Mapping a major QTL for hairy leaf sheath introgressed from Aegilops tauschii and its association with enhanced grain yield in bread wheat
Mapping a major QTL for hairy leaf sheath introgressed from Aegilops tauschii and its association with enhanced grain yield in bread wheat
复制标题
绘制节节山羊草毛状叶鞘基因渗入的主要 QTL 及其与面包小麦籽粒产量提高的关系
DOI：
10.1007/s10681-015-1457-5
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发表时间：
2015
期刊：
影响因子：
1.9
通讯作者：
Jun Li
中科院分区：
文献类型：
--
作者：
Hongshen Wan;Jun Li
节节山羊草是六倍体小麦的二倍体 D 基因组祖先，已被用于通过创建合成六倍体小麦 (SHW) 作为小麦育种的桥接机制来改良现代普通小麦。大多数Ae。节节小麦的叶鞘上有毛，而六倍体普通小麦通常无毛。本研究在 SHW 衍生品种川麦 42 产生的两个重组自交系 (RIL) 群体的 4D 染色体长臂上检测到叶鞘毛羽 (LSH) 的主要 QTL。QTL 峰两侧为标记 Xbarc48 和 Xbarc1183/D_GB5Y7FA01AGCKH_224，并解释了以上 75% 的表型变异。 LSH的QTL等位基因由川麦42贡献，来源于AE。节节。在两个 RIL 群体中，产生毛状叶鞘的 QTL 等位基因与谷物产量、粒重和单穗粒重的增加呈显着正相关。此外，大多数川麦42衍生品种都继承了毛状叶鞘的特征。这些结果表明，川麦42中的毛状叶鞘基因可以作为高产育种中的形态选择标记应用于标记辅助选择（MAS）。
Aegilops tauschii, the diploid D genome progenitor of the hexaploid wheat, has been used to improve modern common wheat by creating synthetic hexaploid wheat (SHW) as a bridging mechanism for wheat breeding. MostAe. tauschiiaccessions have hairiness on the leaf sheath, whereas the hexaploid common wheat is usually glabrous. In this study a major QTL for leaf sheath hairiness (LSH) was detected on the long arm of chromosome 4D in two recombinant inbred line (RIL) populations produced from SHW-derived cultivar Chuanmai 42. The QTL peak was flanked by markersXbarc48andXbarc1183/D_GB5Y7FA01AGCKH_224, and explained more than 75 % of the phenotypic variation. The QTL allele for LSH was contributed by Chuanmai 42, and originated fromAe. tauschii. In both RIL populations the QTL allele producing hairy leaf sheath was significantly and positively associated with increased grain yield, grain weight and grain weight per spike. Moreover, most Chuanmai 42-derived cultivars have inherited the hairy leaf sheath character. These findings suggest that the hairy leaf sheath gene in Chuanmai 42 can be applied in marker-assisted selection (MAS) as a morphologically selectable marker in breeding for high yield.