1 Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China; University of Chinese Academy of Sciences, Beijing 100049, China.
2 College of Grassland Science and Technology, China Agricultural University, Beijing 100193, China.
3 Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China.
4 Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China.
5 Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China; State Key Laboratory of Crop Germplasm Innovation and Molecular Breeding, Syngenta Group China, Beijing 102206, China; University of Chinese Academy of Sciences, Beijing 100049, China. Electronic address: qxie@genetics.ac.cn.