不同水分条件下玉米株高和穗位高的QTL分析

QTL Analysis of Plant Height and Ear Height in Maize under Different Water Regimes

干旱是影响玉米产量的重要因素。在干旱条件下,玉米株高和穗位高往往受到影响,因此是研究耐旱性的重要指标。本研究利用A188×91黄15的F2∶3家系,进行株高和穗位高的数量性状位点(QTL)分析。结果表明,在水分胁迫条件下,分别各有10个QTL与株高和穗位高有关;在水分充足条件下,则检测到各有6个QTL与株高和穗位高有关。各QTL解释的表型变异在7.3%～53.9%之间。位于第8染色体上的QTL个数占总QTL近50%,LOD值均大于4.6,推测该染色体存在控制玉米株高和穗位高QTL的重要区域。本研究在bnlg1812标记附近检测到在水分胁迫下同时控制株高和穗位高的QTL,解释的表型变异在20%以上,该QTL是值得进一步研究和利用的位点。

Drought is one of the most important factors influencing maize plant height and ear heig ear height were analyzed ditions ten and ten Q TL with cated lated plant ht are affected. In th using F2：3 families of associated with plant e present study, quantitative trai A188 × 91 Huang 15. The results showed that under drought conditions ten and ten QTL associated with plant height and ear height, respectively. Six and six QTL associated with plant height and ear height under normal conditions were detected, respectively. The number of QTL located on chromosome 8 accounted for nearly half of total QTL detected, with LOD more than 4.6. It was postulated that chromosome 8 carries important regions controlling plant height and ear height. QTL controlling both plant height and ear height under water stress was detected near bnlgl812, which could explain over 20% of phenotypic variation. This marker could be useful in marker-assisted selection.