玉米自交系京724和郑58的产量配合力及杂种优势研究

Yield Combining Ability and Heterosis of Maize Inbred Lines Jing724 and Zheng58

以优良玉米自交系京724和郑58为试材,采用NCII遗传交配设计,以京92、京2416、昌7-2、黄早四、京24、Lx9801等14个黄改群自交系为测验种,杂交组配所得28个杂交组合,调查测定杂交组合和自交系的子粒产量,分析京724和郑58与黄改群自交系的产量配合力及杂交种的杂种优势特性。结果表明,自交系京724子粒产量的一般配合力效应值为7.03,极显著高于郑58;杂交组合京724/京92(京科968)子粒产量的特殊配合力相对效应值在全部组合中最高,达23.71。京724与系列黄改系组配组合的子粒产量均值显著高于郑58所配组合;京724与系列黄改系所配组合的超标优势均值显著高于郑58所配组合;京科968的杂种优势指数与郑单958相当。

Two elite inbred lines Jing724and Zheng58and other fourteen testers of Huanggai group were used to create 28hybrid combinations by NCII genetic designs in the study.The grain yield of these inbred lines and hy-brid combinations were all investigated,further the yield combining ability of Jing724and Zheng58and heterosis of each hybrid combinations were analyzed.The general combining ability of grain yield of Jing724and Zheng58were 7.03and -7.03,respectively,and the difference was significant.The special combining ability analysis showed that the combination of Jing724/Jing92(Jingke968)reached to 23.71,which was the highest among all the combinations, while that of Zheng58/Chang7-2(Zhengdan958)was lower,indicating that the yield potential and over-standard het-erosis of the hybrid combinations crossed by Jing724was higher than that of Zheng58.Because the yield of parents of Jingke968were higher than that of Zhengdan958,Jingke968had better yield than Zhengdan958although they had similar heterosis index.