14份引进美国玉米自交系的配合力分析及应用评价

14 Introduced American Maize Inbred Lines: Combining Ability and Application Evaluation

为加快玉米育种机械化进程,筛选早熟、耐密、脱水快、宜机收玉米新种质至关重要,本研究以14份引进美国玉米自交系为材料,采用NCⅡ不完全双列杂交设计,对11个玉米主要性状的配合力及其群体遗传参数进行研究。结果表明:IRF315可提高组合的产量,IRF313-1、IRF313-2、B103等自交系能使组合株高穗位降低,PHG7、PHK76、PHW43、PHJ89、3IBI3、B103、PHJ40等自交系能使组合脱水速率加快,这些系可在生产上加以利用;IRF313-1×郑718、IRF315×郑58组合具有较强的杂种优势,有一定的增产潜力;在育种工作中,株高等4个性状宜进行早代选择,而穗粗等4个性状宜进行晚代选择。

To speed up the process of mechanization of maize breeding,it is important to screen out new germplasms of early-maturity,high density resistance,quick dehydration and suitability to mechanized harvest.14 introduced American maize inbred lines were tested with the design of NCⅡincomplete diallel cross method to study the combining ability and its genetic parameters of 11 characters.The results showed that IRF315 line could improve the production of the combinations,IRF313-1,IRF313-2 and B103 inbred lines could decrease the plant height and ear height of the combinations,inbred lines of PHG7,PHK76,PHW43,PHJ89,3 IBI3,B103 and PHJ40 could accelerate the dehydration rate of the combinations and could be used directly in production.IRF313-1×Zheng718 and IRF315×Zheng58 combination had strong hybrid vigor and potentiality of yield increase.In maize breeding,the 4 characters such as plant height should be selected in early generation and the 4 characters such as ear width should be selected in later generation.