1. State Key Laboratory of Agricultural Microbiology; Huazhong Agricultural University; Wuhan 430070 Hubei Province People's Republic of China
2. The Provincial Key Lab of Plant Pathology of Hubei Province, College of Plant Science and Technology, Huazhong Agricultural University; Wuhan 430070 Hubei Province People's Republic of China
3. Department of Environmental Biology; University of Guelph; Guelph ON Canada