【摘要】 玉米是世界范围内具有经济重要性的作物之一.株高和穗位高是玉米育种过程中需考虑的2个重要农艺性状,对玉米产量、抗倒伏性及株型等都有较大影响.为进一步明确玉米株高和穗位高的遗传机制,本研究以B73×Zheng58的含有165个株系的F3:4重组自交系群体为作图群体,利用覆盖玉米10条染色体189个SSR标记对株高和穗位高进行QTL定位分析.总共定位到5个株高QTL和6个穗位高QTL;这11个QTL分布在除2号和6号之外的其他8条染色体上.单个QTL表型变异贡献率的变幅为4.3%~14.2%.其中10个QTL与以前报道过的QTL的位置相近或重叠,而株高QTL(qPH04-01)是新发现的群体专一性的QTL,最靠近标记umc0371,表型变异贡献率为8.8%,是值得进一步研究和利用的位点.更多还原

【Abstract】 Maize(Zea mays L.)is among the crops with the greatest worldwide economic importance.Plant height(PH)and ear height(EH)are two very important traits which are considered necessary in maize breeding and are related to morphology,lodging,and yield.To explore the genetic mechanism of PH and EH,an F3:4recombinant inbred lines(RILs)population with 165 lines was generated from a cross between inbred line(Zheng58)and inbred line(B73).189 polymorphic simple sequence repeat(SSR)markers were used to map quantitative trait loci(QTLs)for PH and EH.A total of 11 QTLs(5 QTLs for PH and 6 QTLs for EH)detected were located on 8chromosomes except chromosome 2and 6.Single QTL explained from 4.3% to 14.2% of the phenotypic variance.Interestingly,the novel plant height QTL(qPH04-01)was specific to the population,which was detected near umc0371 and could explain 8.8% of phenotypic variation.It is worthy of further research and utilization.更多还原