Institute of Millet Crops, Hebei Academy of Agricultural & Forestry Sciences , Shijiazhuang 050031 , China ; School of Biological Sciences, University of Aberdeen , Zoology Building, Tillydrone Avenue, Aberdeen AB24 2TZ , UK.
Institute of Millet Crops, Hebei Academy of Agricultural & Forestry Sciences , Shijiazhuang 050031 , China.
Breed Sci. 2014 Jun;64(2):193-8. doi: 10.1270/jsbbs.64.193. Epub 2014 Jun 1.
The presence and morphology of plant brace roots are important root architecture traits. Brace roots contribute significantly to effective anchorage and water and nutrient uptake during late growth and development, and more importantly, have a substantial influence on grain yield under soil flooding or water limited conditions. However, little is known about the genetic mechanisms that underlie brace root traits. In this study, quantitative trait loci (QTLs) for presence of brace roots from the sorghum landrace "Sansui" were mapped and associated molecular markers were identified. A linkage map was constructed with 109 assigned simple sequence repeat markers using a F2 mapping population derived from the cross Sansui/Jiliang 2. Two QTLs associated with presence of brace roots were localized on chromosomes 6 and 7. The major QTL on chromosome 7 between markers Dsenhsbm7 and Xcup 70 explained about 52.5% of the phenotypic variation, and the minor QTL on chromosome 6 was flanked by Xtxp127 and Xtxp6 and accounted for 7.0% of phenotypic variation. These results will provide information for the improvement of sorghum root architecture associated with brace roots.
植物支持根的存在和形态是重要的根系结构特征。支持根在后期生长和发育过程中对有效锚固和水分及养分吸收有重要贡献，更重要的是，在土壤淹水或水分有限条件下对籽粒产量有重大影响。然而，关于支撑根特征的遗传机制知之甚少。本研究对高粱地方品种“三穗”的支撑根存在进行了数量性状位点（QTL）作图，并鉴定了相关的分子标记。利用来自 Sansui/Jiliang 2 的 F2 作图群体，利用 109 个分配的简单序列重复标记构建了一个连锁图谱。在染色体 6 和 7 上定位到与支撑根存在相关的 2 个 QTL。位于标记 Dsenhsbm7 和 Xcup 70 之间的染色体 7 上的主 QTL 解释了约 52.5%的表型变异，染色体 6 上的次 QTL 由 Xtxp127 和 Xtxp6 侧翼，占表型变异的 7.0%。这些结果将为改良与支撑根相关的高粱根系结构提供信息。
