1. College of Agronomy and Biotechnology, Southwest University, Chongqing 400715, China
2. Institute of Characteristic Crop Research, Chongqing Academy of Agricultural Sciences, Chongqing 402160, China
3. Academy of Agricultural Sciences, Southwest University, Chongqing 400715, China
4. Engineering Research Center of South Upland Agriculture, Ministry of Education, Chongqing 400715, China