Suwan系列玉米自交系与温带玉米自交系的配合力分析

Analysis of Combining Ability between Suwan Inbred Lines and Temperate Tester

选用具有Suwan血缘的25个自交系作为被测系,以温带自交系掖478、黄早4、MO17、丹340作测验种,采用不完全双列杂交法组配出F1杂交组合100个。采用完全随机区组设计,对11个性状进行配合力分析,并估算群体遗传参数。结果表明,Su2-6-5-1、Su2-2-2-2、Su124、Su137-3、Su102、SW93-2-2-2、SW98-1-2自交系在穗部性状和产量性状的一般配合力效应大部分表现为正值,其综合性状较好,利用它们作亲本,较容易组配出强优势组合。而Su119-1、Su127和Su5-8-2综合性状表现较差,需改良后方能利用。对于产量性状,特殊配合力表现为较大正效应值的组合有Su137-3×Mo17、Su112×掖478、SW93-2-2-2×丹340、SW40-3-4-2×黄早四、Su102×黄早四、Su127×Mo17,表明这些组合有显著的增产效应,有望成为苗头品种。

Materials used in this study consisting of 25 inbred lines developed from Suwan germplasm and 4 temperate inbred lines,Ye478,Huangzao4,Mo17 and Dan340 as testers.One hundred F1 crosses were developed by using method ofNC Ⅱ.In this study,combining abilities of 11 characters were analyzed and the genetic parameters were evaluated using randomized complete-block design.The results indicated that the general combining abilities for the seven inbred lines,Su2-6-5-1,Su2-2-2-2,Su124,Su137-3,Su100,SW93-2-2-2 and SW98-1-2,were positive for ear and yield,and better performance in most traits.These lines using as parental lines will be easier to develop good performance hybrids.Three inbred lines,Su119-1,Su12 and Su5-8-2,had poor traits performance,which need to be improved before utilization.Six crosses,Su137-3xMo17,Su112xYe478,SW93-2-2-2xDan340,SW40-3-4-2xHuangzao4,Su102xHuangzao4 and Su127xMo17,having greater positive special combining ability of yield,and potential to improve yield,will be promising crosses.