Abstract
1 Key Laboratory of Agro-Microbial Resource and Application, Ministry of Agriculture/College of Biological Sciences, China Agricultural University, 100094 Beijing, PR China
2 Departamento de Microbiología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, 11340 México D. F., Mexico
3 Institute of Agricultural Resources and Regional Planning of Chinese Academy of Agricultural Sciences, 100081 Beijing, PR China