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Molecular mapping of the brace root traits in sorghum (Sorghum bicolor L. Moench)

文献类型： 外文期刊

作者： Li, Ronggai 1 ; Han, Yucui 1 ; Lv, Peng 1 ; Du, Ruiheng 1 ; Liu, Guoqing 1 ;

作者机构： 1.Hebei Acad Agr & Forestry Sci, Inst Millet Crops, Shijiazhuang 050031, Peoples R China

2.Univ Aberdeen, Sch Biol Sci, Aberdeen AB24 2TZ, Scotland

关键词： sorghum;brace roots;SSR;QTL mapping

期刊名称：BREEDING SCIENCE （ 影响因子：2.086； 五年影响因子：2.632 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： 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 F-2 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

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