1. Department of Plant Pathology, Nanjing Agricultural University, Nanjing 210095, P.R. China
2. Institute of Plant Protection, Hunan Academy of Agricultural Sciences, Changsha 410125, China
3. State Key Laboratory of Plant Cell and Chromosome Engineering, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China
4. Department of Plant Biology and The Genome Center, College of Biological Sciences, University of California, Davis, California 95616