465-2099 %R https://doi.org/10.1099/0022-1317-82-5-1239 %I Microbiology Society, %X 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. %U https://www.microbiologyresearch.org/content/journal/jgv/10.1099/0022-1317-82-5-1239