1. State Key Laboratory of Crop Stress Biology for Arid Areas, College of Life Sciences, Northwest A&F University, 712100 Shaanxi, China
2. Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, 100081 Beijing, China
3. Institut für Biologie und Biotechnologie der Pflanzen, Westfälische Wilhelms Universität, 48149 Münster, Germany
4. Plant Nutrition Laboratory, Institute of Agricultural and Nutritional Sciences, Martin Luther University Halle-Wittenberg, 06108 Halle, Germany