【摘要】：正 In this research project, tobacco plants transformed with untranslatable PVY CP gene were used to examine therelationship between transgene integration patterns and RNA-mediated resistance more directly. Meanwhile we alsoinvestigated the transmission of RNA-mediated resistance and PVY movement on resistant plants and susceptibleplants. The results of Southern blot analysis indicated that almost all of the highly resistant plants contained repeatforeign sequences, including direct repeat (DR) and inverted repeat (IR). The highly resistant plants always con-tained both of or one of these constructs. While susceptible transgenic plants contained neither of them. Researchfrom different systems identified dsRNA as a joint of various forms of PTGS. Readthrough transcription of loci of for-