Modification of a viral satellite DNA-based gene silencing vector and its application to leaf or flower color change in Petunia hybrida

Gene silencing conserved in plants and animals is mediated by mechanisms that involve sequence- specific RNA degradation1,2]. Gene silencing has been proven to play an important role in the study of gene function. Recently, a procedure known as virus ind…

Modification of a viral satellite DNA-based gene silencing vector and its application to leaf or flower color change in Petunia hybrida

Virus-induced gene silencing offers a powerful reverse-genetic tool for the study of gene function in plants. We have previously reported ef- fective gene silencing of plant genes using a viral satellite DNA associated with Tomato yellow leaf curl China virus (TYLCCNV). In this study,we further modified the viral satellite DNA-based vector. The modified vector can induce sulfu (Su) gene silencing as effective as the original vector in Nicotiana ben- thamiana plants,but the new system simplifies pro- cedures for construction of vector derivative. Fur- thermore,a fragment of petunia Su or chalcone syn- thase (CHS) endogenous gene was inserted into the modified vector. When petunia plants were agro- inoculated with the modified vector carrying a Su or CHS gene,the Su silenced plants started to appear yellowing in veins of systemically infected upper leaves two weeks after agroinoculation,while the CHS silenced plants started to show flower color change one month after agroinoculation and later single-color flowers became mosaic.