Simultaneously Detection of Two Main Lanzhou Lily (Lilium davidii var. unicolor) Viruses by RT-PCR Effects of Lily symptomless virus on photosynthesis, activities of defense-related enzymes and chloroplast ultra-structure in lily Cloning of Lily symptomless virus CP Gene and Construction of Its RNAi Vector Cloning of Lily symptomless virus CP Gene and Construction of Its RNAi Vector Detection of Three Lily Viruses by Multiplex RT-PCR Gene Clone,Prokaryotic Expression of Lily symptomless virus 16 kD Gene and Preparation of Its Polyclonal Antibody Gene Clone,Prokaryotic Expression of Lily symptomless virus 16 kD Gene and Preparation of Its Polyclonal Antibody Detection of Lily symptomless virus and Lily mottle virus by Multiplex RT-PCR Detection of Lily symptomless virus and Lily mottle virus by Multiplex RT-PCR Detection of Three Lily Viruses by Multiplex RT-PCR