中文摘要：

小麦穗部性状与单株产量密切相关。本研究以小麦骨干亲本燕大1817与优良品系北农6号衍生的269个重组自交系为材料,通过在北京和河北石家庄的2年田间试验数据,利用本实验室已构建的高密度SNP和SSR遗传连锁图谱进行穗长、穗粒数和穗粒重 QTL定位。采用完备复合区间作图法共检测到29个穗部性状加性效应 QTL,其中10个穗长QTL分布于1B、2D、3A、3B、4A、5A、5B、6A和7D染色体上,解释的表型变异率为2.96%~9.63%, QSl.cau-4A.2在所有5个环境中均能被检测到,解释的表型变异为5.89%~9.62%,另有7个QTL能在2个或2个以上环境中被检测到；8个穗粒数相关QTL分布于1A、3A、3D、4A和5B染色体上,解释的表型变异为4.06%~11.17%,为单个环境QTL。11个与穗粒重相关QTL分布于1A、1B、2A、2D、3A、4D、5A、5B和6B染色体上,解释的表型变异为2.79%~16.12%,其中QGws.cau-1B、QGws.cau-3A和QGws.cau-6B.2在2个或者2个以上环境中能被检测到。另外,鉴定出6个分布于1A、2D、3A、4A和5B染色体上的QTL富集区段。

英文摘要：

Spike length （SL）, grain number per spike （GNS）, and grain weight per spike （GWS） are important spike traits associ-ated with yield in wheat. In this study, quantitative trait loci （QTLs） for spike traits were mapped using an available high-density SNP and SSR genetic linkage map developed from a recombinant inbred line （RIL） population of Yanda 1817 × Beinong 6. Using phenotypic data on two locations （Beijing and Shijiazhuang） in two years （2011–2012 and 2012–2013 growing seasons）, 29 QTLs for SL, GNS and GWS were detected by inclusive composite interval mapping （ICIM） （LOD≥ 2.5）. Among which, 10 QTLs for spike length were mapped on chromosomes 1B, 2D, 3A, 3B, 4A, 5A, 5B, 6A, and 7D with phenotypic variations ranging from 2.96% to 9.63%. A stable and major QTL associated with SL, QSl.cau-4A.2, was detected in all the environments with phenotypic variations ranging from 5.89% to 9.62%. Eight QTLs for GNS were found on chromosomes 1A, 3A, 3D, 4A, and 5B with pheno-typic variations from 4.06% to 11.17%. However, they were all environments sensitive and detected in a single environment. Eleven QTLs for GWS were mapped on chromosomes 1A, 1B, 2A, 2D, 3A, 4D, 5A, 5B, and 6B with phenotypic variations rang-ing from 2.79% to 16.12%. The QTLQGws.cau-6B.2was identified in three environments and the favorable allele was contrib-uted by Beinong 6. The stable QTLs on chromosomes 3A, 4A, 6B, and 7D identified in this study may serve as target sites in marker-assisted selection of spike related traits in wheat breeding program.