1. Beijing Advanced Innovation Center for Tree Breeding by Molecular Design College of Biological Sciences and Technology Beijing Forestry University Box 162 Beijing 100083 China
2. Gansu Provincial Key Laboratory of Aridland Crop Sciences Gansu Agricultural University Lanzhou 730070 China
3. Urat Desert‐Grassland Research Station Northwest Institute of Eco‐Environment and Resources Chinese Academy of Science Lanzhou 730000 China
4. Forest Botany and Tree Physiology University of Goettingen Göttingen 37077 Germany