1. College of Agronomy; Hunan Agricultural University; Changsha 410128 China
2. State Key Laboratory of Hybrid Rice; Hunan Hybrid Rice Research Center; Hunan Academy of Agricultural Sciences; Changsha 410125 China
3. Collaborative Innovation Center of Grain and Oil Crops in South China; Changsha 410128 China
4. China National Japonica Rice Research and Development Center; Tianjin 300457 China
5. State Key Laboratory for Crop Genetics and Germplasm Enhancement; Nanjing Agricultural University; Nanjing 210095 China