应用RT PCR一步法检测了PRSVYs株系在感病番木瓜及其抗病突变体植株体内的运转动态 ,结果表明 :在感病植株中 ,接种后 48hr接种叶的未接种部位可检出病毒 ,第 4天部分接种叶柄可检出病毒 ,第 6天植株各部位均能检出病毒 ;而在抗病植株中 ,接种后可以而且仅能在接种部位检出病毒 ;因而认为抗病突变体能够阻碍病毒从接种部位运出及 (或 )向未接种部位运入 RT-PCR one-step method was used to detect the movement of PRSVYs in susceptible papaya plants and their disease-resistant mutants. The results showed that the virus could be detected in the uninoculated sites of inoculated leaves 48h after inoculation, On the fourth day, some pests were inoculated to detect the virus. On the 6th day, the virus was detected in all parts of the plant. In the resistant plants, the virus could be detected only in the inoculated part after inoculation. Therefore, Hinder the virus from the inoculation site and / or into the non-inoculated site