QTL analysis of flowering related traits in maize under different water regimes

chinois. 干旱是影响玉米产量最重要的因素。对玉米抗旱相关性状数量性状位点（QTL）进行分析有助于阐明玉米抗旱的遗传机制，为高效的抗旱育种提供基础。利用玉米A188×91黄15的139个F2：3家系，在新疆和北京两年对不同水分条件下的开花相关性状（抽雄天数、吐丝天数、开花天数、开花吐丝间隔期ASI）进行了QTL分析。共检测到26个QTL与水分充足条件下的开花相关性状有关，LOD值在2．62～8．40，解释的表型变异范围为9．1％～43．2％，在第8染色体的bnlg1176标记区域检测到一个QTL控制抽雄、吐丝和开花时间。同时，检测到6个QTL与水分胁迫下的开花相关陛状有关，LOD值在2．6～5．6，解释的表型变异范同为9．5％～58．O％，也在bnlgll76标记区域检测到控制抽雄和吐丝的QTL，解释的表型变异分别为16．6％和20．5％。在第8染色体的bnlg1176标记区域共检测到不同年份不同水分条件下控制抽雄、吐丝、开花和ASI的8个QTL，效应值均较高，可以推断这个区域为控制开花性状的重要区域，其标记有辅助选择的应用价值。[著者文摘]

anglais. Drought is one of the most important factors influencing maize yield. QTL analysis for related traits under water stress will facilitate the understanding of genetic mechanisms of drought tolerance and provide the basis of marker-assisted selection. The present study conducted QTL analysis of flowering-related traits including days to tasseling, days to silking, days to anthesis and anthesis to silking interval （ASI） under different water regimes in Xinjiang and Beijing, using 139 F2：3 families of A188 x 91 Huang 15. Totally 26 QTL were found to be associated with the flowering-related traits under normal water conditions, with the range of LOD of 2.62 - 8.40 and the range of pheno- typic variance explained of 9.1% - 43.2%. A QTL located near the marker ＂bnlg1176＂ on chromosome 8 controlled days to tasseling, days to silking and days to anthesis. Meanwhile, six QTL were found to be associated with the flow- ering-related traits under drought stress, with the range of LOD of 2.6 - 5.6 and the range of phenotypic variance explained of 9.5% - 58.0%. A QTL also located near the marker ＂bnlg1176＂ on chromosome 8 controlled days to tasseling and days to silking, which could explain 16.6% and 20.5% of phenotypic variance. The genomic region near bnlg1176 on chromosome 8 is presumed to be an important region because eight QTL were found.