1　丹340的选育玉米自交系丹340是周宝林1979年通过栽培玉米白轴旅9与有稃玉米杂交,Ｓ1代经Ｃｏ60γ射线辐射处理后,通过多代自交选育而成的一个优良玉米自交系。丹340自交系生长健壮,株高适中,株型清秀,配合力高,抗多种玉米病害,抗倒伏,适用性广,属中晚熟自交系。2　丹340应用 1 Dan 340 Breeding corn inbred line Dan 340 is Zhou Baolin in 1979 by cultivating corn Shixian Brocade 9 hybrid with corn, S1 generation by Co60γ-ray radiation treatment, through a multi-generation self-breeding Excellent maize inbred lines. Dan 340 inbred lines grow robust, moderate plant height, clear plant type, with high combining ability, resistance to a variety of maize diseases, lodging resistance, wide applicability, is a late-maturing inbred line. 2 Dan 340 applications