QTL Mapping For Plant Height And Ear Height And QTL Interaction Network Using Z3HBILs Population Of Maize(Zea Mays L.)

Single Segment Introgression Lines(SSILs)was a permanent mapping population, which was developed using advance-backcross and marker-assisted selection, which is a novel materials for quantitative trait locus (QTL)genetic analysis. Comparing with the traditional population, there were more advantages in SSILs, such as knowable genetic background and steady genetic base; the accuracy and sensitivity of QTL mapped and identified were improved; genetic effects of QTL can be exactly analyzed and study on the interaction of QTL and environment or QTL were go along using SSILs.A population containing 98 near iso-genic introgression lines (Z3HBILs) with Zong3 genetic background and a testcross population developed by crossing those introgression lines with Zong3 were employed to identify QTL for plant height and ear height of maize. The phenotypic data collected from two years.1. A total of 9 QTL for plant height located on chromosome 1, 2, 3, 5and 6 were respectively detected using improved composite interval mapping (Ici-Mapping) with explaining phenotypic variation ranging from 3.09% to 22.55%, and 14 QTL for ear height located on chromosome 1, 2, 3, 4, 5, 6 and 8 were detected with explaining phenotypic variation ranging from 4.98% to 19.77%. These QTL actions mainly performed non-additive effect.2. In addition, 18 pairs of QTL interactions for plant height were detected and per se pair interaction explained phenotypic variation ranging from 4.231% to 31.988%, 13 pairs of interactions for ear height were detected and per se pair explained phenotypic variation ranging from 4.813%~31.028%. Most QTL interactions did not show the additive×additive interaction. Overall, we suggested that non-additive effect is potentially main genetic component for plant height and ear height of maize.3. Base on relationship of interacting QTL, a visual QTL interaction network was constructed, and 3 QTL flanking with bnlg1083,bnlg1811 and umc1018 which are at knob of the network were revealed. The three QTL might play important role on forming of plant height and ear height.