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<p><i>Globodera pallida</i> is a major pest that is responsible for huge losses in potato yields worldwide<i>.</i> Expanding the gene pool of cultivated potatoes with clones resistant to this pest is made possible by searching for resistance genes in wild <i>Solanum</i> species<i>.</i> The aim of this study was to identify quantitative trait loci (QTLs) for potato resistance to <i>Globodera pallida</i> derived from <i>Solanum gourlayi</i>. A resistant diploid potato clone, Sg 2/7 (<i>Solanum gourlayi</i>, accession CGN17592), was crossed with a susceptible potato hybrid clone, DW 94-4235, to generate an F1 mapping population. All clones were tested for nematode resistance using <i>G. pallida</i>, pathotypes Pa2 and Pa3, in 2 or 3 years (2017–2019), respectively. Diversity Array Technology (DArTseq) was used for genotyping and genetic map construction. QTLs for nematode resistance were identified on potato chromosomes II, IV, V, VI, VII, X, XI,&#xa0;and XII, explaining from 10.1 to 21.5% of phenotypic variance. The most significant QTL for resistance to <i>G. pallida</i> pathotype Pa2 was identified on chromosome XII,&#xa0;explaining 20.9% of the phenotypic variance in the dataset from 2017. The most significant QTL for resistance to the <i>G. pallida</i> Pa3 pathotype was identified on chromosome VI, with a CAPS marker Exp928 in its peak,&#xa0;explaining 21.5% of the phenotypic variance in the dataset from 2017. The novel QTLs for resistance to <i>S. gourlayi</i> may be useful for breeding resistant potato cultivars, further studies of candidate genes,&#xa0;and host responses of potato to <i>G. pallida</i> infection.</p>

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Quantitative trait loci for Globodera pallida resistance derived from wild potato species Solanum gourlayi

  • 期刊论文

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  • 发表日期：

    2025年10月23日

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  • Dorota Milczarek,
  • Jadwiga Śliwka,
  • Beata Tatarowska,
  • Anna Podlewska-Przetakiewicz,
  • Jarosław Plich

摘要

Globodera pallida is a major pest that is responsible for huge losses in potato yields worldwide. Expanding the gene pool of cultivated potatoes with clones resistant to this pest is made possible by searching for resistance genes in wild Solanum species. The aim of this study was to identify quantitative trait loci (QTLs) for potato resistance to Globodera pallida derived from Solanum gourlayi. A resistant diploid potato clone, Sg 2/7 (Solanum gourlayi, accession CGN17592), was crossed with a susceptible potato hybrid clone, DW 94-4235, to generate an F1 mapping population. All clones were tested for nematode resistance using G. pallida, pathotypes Pa2 and Pa3, in 2 or 3 years (2017–2019), respectively. Diversity Array Technology (DArTseq) was used for genotyping and genetic map construction. QTLs for nematode resistance were identified on potato chromosomes II, IV, V, VI, VII, X, XI, and XII, explaining from 10.1 to 21.5% of phenotypic variance. The most significant QTL for resistance to G. pallida pathotype Pa2 was identified on chromosome XII, explaining 20.9% of the phenotypic variance in the dataset from 2017. The most significant QTL for resistance to the G. pallida Pa3 pathotype was identified on chromosome VI, with a CAPS marker Exp928 in its peak, explaining 21.5% of the phenotypic variance in the dataset from 2017. The novel QTLs for resistance to S. gourlayi may be useful for breeding resistant potato cultivars, further studies of candidate genes, and host responses of potato to G. pallida infection.