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Poster

Session: Session 2 Presenting Authors at Posters (Odds)

P-045 - Fusarium dry rot control through host encoded broad spectrum resistance in potato

Wednesday, July 16, 2025
13:30 - 15:15  
Location: Confex Hall 3
Crop resistance genetics and genomics

    Presenting Author(s)

  • DM

    Daniel Monino-Lopez

    Plant Breeding, Wageningen University and Research
    Wageningen, Gelderland, Netherlands

    • Author(s)

  • SB

    Stijn Bonnecroij

    Wageningen University & Research
    Wageningen, Gelderland, Netherlands

  • AM

    Annelotte Muller

    Wageningen University & Research
    Wageningen, Gelderland, Netherlands

  • MB

    Marjan Bergervoet

    Wageningen University & Research
    Wageningen, Gelderland, Netherlands

  • Ed

    Ezra de Lange

    Wageningen University & Research
    Wageningen, Gelderland, Netherlands

  • Tv

    Theo van der Lee

    Wageningen University & Research
    Wageningen, Gelderland, Netherlands

  • JV

    Jack Vossen

    Wageningen University & Research
    Wageningen, Gelderland, Netherlands

Potato dry rot is a major threat to global potato production, causing postharvest losses of 6%–25%, with reports of up to 60%. It is caused by soil-borne Fusarium species, primarily F. sambucinum, F. culmorum, and F. solani. Control measures are limited, and fungicide-resistant strains, along with scarce resistant cultivars, further exacerbate the problem. To identify new resistance sources, we screened 300 wild Solanum genotypes using a stem inoculation assay. Twenty accessions from 15 Solanum species—including S. chacoense, S. tarijense, S. berthaultii, S. demissum, S. albicans, and S. microdontum—showed resistance to at least one Fusarium species (F. sambucinum or F. solani). To assess Fusarium-resistance spectrum, these accessions were inoculated with 11 Fusarium potato infecting isolates. Broad-spectrum resistance was identified in S. demissum, S. albicans, and S. chacoense. Tuber inoculation assays confirmed resistance to key Fusarium species. Resistant accessions were used to generate segregating populations for mapping resistance loci. While the underlying resistance mechanisms remain unknown, these findings highlight the potential of these resistance sources for breeding resistant potato varieties. This research advances understanding of Fusarium (a-)virulence and resistance mechanisms, guiding future breeding strategies for durable resistance.