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首页> 外文期刊>Theoretical and Applied Genetics >Identification of novel genomic regions associated with resistance to Pyrenophora tritici-repentis races 1 and 5 in spring wheat landraces using association analysis
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Identification of novel genomic regions associated with resistance to Pyrenophora tritici-repentis races 1 and 5 in spring wheat landraces using association analysis

机译：使用关联分析鉴定与春小麦地方品种中抗小麦疫霉菌小种1和5有关的新基因组区域

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摘要

Tan spot, caused by Pyrenophora tritici-repentis, is a major foliar disease of wheat worldwide. Host plant resistance is the best strategy to manage this disease. Traditionally, bi-parental mapping populations have been used to identify and map quantitative trait loci (QTL) affecting tan spot resistance in wheat. The association mapping (AM) could be an alternative approach to identify QTL based on linkage disequilibrium (LD) within a diverse germplasm set. In this study, we assessed resistance to P. tritici-repentis races 1 and 5 in 567 spring wheat landraces from the USDA-ARS National Small Grains Collection (NSGC). Using 832 diversity array technology (DArT) markers, QTL for resistance to P. tritici-repentis races 1 and 5 were identified. A linear model with principal components suggests that at least seven and three DArT markers were significantly associated with resistance to P. tritici-repentis races 1 and 5, respectively. The DArT markers associated with resistance to race 1 were detected on chromosomes 1D, 2A, 2B, 2D, 4A, 5B, and 7D and explained 1.3–3.1% of the phenotypic variance, while markers associated with resistance to race 5 were distributed on 2D, 6A and 7D, and explained 2.2–5.9% of the phenotypic variance. Some of the genomic regions identified in this study correspond to previously identified loci responsible for resistance to P. tritici-repentis, offering validation for our AM approach. Other regions identified were novel and could possess genes useful for resistance breeding. Some DArT markers associated with resistance to race 1 also were localized in the same regions of wheat chromosomes where QTL for resistance to yellow rust, leaf rust and powdery mildew, have been mapped previously. This study demonstrates that AM can be a useful approach to identify and map novel genomic regions involved in resistance to P. tritici-repentis.
机译：由小麦黄斑病菌（Pyrenophora tritici-repentis）引起的棕褐色斑点是全世界小麦的主要叶面病。寄主植物抗性是控制该病的最佳策略。传统上，双亲测图种群已用于识别和定位影响小麦抗棕褐色斑点的数量性状基因座（QTL）。关联映射（AM）可能是基于多种种质集内的连锁不平衡（LD）识别QTL的替代方法。在这项研究中，我们评估了来自USDA-ARS国家小粒谷物保藏中心（NSGC）的567份春小麦地方品种对P. tritici-repentis小种1和5的抗性。使用832分集阵列技术（DArT）标记，鉴定了抗小黑麦草小种1和5的QTL。具有主要成分的线性模型表明，至少七个和三个DArT标记分别与抗小麦黑粉病小种1和5显着相关。在种族1D，2A，2B，2D，4A，5B和7D染色体上检测到与种族1抗性相关的DArT标记，并解释了1.3–3.1％的表型变异，而与种族5抗性相关的标记则分布在2D上。 ，6A和7D，并解释了表型变异的2.2–5.9％。在这项研究中鉴定出的某些基因组区域对应于先前鉴定出的负责抗小麦黑粉病的基因座，为我们的AM方法提供了验证。鉴定出的其他区域是新颖的，并可能具有可用于抗性育种的基因。一些与第1种抗性相关的DArT标记也位于小麦染色体的同一区域，在该区域中先前已绘制了对黄锈病，叶锈病和白粉病的抗性QTL。这项研究表明，AM可以是一种有用的方法，用于鉴定和绘制与小麦黑斑病菌抗性有关的新型基因组区域。

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  • 来源
    《Theoretical and Applied Genetics》 |2011年第6期|1029-1041|共13页
  • 作者

    S. Gurung; S. Mamidi; J. M. Bonman; E. W. Jackson; L. E. del Río; M. Acevedo; M. Mergoum; T. B. Adhikari;

  • 作者单位

    Department of Plant Pathology North Dakota State University NDSU Dept. 7660 P.O. Box 6050 Fargo ND 58108-6050 USA;

    Department of Plant Sciences North Dakota State University NDSU Dept. #7670 PO Box 6050 Fargo ND 58108-6050 USA;

    Small Grains and Potato Germplasm Research Unit USDA-ARS Aberdeen ID 83210 USA;

    Small Grains and Potato Germplasm Research Unit USDA-ARS Aberdeen ID 83210 USA;

    Department of Plant Pathology North Dakota State University NDSU Dept. 7660 P.O. Box 6050 Fargo ND 58108-6050 USA;

    Department of Plant Pathology North Dakota State University NDSU Dept. 7660 P.O. Box 6050 Fargo ND 58108-6050 USA;

    Department of Plant Sciences North Dakota State University NDSU Dept. #7670 PO Box 6050 Fargo ND 58108-6050 USA;

    Department of Plant Pathology North Dakota State University NDSU Dept. 7660 P.O. Box 6050 Fargo ND 58108-6050 USA;

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