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龙粳21号(原代号龙花99-454)是黑龙江省农业科学院水稻研究所以龙交91036-1为母本,以龙花95361/龙花91340的F1为父本,接种其三交F1代植株花药离体培养,后经多年系统培育选择育成。2007年9月24日农业部超级稻专家组在江川农场大面积种植地块现场验收,实收1.17亩,亩产达786kg,通过国家超级稻专家组的验收,并被认定为寒地优质超级稻新品种,2008年3月通过了黑龙江省农作物品种审定委员会审定。
Longjing 21 (formerly Longhua 99-454) was a hybrid of Longsheng 91036-1 and F1 of Longhua 95361 / Longhua 91340. Plant anther culture in vitro, after years of system selection breeding bred. On September 24, 2007, the super rice expert team of the Ministry of Agriculture accepted the site inspection on the large-scale planted plots in Jiangchuan Farm with a harvest of 1.17 mu and a yield of 786 kg per mu, which was checked and accepted by the National Super Rice Expert Group and was identified as " New rice varieties, in March 2008 adopted the crop varieties of Heilongjiang Province Examination Committee validation.