Beijing Key Laboratory of Ornamental Plants Germplasm Innovation&Molecular Breeding;
National Engineering Research Center for Floriculture;
Beijing Laboratory of Urban and Rural Ecological Environment of Beijing Municipal Education Commission;
College of Landscape Architecture;
Beijing Forestry University;
Beijing 100083;
China;
Departmentof Landscape Architectrue;
Jiyang College of Zhejiang A&F University;
Zhuji;
Zhejiang 311800;
China;
Forsythia; Virus-induced gene silencing; phytoene desaturase; TRV; whole-plant level;