欧洲玉米种质BRC选系主要农艺性状的配合力及杂种优势分析

Combining Ability of Main Agronomic Traits and Heterosis of European Maize Germplasm BRC

采用NCⅡ遗传交配设计,以分属于5个杂种优势群的自交系昌7-2、DH34、Mo17、郑58和丹988为测验种,与5个欧洲玉米种质BRC选系组配25个杂交组合,分析5个欧洲玉米种质BRC选系的主要农艺性状的配合力及杂种优势。结果表明,自交系BRC-1和BRC-5单株产量及相关性状一般配合力表现较好,在玉米育种中有较大的利用潜力;组合BRC-5×Mo17、BRC-6×DH34和BRC-1×丹988是产量及相关性状特殊配合力综合表现优良的组合;BRC-5×DH34、BRC-1×DH34、BRC-1×丹988、BRC-6×DH34和BRC-1×昌7-2是单株产量总配合力和杂种优势表现突出的组合。BRC种质选系或BRC改良自交系可与旅大红骨、塘四平头、PN78599类群的玉米自交系杂交组配出强优势玉米杂交种。

The main agronomic traits combining ability and heterosis of five inbred lines which selected from European germplasm BRC were analyzed by using NC Ⅱ genetic mating designs and using inbred lines of Chang7-2, DH34, Mo17, Zheng58 and Dan988, which belong to the five heterosis groups respectively, as the testing parents which were crossed with five inbred lines selected from European germplasm BRC to 25 hybrids. The results showed that inbred line BRC-1 and BRC-5,which had great utilization potential in maize breeding, high general combining ability of the single plant grain yield and related traits; BRC-5xMo17, BRC-6xDH34 and BRC-1 x Dan988 were the combinations which had high special combining ability of yield and good related traits; BRC-5 x DH34, BRC- 1 xDH34, BRC- 1 xDan988, BRC-6xDH34 and BRC- 1 xChang7-2 were the combinations which had high general combining ability of yield and prominent heterosis; The hybrids crossed by BRC selected inbred lines or their improved inbred lines and the inbred lines of Luda Red Cob, Tangsipingtou and the inbred lines of PN78599 group had high heterosis. Key words： Maize; European germplasm; Combining ability; Heterosis