1. Department of Microbiology, Universidade Estadual de Londrina (UEL), Londrina, Paraná, Brazil
2. Embrapa Soja, Soil Biotechnology Laboratory, Londrina, Paraná, Brazil
3. Department of Agronomy, UEL, Londrina, Paraná, Brazil
4. Department of Preventive Veterinary Medicine, UEL, Londrina, Paraná, Brazil
5. Laboratory of Electron Microscopy and Microanalysis, UEL, Londrina, Paraná, Brazil