1. Key Laboratory of Microbial Resources, Ministry of Agriculture and Rural Affairs/ Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China
2. Departamento de Microbiología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, México D. F. 11340, México
3. Beijing Agro-Biotechnology Research Center, Beijing Academy of Agriculture and Forestry/Beijing Key Laboratory of Agricultural Genetic Resources and Biotechnology, Beijing 100097, PR China
4. Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, PR China