1. Department of Horticulture, Foshan University, Foshan 528000, P.R. China
2. Microelement Research Center, Huazhong Agricultural University, Wuhan 430070, P.R. China
3. State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Science, Nanjing 210008, China
4. School of Food Science and Engineering, Foshan University, Foshan 528000, China
5. State Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
6. School of Life Science and Engineering, Foshan University, Foshan 528000, China
7. Institute of Cellular and Molecular Botany, University of Bonn, D-53115 Bonn, Germany
8. Tasmanian Institute for Agriculture, College of Science and Engineering, University of Tasmania, Hobart, Tas 7001, Australia