Dissection of the genetic basis of heterosis in an elite maize hybrid by QTL mapping in an immortalized F(2) population

作者：Tang Jihua^*; Yan Jianbing; Ma Xiqing; Teng Wentao; Wu Weiren; Dai Jingrui; Dhillon Baldev S; Melchinger Albrecht E; Li Jiansheng

来源：Theoretical and Applied Genetics, 2010, 120(2): 333-340.

DOI：10.1007/s00122-009-1213-0

The genetic basis of heterosis for grain yield and its components was investigated at the single- and two-locus levels using molecular markers with an immortalized F(2) (IF(2)) population, which was developed by pair crosses among recombinant inbred lines (RILs) derived from the elite maize hybrid Yuyu22. Mid-parent heterosis of each cross in the IF(2) population was used to map heterotic quantitative trait loci. A total of 13 heterotic loci (HL) were detected. These included three HL for grain yield, seven for ear length, one for ear row number and two for 100-kernel weight. A total of 143 digenic interactions contributing to mid-parent heterosis were detected at the two-locus level involving all three types of interactions (additive x additive = AA, additive x dominance = AD or DA, dominance x dominance = DD). There were 25 digenic interactions for grain yield, 36 for ear length, 31 for ear row number and 51 for 100-kernel weight. Altogether, dominance effects of HL at the single-locus level as well as AA interactions played an important role in the genetic basis of heterosis for grain yield and its components in Yuyu22.

• 出版日期2010-1
• 单位中国农业大学; 浙江大学