12个泰国玉米群体的产量配合力效应分析及其杂种优势类群的划分

Combining Abilities of 12 Tai Corn Populations and Their Heterotic Grouping

对12个泰国玉米群体的配合力效应进行分析,并对其杂种优势类群进行划分。结果表明,12个泰国玉米群体的产量一般配合力(GCA)和特殊配合力(SCA)方差均存在极显著或显著差异,产量配合力总效应顺序与组合产量排序相吻合,两者成显著正相关。12个泰国玉米群体可分为2个杂种优势群,第Ⅰ类群包括Q9、Q11群体,与旅大红骨杂优群内的丹340等的SCA最高;第Ⅱ类群包括Q1等其余群体,与Reid杂优群内的掖478、7239等的SCA较高。第Ⅱ类群可分为3个亚群,第Ⅰ亚群包括Q1、Q2、Q10群体,与Reid杂优群内的掖478S CA最高;第Ⅱ亚群包括Q3、Q4、Q6、Q8、Q12群体,与塘四平头杂优群内的黄早四SCA最高;第Ⅲ亚群包括Q5、Q7群体,与Reid杂优群内的7239 SCA最高。产量排前10位的组合中以Q1、Q10、Q11为亲本的组合各2个,以Q2、Q5、Q7、Q8为亲本的组合各1个。群体Q1、Q10、Q11在广西的育种利用价值最高,可直接用于选育自交系或作为改良材料。

The effect of 12 Thai corn populations on combining abilities was analyzed and their heterotic groups were clarified in order to lay the scientific base for their utilization in breeding in Guangxi. The results revealed that the differences among 12 Thai corn populations were most significant or significant for variance of GCA and SCA for yield. The correlation between the total combining ability and the performance of the combinations for yield were positively significant. Twelve Tai corn populations were classified into two heterotic groups, and group I has the populations Q9 and Qll, which show higher SCA with such inbred line like Dan340 belonged to Lu-da-hon-gu heterotic group. Group II include Q1 and the left populations, which have higher SCA with such inbred line like Ye 478,7239 confined to Reid heterotic group. The group II could be further divided into three heterotic sub-groups. Sub-group I include Q1, Q2 and Q10, which has the highest SCA with Ye 478; Sub-group 1] contains Q3, Q4, Q6, Q8 and Q12, which show the highest SCA with Huangzaosi clarified to Sipintou heterotic group; Sub-group HI include Q5 and Q7, which express the highest SCA with 7239. Among the 72 combinations with the average yield performance ranked between first to tenth in order, two combinations are from each population Q1, QlO and Qll used as parent respectively, one combination is from each population Q2, Q5, Q7 and QS. Populations Q1, QlO and Qll have the highest breeding value in Guangxi, which can be suitable for direct use as source populations for line development or for improvement for other elite maize materials.