To identify stable quantitative trait loci (QTLs) responsible for sheath blight resistance, a recombinant inbred line mapping population consisting of 219 lines was developed by crossing Lemont and Yangdao 4. Average disease rating, average lesion length, maximum disease rating and maximum lesion length were assayed in six different environments. A total of 128 minor effect QTLs were detected by multiple interval mapping. These QTLs explained less than 11.2% of the phenotypic variations individually, and 106 QTLs were clustered in 20 QTL-rich regions/putative loci. Significant QTL × environment interactions were detected at three putative loci (qSBR11.1, qSBR11.2 and qSBR11.3), indicating that these three loci were not stable. The other 17 stable loci (qSBR1.1, qSBR1.2, qSBR2.1, qSBR2.3, qSBR3.1, qSBR3.2, qSBR3.5, qSBR3.6, qSBR5.1, qSBR7.1, qSBR8.1, qSBR9.1, qSBR9.2, qSBR9.3, qSBR12.1, qSBR12.2 and qSBR12.4) provided a foundation for marker-assisted selection in breeding. Analysis of allelic effect on the 20 putative loci identified 7 highly stable loci, including qSBR3.2, qSBR7.1, qSBR8.1, qSBR9.2, qSBR9.3, qSBR12.1 and qSBR12.2.

为了鉴定引起鞘枯病抗性的稳定的数量性状基因座（QTL），通过将Lemont和Yangdao 4杂交，开发了由219个品系组成的重组自交系作图群体。平均疾病等级，平均病变长度，最大疾病等级和最大病变长度为在六个不同的环境中进行分析。通过多个间隔映射检测到总共128个次要效果QTL。这些QTL单独解释了不到11.2％的表型变异，并且106个QTL聚集在20个QTL丰富的区域/假定位点中。在三个推定的基因座（qSBR11.1，qSBR11.2和qSBR11.3）上检测到显着的QTL×环境相互作用，表明这三个基因座不稳定。其他17个稳定基因座（qSBR1.1，qSBR1.2，qSBR2.1，qSBR2.3，qSBR3.1，qSBR3.2，qSBR3.5，qSBR3.6，qSBR5.1，qSBR7.1，qSBR8.1，qSBR9.1，qSBR9如图2所示，qSBR9.3，qSBR12.1，qSBR12.2和qSBR12.4）为育种中标记辅助选择提供了基础。等位基因对20个推定基因座的影响分析确定了7个高度稳定的基因座，包括qSBR3.2，qSBR7.1和qSBR8.1，qSBR9.2，qSBR9.3，qSBR12.1和qSBR12.2。