1. Ministry of Agriculture Key Laboratory of Crop Nutrition and Fertilization Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences Beijing 100081 China
2. Japan International Research Center for Agricultural Sciences 1‐1 Ohwashi Tsukuba Ibaraki 305‐8686 Japan
3. School of Life Sciences Yunnan Normal University Kunming Yunnan 650092 China
4. School of Plant Biology Univ. of Western Australia Crawley WA 6009 Australia