文献类型： 外文期刊
作者： Cai, Shibin 2 ; Bai, Gui-Hua 1 ; Zhang, Dadong 2 ;
作者机构： 1.USDA ARS, Plant Sci & Entomol Res Unit, Manhattan, KS 66506 USA
2.Kansas State Univ, Dept Agron, Manhattan, KS 66506 USA
3.Jiangsu Acad Agr Sci, Nanjing 210014, Peoples R China
期刊名称：THEORETICAL AND APPLIED GENETICS （ 影响因子：5.699； 五年影响因子：5.565 ）
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收录情况： SCI
摘要： Aluminum (Al) toxicity is a major constraint for wheat production in acid soils worldwide. Chinese land-race FSW demonstrates a high level of Al resistance. A population of recombinant inbred lines (RILs) was developed from a cross between FSW and anAl-sensitive Chinese line, ND35, using single seed descent, to map quantitative trait loci (QTLs) for Al resistance. Wheat reaction to Al stress was measured by net root growth (NRG) in a nutrient solution culture containing A13+ and hematoxylin stainingscore (HSS) of root after Al stress. After 1,437 simple sequence repeats (SSRs) were screened using bulk segregant analysis, three QTLs were identified to control Al resistance in FSW. One major QTL (Qalt.pser-4DL) was mapped on chromosome 4DL that co-segregated with Xups4, a marker for the promoter of the Al-activated malate transporter (ALMT1) gene. The other two QTLs (Qalt.pser-3BL, Qalt.pser-2A) were located on chromosomes 3BL and 2A, respectively. Together, the three QTLs accounted for up to 81.9%of the phenotypic variation for HSS and 78.3% of the variation for NRG. The physical positions of flanking markers for Qalt.pser-4DL and Qalt.pser-3BL were determined by analyzing these markers in corresponding nulli-tetrasomic, ditelosomic, and 3BL deletion lines of Chinese Spring. Qalt.pser-3BL is a novel QTL with a major effect on Al resistance discovered in this study. The two major QTLs on 4DL and 3BL demonstrated an additive effect. The SSR markers closely linked to the QTLs have potential to beused for marker-assisted selection (MAS) to improve Al resistance of wheat cultivars in breeding programs.
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