10个热带、温带玉米群体育种潜势分析

[目的]研究热带温带玉米群体产量性状的产量配合力、杂种优势和杂优模式。[方法]采用NCⅡ遗传交配设计,对10个热带(亚热带)、温带玉米群体的配合力及杂种优势进行评价。[结果]墨黄1号、新墨1号和墨白962及豫综5号、辽旅综和WBM-C4的一般配合力较高,在育种利用上有较优的利用潜势;墨白961×豫综5号、新墨1号×WBM-C4、墨白964×辽旅综、墨白962×EP7和墨黄1号×SUWAN-1的特殊配合力较高,具有潜在杂优模式;供试群体各组合群体平均优势在5.9%~39.6%、超亲优势在3.8%~21.6%。统计表明,亲本群体组合F1基因型值与其平均优势相关关系不密切(r=0.200 8),亲本群体间的遗传差异与群体平均优势呈极显著正相关(r=0.786 7**)。[结论]该研究对热带温带玉米群体的进一步改良和有效利用提供参考依据。

Breeding Potentiality on 10 Tropical and Temperate Maize Populations

[Objective] The research aimed to study the yield combining ability,heterosis and heterosis model of yield traits in tropical and temperate maize populations.[Method] The ombining ability and heterosis of 10 tropical(subtropical) and temperate maize populations were evaluated by using NCⅡgenetic mating design.[Result] Mohuang1,Xinmo1,Mobai 962,Yuzong 5,Liaolvzong and WBM-C4 had higher general combining ability,which had better utilization potential in the breeding and utilization.Such cross combinations as Mobai 961×Yuzong 5,Xinmo 1 × WBM-C4,Mobai 964 × Liaolvzong,Mobai 962 × EP7 and Mohuang 1×SUWAN-1 had higher special combining ability,which had potential heterosis models.The average heterosis of each combination population among the tested populations was 5.9%～39.6% and the transgressive heterosis was 3.8%～21.6%.The statistic results showed that the correlation between F1 genotypic value of parental population combinations and the average heterosis was not close(r=0.200 8) and the genetic difference among parental populations showed an extremely significantly positive correlation with the average heterosis of population(r=0.786 7).[Conclusion] The research provided reference basis for further improvement and effective utilization of tropical and temperate maize populations.