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<p>Loquat canker, caused by <i>Pseudomonas syringae</i> pv. <i>eriobotryae</i>, is a bacterial disease that infects loquat (<i>Eriobotrya japonica</i>) and has been reported in several countries. Three pathotypes, A, B, and C, have been reported in Japan. The loquat cultivar ‘Champagne’ is resistant to the loquat canker group C and possesses a qualitative trait governed by a recessive homozygous <i>pse-c</i> gene located on Linkage Group 3 (LG3), and quantitative traits located at unidentified loci. In this study, we identified novel quantitative trait loci (QTL) regions for resistance to group C in this cultivar. A seedling population with ‘Tanaka’ (<i>Pse-c</i>/<i>Pse-c</i>) crossed with ‘Champagne’ (<i>pse-c</i>/<i>pse-c</i>) was tested. The genetic map of ‘Champagne’ includes a total of 876 SNP markers mapped across 17 LGs, covering a total distance of 1,364.7 cM and an average marker density of 1. 7&#xa0;cM/locus. In addition to minor potential QTLs, the major QTL for resistance to loquat canker group C was detected in the upper region of LG14, with the QTL contributing 12.6% to the disease index. The results of this study may open new possibilities for resistance breeding against this disease.</p>

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Identification of new resistance QTL regions in loquat cultivar ‘Champagne’ against Pseudomonas syringae pv. eriobotryae group C

  • 期刊论文

  • 发表日期：

    2025年4月10日

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  • Shogo Koga,
  • Ryusei Kawaguchi,
  • Tsunami Tanaka,
  • Shigeki Moriya,
  • Naofumi Hiehata,
  • Koji Kabashima,
  • Atushi J. Nagano,
  • Yukio Nagano,
  • Shinji Fukuda

摘要

Loquat canker, caused by Pseudomonas syringae pv. eriobotryae, is a bacterial disease that infects loquat (Eriobotrya japonica) and has been reported in several countries. Three pathotypes, A, B, and C, have been reported in Japan. The loquat cultivar ‘Champagne’ is resistant to the loquat canker group C and possesses a qualitative trait governed by a recessive homozygous pse-c gene located on Linkage Group 3 (LG3), and quantitative traits located at unidentified loci. In this study, we identified novel quantitative trait loci (QTL) regions for resistance to group C in this cultivar. A seedling population with ‘Tanaka’ (Pse-c/Pse-c) crossed with ‘Champagne’ (pse-c/pse-c) was tested. The genetic map of ‘Champagne’ includes a total of 876 SNP markers mapped across 17 LGs, covering a total distance of 1,364.7 cM and an average marker density of 1. 7 cM/locus. In addition to minor potential QTLs, the major QTL for resistance to loquat canker group C was detected in the upper region of LG14, with the QTL contributing 12.6% to the disease index. The results of this study may open new possibilities for resistance breeding against this disease.