1. a Department of Agronomy , Zhejiang University , Hangzhou , P.R. China
2. b Jiaxing Academy of Agricultural Sciences , Jiaxing , Zhejiang , P.R. China
3. c Division of Biochemistry and Molecular Biology , Institute of Biomedical and Life Science , University of Glasgow , Glasgow , Scotland , UK
4. d Zhejiang Provincial Seed Company , Hangzhou , Zhejiang , P.R. China