高赖氨酸玉米亲本间遗传距离与杂种优势和配合力的关系

本文以8个高赖氨酸玉米自交系以及这8个亲本的56个完全双列杂交组合为材料,考查产量、品质等14个性状,进行遗传距离分析.结果表明,赖氨酸产量、蛋白质产量、脂肪产量和籽粒产量这4种产量性状的遗传距离与超亲优势、超标优势和特殊配合力之间都不存在显著的相关关系.但有一种趋势,即杂种优势较大的组合大多有较大的遗传距离.亲本的平均遗传距离与一般配合力之间也不存在显著的相关关系.遗传距离分析结果还属于参考性的,在实际育种工作中,进行配合力的测定依然是必要的.

Relationships between Genetic Distance and Heterosis and Combining Ability of High Lysine Maize

Eight high lysine maize lines and fifty-six diallel crosses of the lines were used to analyse the genetic distance (D2)of parents. There were no significant relationships between the D2 and heterosis. D2 and specific combining ability in lysine--yield,protein-yield, fat-yield and kernel-yield (kg/ha). There was no relationship between the average genetic distance of a line and general combining ability, either. It was necessary to test the combining ability of lines in maize breeding.