This study was to investigate the influence of SPVD on the growth devel- opment and yield formation of sweet potato, The virus seeding, landrace, virus-free seedlings of high starch sweet potato XichengO07 were inoculated with SPVD for revealing the interaction mechanism, The results showed that SPVD could result in clustering and dwarfing of sweet potato plant type, smaller leaves and lower effec- tive of leaf area, reduced chlorophyll content, and smaller source, lowered assimila- tive ability and photosynthetic capacity. The flow became smaller, further finally led to the reduced biological yield, and the desorption of SPVD could increase leaf ＂source＂ and the chlorophyll content, improve photosynthetic and flow ability, thus raising the output of production. SPVD could reduce the activities of SOD, POD and CAT in sweet potato plant, increase the content of MDA, decrease antioxidant activity and production, damage the cell membrane. However, virus-free treatment could increase the activities of SOD, POD and CAT in plants, which was helpful to reduce the harm of MDA. After the desorption of SPVD, the production of above- ground was increased by 3.4% and the production of fresh sweet potato was up by 2.9%, while SPVD dissemination could result in the reduction of the aboveground and fresh tubers by 69.9% and 49.1%, respectively.
