Y两优5558是上饶市农业科学研究所用不育系Y58S与自育的高配合力恢复系R5558配组育成的两系杂交一季稻新组合,2016年5月通过江西省农作物品种审定委员会审定,审定编号:赣审稻2016002。 Y Liangyou 5558 is a new two-line hybrid rice combination developed by Shangrao City Institute of Agricultural Sciences using sterile line Y58S and self-supporting high combining ability restorer line R5558. In May 2016, it was approved by Jiangxi Provincial Crop Variety Approval Committee, Validation No .: Gan trial rice 2016002.