南粳50是以含低直链淀粉含量基因Wx-mq和条纹叶枯病抗性基因Stv-bi的日本优质粳稻关东194与江苏高产粳稻武粳13杂交，通过混合系谱法和分子标记辅助选择相结合的技术手段培育而成的优良食味、高产、多抗粳稻新品种。该品种株高适中，株型紧凑，长势较旺，分蘖力较强，穗型较大。650 kg/667 m2的产量结构为：有效穗数20万/667 m2，每穗总粒数140~150粒，结实率90%~95%，千粒重25 g左右。南粳50不仅抗稻瘟病、条纹叶枯病、纹枯病和白叶枯病，而且直链淀粉含量低，稻米食味品质优，适合于高档优质米开发。于2013年通过江苏省品种审定，适宜在江苏苏南地区种植。

A new japonica rice variety Nanjing 50 with good eating quality, high yield and multi-resistance was developed from Japanese variety Kantou 194 carrying low-amylose content gene Wx-mq and resistance gene Stv-bi as the male parent to cross with Chinese variety Wujing 13 in Jiangsu province, through the method of mixed pedigree combining with the technology of marker assisted selection. This variety had many high yield characteristics, such as proper height, vigorous growth, strong tillering ability and large spike. Its yield structure for 650 kg/667 m2 should meet these indicators that the number of effective panicles per hectare, grain number per panicle, seed setting rate and 1 000-grain weight were 200,000, 140~150, 90%~95% and 25 g respectively. Nanjing 50 had not only good resistance to most of disease including rice blast, stripe virus, sheath blight and bacterial blight, but also had excellent eating quality with low amylose content compared with that of ordinary rice varieties, and it was suitable for commercial development for high-grade quality rice. The variety was released to farmers by Jiangsu Provincial Crop Variety Release Committee in 2013 and could be cultivated in south of Jiangsu Province.