Abstract
1 State Key Laboratories for Agro biotechnology/College of Biological Sciences, China Agricultural University, Beijing 100193, PR China
2 Departamento de Microbiología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, México D. F. 11340, Mexico
3 Agricultural Cultural Collection of China, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China
4 College of Life Science, Capital Normal University, Beijing 100037, PR China