1. Key Laboratory of Eco-Environments in Three Gorges Reservoir Region (Ministry of Education); Chongqing Engineering and Technology Research Center for Sweetpotato; School of Life Sciences; Southwest University; Chongqing 400715 People's Republic of China
2. School of Chemistry and Chemical Engineering; Chongqing University of Science and Technology; Chongqing 401331 People's Republic of China
3. College of Pharmaceutical Sciences; Southwest University; Chongqing 400715 People's Republic of China
4. China Rural Technology Development Center; Ministry of Science and Technology; Beijing 100045 People's Republic of China