Abstract: In order to understand the breeding  situation and  trend of the latematurity medium  japonica  rice varieties in Jiangsu Province, the regional trial data and yield and quality of fortyfive latematurity medium japonica rice varieties released  in last thirty years were analyzed, which would provide a reference frame for the improvement and breeding of new varieties. The regional trial data showed that there were three development phases of yield of the latematurity medium japonica rice varieties and the representative varieties were Yanjing 2 with yield of over 500 kg/667m2 bred in 1983, Wuyujing 3 with yield of over 580 kg/667m2 bred in 1992, Wuyunjing 8 with yield of over 650 kg/667m2 bred in 1999, respectively. Yield of varieties bred after 2005 was fluctuated around 600 kg/667m2. Yield and quality of fortyfive latematurity medium  japonica rice varieties identified at Yangzhou in 2012 showed that  1) yield of varieties bred in different periods was all fluctuated from 500 kg/667m2 to 600 kg/667m2 and had not been developed significantly,  2) chalky grains of varieties had been improved significantly, but chalkiness and taste quality of varieties were still needed to be improved.

Key words: rice, latematurity medium japonica rice, yield, quality

摘要： 通过对近30年来江苏省育成的45个迟熟中粳品种的区域试验资料分析和种植鉴定，了解江苏迟熟中粳品种的育种状况，为新品种选育提供参考依据。区试资料分析表明，江苏近30年来迟熟中粳品种产量连上3个台阶，代表品种为1983年审定的盐粳2号，产量达到500 kg/667m2；1992年审定的武育粳3号，产量达到580 kg/667m2；1999年审定的武运粳8号，产量达到650 kg/667m2。2005年以后育成的品种产量徘徊在600 kg/667m2。2012年扬州种植鉴定结果表明，不同时期育成的品种产量为500~600 kg/667m2，产量提升不明显。近年来注重品种的外观品质改良，垩白粒率有明显改进，但垩白度和食味品质的改良仍需要加强。

关键词: 水稻, 迟熟中粳, 产量, 品质