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水稻细菌性条斑病抗性位点的全基因组关联分析

Genome-wide Association Analysis of Loci for Rice Bacterial Leaf Streak Resistance

  • 摘要: 水稻(Oryza sative)细菌性条斑病(简称“细条病”)是主要的水稻病害,迄今为止尚未定位得到细条病抗性的主效基因,因此,挖掘细条病抗性基因具有重大研究意义,同时为抗性育种提供新的基因资源。本研究通过全基因组关联分析方法对207份水稻品种的细条病抗性表型的调控位点进行鉴定,分别利用一般线性模型(general linear model, GLM)和混合线性模型(mixed linear model, MLM)方法进行关联分析。GLM模型分析得到7个细条病抗性表型关联位点,分布于2号、3号、8号、11号和12号染色体,MLM模型分析得到4个细条病抗性表型关联位点。所获得的这些关联位点中有2个与前人鉴定的位点共定位,5个为新的细条病抗性关联位点。我们在两种模型分析所获得的相同的抗性表型关联位点中鉴定得到28个候选基因。这些基因为水稻抗细条病抗性育种提供新的基因资源,也为细条病抗性分子机制研究奠定基础。

     

    Abstract: Rice(Oryza sativa) bacterial leaf streak is a major rice disease, but the main gene of resistance to bacterial leaf streak has not been located. Therefore, it is of great significance to explore the resistance genes of bacterial leaf streak and provide new gene resources for resistance breeding. In this study, 207 rice varieties were identified by genome-wide association analysis. The general linear model(GLM) and mixed linear model(MLM) were used for association analysis. Seven resistance phenotype associated loci were obtained by using GLM model analysis, which were distributed on chromosomes 2, 3, 8, 11 and 12. Four resistance associated loci were obtained by using MLM model analysis. Among these associated loci, 2 were co-localized with the previously identified loci, and 5 were novel bacterial leaf streak resistance associated loci. Further, we identified 28 candidate genes at the loci that were obtained in both models. These genes not only provide novel gene resources for breeding rice cultivars with bacterial leaf streak resistance, but also laid solid base for further studying the molecular mechanism of bacterial leaf streak resistance in rice.

     

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