1. The State Kay Laboratory for Rice Biology; Institute of Biotechnology, College of Agriculture and Biotechnology, Zhejiang University; Hangzhou 310058 Zhejiang China
2. Institute of Crop Science; College of Agriculture and Biotechnology, Zhejiang University; Hangzhou 310058 Zhejiang China
3. Electron Microscopy Center; Zhejiang University; Hangzhou Zhejiang 310058 China