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Identification of Functional Genetic Variations Underlying Drought Tolerance in Maize Using SNP Markers

文献类型： 外文期刊

作者： Hao, Zhuanfang 1 ; Li, Xinhai 1 ; Xie, Chuanxiao 1 ; Weng, Jianfeng 1 ; Li, Mingshun 1 ; Zhang, Degui 1 ; Liang, Xiaol 1 ;

作者机构： 1.Chinese Acad Agr Sci, Inst Crop Sci, Natl Key Facil Crop Genet Resources & Improvement, Beijing 100081, Peoples R China

2.Chinese Acad Agr Sci, Inst Crop Sci, Natl Key Facil Crop

关键词： association analysis;drought tolerance;functional variation;maize (Zea mays L.);single nucleotide polymorphism

期刊名称：JOURNAL OF INTEGRATIVE PLANT BIOLOGY （ 影响因子：7.061； 五年影响因子：6.002 ）

ISSN： 1672-9072

年卷期： 2011 年 53 卷 8 期

页码：

收录情况： SCI

摘要： Single nucleotide polymorphism (SNP) is a common form of genetic variation and popularly exists in maize genome. An Illumina GoldenGate assay with 1 536 SNP markers was used to genotype maize inbred lines and identified the functional genetic variations underlying drought tolerance by association analysis. Across 80 lines, 1 006 polymorphic SNPs (65.5% of the total) in the assay with good call quality were used to estimate the pattern of genetic diversity, population structure, and familial relatedness. The analysis showed the best number of fixed subgroups was six, which was consistent with their original sources and results using only simple sequence repeat markers. Pairwise linkage disequilibrium (LD) and association mapping with phenotypic traits investigated under water-stressed and well-watered regimes showed rapid LD decline within 100-500 kb along the physical distance of each chromosome, and that 29 SNPs were associated with at least two phenotypic traits in one or more environments, which were related to drought-tolerant or drought-responsive genes. These drought-tolerant SNPs could be converted into functional markers and then used for maize improvement by marker-assisted selection.

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