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N55S是用N5088S为母本,常规晚粳品系R2000为父本杂交选育而成的粳型光敏核不育系。该不育系不育起点温度低,不育性稳定,在武汉自然条件下稳定不育期为28 d左右(8月初至9月初),易繁殖制种,米质优,配合力好,2009年8月通过湖北省科技厅技术鉴定,所配组合粳两优5519(N55S/R19)于2013年6月通过云南省品种审定。
N55S is a japonica photoperiod-sensitive genic male sterile line, which was bred by N5088S as female parent and conventional late japonica rice line R2000 as male parent. The male sterile line has a low starting point of male sterility and stable sterility. The sterility period of its natural condition in Wuhan is about 28 days (from early August to early September), which makes it easy for breeding and breeding. In August through the Hubei Provincial Science and Technology Department of technical appraisal, with the combination of japonica Liangyou 5519 (N55S / R19) in June 2013 passed the Yunnan variety validation.