1. Institute of Crop Science/National Wheat Improvement Center, Chinese Academy of Agricultural Sciences (CAAS), Beijing 100081, China.
2. Institute of Cotton Research, Chinese Academy of Agricultural Sciences, Anyang, Henan 455112, China.
3. CIMMYT China Office, c/o CAAS, Beijing 100081, China.
4. Corresponding author. E-mail: zhhe@public3.bta.net.cn
5. BRI Australia Ltd, PO Box 7, North Ryde, NSW 2113, Australia.