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玉米自交系丹 340具有抗病、抗倒伏、配合力高、生育期适中等特点。它是旅大红骨类群的骨干自交系之一 ,也是选育自交系优良的种质资源。许多育种者对丹 340及姊妹系丹 360进行了大量的改良创新工作 ,选育出的优良衍生系有 1 6个 ,组配的杂交组合在生产上大面积应用的有 2 1个。代表品种有东单 7号、西玉 3号、铁单 1 2号、海单 2号、丹玉 2 6号、丹 2 1 43、掖单 2 0号等 ,这些品种截至 1 998年底累计推广面积为 41 8.2万hm2 ,创社会经济效益 2 3亿元 ,可见 ,丹 340衍生系在玉米生产上同样有着重要的地位
Maize inbred line Dan 340 has the characteristics of disease resistance, lodging resistance, high combining ability and moderate growth period. It is one of the backbone inbred lines of the Luda red bone group and is also an excellent germplasm resource of breeding inbred lines. Many breeders have done a lot of improvement and innovation work on Dan 340 and sister line Dan 360. There are 16 excellent derived lines bred and 21 hybrid combinations are used on a large area. The representative varieties include Dongdan 7, Xiyu 3, Tiedan 1 2, Haidan 2, Dan Yu 26, Dan 2 1 43, Yedan 2 0, etc. The total area of these varieties as of the end of 1998 41 412 000 hm2, creating a social and economic benefits of 2.3 billion yuan, showing that Dan 340 derivative system also has an important position in the production of corn