Potato late blight caused by Phytophthora infestans is the most devastating disease in potato. The objective of this study was to test the efficiency of plant-meidated RNAi in silencing genes in P. infestans and to find a new way to breed potato resistant to late blight. Over-lap PCR was employed to amplify a fused-gene C1234 simultaneously homologous to four cellulose synthase genes in P. infenstans. Then, a plant expression vector containing inverted repeat of C1234 was constructed and transferred to Atla...