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为了挖掘小麦穗长和穗宽性状相关QTL，并为人工合成小麦优异基因资源的开发利用奠定基础，以普通小麦品种西农389×人工合成小麦材料KU98的F_7∶8 RIL群体为试验材料，基于小麦55K SNP芯片对F_7∶8群体分型结果绘制的遗传连锁图谱及2018和2019年调查统计的F₇群体表型数据，对小麦穗长和穗宽性状进行了QTL定位分析。结果表明，在1A、2D、3A、5A和7B染色体上检测到10个与穗长性状相关的QTL，在2D、4D、5A、6A和7D 染色体上检测到10个与穗宽性状相关的QTL，其中与穗长相关的 qSL-2D.1和与穗宽相关的 qSW-4D.1、 qSW-5A.1在两年中均被检测到，标记区间分别为AX-111939856～AX-111497351、AX-169335104～AX-110618708、AX-108792246～AX-111048027。 qSW-5A.1连续两年均为主效QTL，且与 qSL-5A.2在同一标记区间，推测该位点具有一因多效的遗传效应或连锁遗传效应。

英文摘要:

Spike length and width are important spike traits of wheat,which are closely related to yield. In this study,the F_7∶8 RIL population constructed by crossing the synthetic wheat KU98 with the common wheat Xinong 389 was used for mapping. F₇ individuals were genotyped by wheat 55K SNP array and spike phenotypes were investigated and analyzed in 2018 and 2019. QTL mapping program was used to generate high-density linkage map and mapping analysis. Ten QTLs related to spike length were detected on chromosomes 1A,2D,3A,5A and 7B,and ten spike width-related QTLs were detected on chromosomes 2D,4D,5A,6A and 7D. Spike length-related locus qSL-2D.1 and spike width-related loci qSW-4D.1 and qSW-5A.1 were consistent in 2018 and 2019,whose location intervals were AX-111939856-AX-111497351,AX-169335104-AX-110618708 and AX-108792246-AX-111048027,respectively. The major QTL qSW-5A.1 was located in the same interval as qSL-5A.2 which is speculated as a multi-effect or interlocking genetic effect. This study laid a foundation for the exploration of QTLs related to spike length and width and for the excellent gene resources of synthetic wheat.

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