1. Department of Plant Pathology and the Genome Center; University of California; Davis California 95616 USA
2. Joint Bioenergy Institute; Emeryville; California 94710 USA
3. Key Laboratory of Crop Genetics and Physiology of Jiangsu Province, College of Agriculture; Yangzhou University; Yangzhou 225009 China
4. Key Laboratory of Plant Functional Genomics of the Ministry of Education; College of Agriculture; Yangzhou University; Yangzhou 225009 China
5. Rice Research Institute; Sichuan Agricultural University at Wenjiang; Chengdu 611130 China