1 Department of Molecular Physiology, Max-Planck-Institute of Molecular Plant Physiology, Am Mühlenberg 1, 14476 Potsdam, Germany. Electronic address: fernie@mpimp-golm.mpg.de.
2 National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan 430070, China. Electronic address: yjianbing@mail.hzau.edu.cn.