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<p>Adult-plant resistance to yellow rust, caused by <i>Puccinia striiformis</i> f. sp. <i>tritici</i>, is a durable type of resistance in wheat (<i>Triticum aestivum</i> L.). To map the quantitative trait loci (QTLs) for adult-plant resistance, 145 (Heyne × Lakin)F<sub>6:7</sub> recombinant inbred lines (RILs) were evaluated for rust infection type (IT) and maximum rust severity (MRS) in multiple environments and genotyped using single-nucleotide polymorphisms (SNPs) derived from 9&#xa0;K SNP chips and simple sequence repeat markers. Four major QTLs on chromosome arms 2AS (<i>QYr.hwwgr-2AS</i>), 2AL (<i>QYr.hwwgr-2AL</i>), 2BL (<i>QYr.hwwgr-2BL</i>) and 3BS (<i>QYr.hwwgr-3BS</i>) were identified for adult-plant resistance in multiple environments with their resistance alleles all from Heyne, except for <i>QYr.hwwgr-3BS</i>. <i>QYr.hwwgr-2AS</i> and <i>QYr.hwwgr-2BL</i> were significant for both IT and MRS. <i>QYr.hwwgr-2AS</i> showed the largest effect, explaining 10.6–51.3% of the phenotypic variance for MRS in four environments and 31.0% phenotypic variance for low IT in one experiment. <i>QYr.hwwgr-2BL</i> might be a new QTL in a 0.7-cM interval and explained 7.5–22.1% of the phenotypic variance of IT and 10.3–19.0% of the phenotypic variance of MRS. <i>QYr.hwwgr-2AL</i> was mapped at a 3.4-cM interval and explained 4.2–10.7% of the phenotypic variance for IT. <i>QYr.hwwgr-3BS</i> was identified at a 0.7-cM interval, accounting for 5.5–13.6% of the phenotypic variance for IT. Stacking all four QTLs in a single RIL can achieve a low IT of 0–2, which is significantly lower than the resistant parent Heyne.</p>

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Mapping QTLs for adult-plant resistance to yellow rust in a hard winter wheat population Heyne × Lakin

  • 期刊论文

  • 发表日期：

    2025年7月27日

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  • Chunlian Li,
  • Xiao-Ting Xu,
  • Yibo Zhang,
  • Shengjie Liu,
  • Jianhui Wu,
  • Dejun Han,
  • Robert Bowden,
  • John Fellers,
  • Guihua Bai

摘要

Adult-plant resistance to yellow rust, caused by Puccinia striiformis f. sp. tritici, is a durable type of resistance in wheat (Triticum aestivum L.). To map the quantitative trait loci (QTLs) for adult-plant resistance, 145 (Heyne × Lakin)F6:7 recombinant inbred lines (RILs) were evaluated for rust infection type (IT) and maximum rust severity (MRS) in multiple environments and genotyped using single-nucleotide polymorphisms (SNPs) derived from 9 K SNP chips and simple sequence repeat markers. Four major QTLs on chromosome arms 2AS (QYr.hwwgr-2AS), 2AL (QYr.hwwgr-2AL), 2BL (QYr.hwwgr-2BL) and 3BS (QYr.hwwgr-3BS) were identified for adult-plant resistance in multiple environments with their resistance alleles all from Heyne, except for QYr.hwwgr-3BS. QYr.hwwgr-2AS and QYr.hwwgr-2BL were significant for both IT and MRS. QYr.hwwgr-2AS showed the largest effect, explaining 10.6–51.3% of the phenotypic variance for MRS in four environments and 31.0% phenotypic variance for low IT in one experiment. QYr.hwwgr-2BL might be a new QTL in a 0.7-cM interval and explained 7.5–22.1% of the phenotypic variance of IT and 10.3–19.0% of the phenotypic variance of MRS. QYr.hwwgr-2AL was mapped at a 3.4-cM interval and explained 4.2–10.7% of the phenotypic variance for IT. QYr.hwwgr-3BS was identified at a 0.7-cM interval, accounting for 5.5–13.6% of the phenotypic variance for IT. Stacking all four QTLs in a single RIL can achieve a low IT of 0–2, which is significantly lower than the resistant parent Heyne.