1. Rice Research Institute; Sichuan Agricultural University; Chengdu 611130 China
2. Rice and Sorghum Research Institute; Sichuan Academy of Agricultural Sciences; Luzhou 646100 China
3. Department of Plant Pathology; College of Agronomy; Sichuan Agricultural University; Chengdu 611130 China
4. Institute of Plant Protection; Jiangsu Academy of Agricultural Sciences; Nanjing 210014 China