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<p>Fusarium wilt&#xa0;and&#xa0;Verticillium wilt (VW) diseases are two most destructive soil-borne fungal diseases and can only be managed most effectively through resistant cultivars. Genetic studies of resistance to the two diseases have been predominantly conducted based on foliar symptoms and there was no report on the genetic basis of the resistance based on vascular discoloration (VD) in cultivated diploid A genome cotton (<i>Gossypium arboreum</i>). In this study, we assessed root VD, stem VD, and disease incidence (DI) in 245 <i>G</i>. <i>arboreum</i> accession across repeated greenhouse tests to identify single nucleotide polymorphisms (SNPs) associated with the wilt resistance. Results showed that many diploid Asiatic accessions exhibited resistance to both wilt diseases, providing a valuable genetic resource for breeding cotton with host plant resistance. A genome-wide association study revealed 54 and 14 SNPs significantly associated with <i>Fusarium oxysporum</i>&#xa0;f. sp.&#xa0;<i>vasinfectum</i>&#xa0;race 4 and VW resistance, respectively. Notably, five SNPs exhibited pleiotropic effects, contributing to resistance against both pathogens in cotton with significantly lowering DI. Forty-three of these identified SNPs were novel, while others were previously reported in a different genetic background. Those findings highlight the importance of leveraging diploid species as a genetic resource and the subsequent introduction of these resistance alleles into elite tetraploid cotton breeding lines.</p>

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Genetic dissection of resistance to Fusarium wilt and Verticillium wilt based on vascular discoloration in diploid Asiatic cotton, Gossypium arboreum

  • 期刊论文

  • 发表日期：

    2025年7月25日

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  • Abdelraheem Abdelraheem,
  • Yi Zhu,
  • Chunda Feng,
  • Salliana Stetina,
  • Derek Whitelock,
  • Terry Wheeler,
  • Linghe Zeng,
  • Jinfa Zhang

摘要

Fusarium wilt and Verticillium wilt (VW) diseases are two most destructive soil-borne fungal diseases and can only be managed most effectively through resistant cultivars. Genetic studies of resistance to the two diseases have been predominantly conducted based on foliar symptoms and there was no report on the genetic basis of the resistance based on vascular discoloration (VD) in cultivated diploid A genome cotton (Gossypium arboreum). In this study, we assessed root VD, stem VD, and disease incidence (DI) in 245 G. arboreum accession across repeated greenhouse tests to identify single nucleotide polymorphisms (SNPs) associated with the wilt resistance. Results showed that many diploid Asiatic accessions exhibited resistance to both wilt diseases, providing a valuable genetic resource for breeding cotton with host plant resistance. A genome-wide association study revealed 54 and 14 SNPs significantly associated with Fusarium oxysporum f. sp. vasinfectum race 4 and VW resistance, respectively. Notably, five SNPs exhibited pleiotropic effects, contributing to resistance against both pathogens in cotton with significantly lowering DI. Forty-three of these identified SNPs were novel, while others were previously reported in a different genetic background. Those findings highlight the importance of leveraging diploid species as a genetic resource and the subsequent introduction of these resistance alleles into elite tetraploid cotton breeding lines.