极早熟高产玉米杂交种的选育途径和方法

An Approach to Develop Extremly Early-Ripening High-Yield Maize Hybrids

本文利用河北省超早熟、抗寒冷珍贵玉米种质资源坝上火玉米,采用超早熟农家种×晚熟单交种顶交选育途径和改造农家种的方法,成功地将晚熟材料的高配合力、优良农艺性状导入超早熟、抗寒冷的农家品种遗传背景中去,选育出具三亲优良性状于一身的极早熟自交系,进而组配出极早熟高产玉米杂交种。

By means of topcross of extremly early-ripening native variety × later-maturing single cross variety, the high combining ability and excellent agronomic character of the latter were successfully introduced into the genetic bockground of the former with extremly early-rip-ening and strong cold resistance. As a result, an extremly early-ripening inbred line imtegrated all the desired traits of its three parental generations was screened out and one extremly early-ripening, high yield maize hybrid which has been broadly planted in North China for 7 year was derived.