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首页> 外文期刊>Genome >A novel QTL for Septoria speckled leaf blotch resistance in barley (Hordeum vulgare L.) accession PI 643302 by whole-genome QTL mapping
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A novel QTL for Septoria speckled leaf blotch resistance in barley (Hordeum vulgare L.) accession PI 643302 by whole-genome QTL mapping

机译：通过全基因组QTL定位对大麦（PI）643302大麦（Sortoria vulgare L.]

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摘要

Septoria speckled leaf blotch (SSLB), caused by Septoria passerinii, is one of the most important foliar diseases of barley (Hordeum vulgare L.) in North America. The primary problem caused by this disease is substantial yield loss. The objective of this study was to determine the chromosomal location of SSLB resistance genes in the barley accession PI 643302. A recombinant inbred line population was developed from the cross Zhenongda 7/PI 643302. PI 643302 is resistant while Zhenongda 7 is susceptible to SSLB. The population was phenotyped for SSLB resistance in five experiments in the greenhouse. A linkage map comprising 113 molecular markers was constructed and simplified composite interval mapping was performed. Two QTLs, designated QrSp-1H and QrSP-2H, were found. QrSp-1H was found on the short arm of chromosome 1H (1HS) in all five experiments and showed a large effect against SSLB. Based on the location of QrSp-1H, it is likely the SSLB resistance gene Rsp2. The QTL QrSp-2H mapped to the distal region on the long arm of chromosome 2H (2HL), had a smaller effect than QrSp-1H, and was also detected consistently in all five experiments. A QTL for SSLB resistance in the same region on chromosome 2H has not been reported previously in either cultivated or wild barley; thus, QrSp-2H is a new QTL for SSLB resistance in barley.
机译：雀斑雀斑引起的黑斑斑点斑斑病（SSLB）是北美大麦（Hordeum vulgare L.）最重要的叶面疾病之一。由该疾病引起的主要问题是大量的产量损失。本研究的目的是确定大麦登录号PI 643302中SSLB抗性基因的染色体位置。从杂交的Zhenongda 7 / PI 643302开发了一个重组自交系种群。PI643302具有抗性，而Zhenongda 7对SSLB敏感。在温室中的五个实验中，对种群的SSLB抗性进行了表型分析。构建了包含113个分子标记的连锁图谱，并进行了简化的复合区间作图。找到了两个QTL，分别称为QrSp-1H和QrSP-2H。在所有五个实验中，QrSp-1H均位于1H染色体（1HS）的短臂上，并显示出对SSLB的巨大作用。根据QrSp-1H的位置，可能是SSLB抗性基因Rsp2。定位于2H染色体长臂（2HL）远端区域的QTL QrSp-2H的作用小于QrSp-1H，并且在所有五个实验中均被一致检测到。以前在栽培大麦或野生大麦中均未报道2H染色体同一区域中SSLB抗性的QTL。因此，QrSp-2H是抗大麦SSLB的新QTL。

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