1. College of Horticultural and Landscape Architecture, Southwest University, Chongqing 400716, People’s Republic of China.
2. Key Laboratory of Horticulture Science for Southern Mountainous Regions, Ministry of Education, Chongqing 400715, People’s Republic of China.
3. Semiarid Prairie Agricultural Research Centre, Agriculture and Agri-Food Canada (AAFC), 1 Airport Road, Swift Current, SK S9H 3X2, Canada.
4. Box 1030, 1 Airport Road, Swift Current, SK S9H 3X2, Canada.
5. Land Resource, AAFC, 51 Campus Drive, Saskatoon, SK S7N 5A8, Canada.
6. Brandon Research Centre, AAFC, 18th Street and Grand Valley Road, Brandon, MB R7A 5Y3, Canada.
7. Lethbridge Research Centre, AAFC, 5403 1 Avenue S, Lethbridge, AB T1J 4B1, Canada.
8. Melfort Research Centre, AAFC, P.O. Box 1240, Melfort, SK S0E 1A0, Canada.