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<p>Mycelium-infected seeds serve as the primary vehicle for long-distance dissemination of <i>Sclerotinia sclerotiorum</i>, enabling this fungus to establish in previously unaffected agricultural regions. We hypothesized that common bean genotypes with partial resistance to white mold (WM) would show lower seed infection rates by <i>S</i>. <i>sclerotiorum</i> compared to susceptible genotypes. To test this, seeds from 12 genotypes were collected from two irrigated trials exposed to either moderate or high WM pressure and evaluated using the Neon test. The genotypes were categorized into four groups (G) of three genotypes each: G1 (Type III, field-susceptible), G2 (Type I, field-resistance and physiological resistance assessed by straw test), G3 (Type II, field-resistance), and G4 (Type III, intermediately field-resistance). We found that seed infection frequency by <i>S</i>. <i>sclerotiorum</i> in G1 was 5.1-fold higher than in G3 (<i>p</i> &lt; 0.001), 3.0-fold higher than in G2 (<i>p</i> &lt; 0.001), and 1.4-fold higher than in G4 (<i>p</i> = 0.334). These outcomes highlight the potential of WM-resistant genotypes to substantially reduce the seed transmission of <i>S</i>. <i>sclerotiorum</i>, reinforcing the value of integrating resistant cultivars into WM management strategies.</p>

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Seed infection rates by Sclerotinia sclerotiorum differ between susceptible and partially resistant common bean genotypes

  • 期刊论文

  • 发表日期：

    2025年7月14日

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  • Rogério F. Vieira,
  • Pablo H. Teixeira,
  • Renan C. Lima,
  • Hudson Teixeira,
  • Trazilbo J. de Paula Jr.,
  • Heder Braun,
  • Vanessa A. P. Batista

摘要

Mycelium-infected seeds serve as the primary vehicle for long-distance dissemination of Sclerotinia sclerotiorum, enabling this fungus to establish in previously unaffected agricultural regions. We hypothesized that common bean genotypes with partial resistance to white mold (WM) would show lower seed infection rates by S. sclerotiorum compared to susceptible genotypes. To test this, seeds from 12 genotypes were collected from two irrigated trials exposed to either moderate or high WM pressure and evaluated using the Neon test. The genotypes were categorized into four groups (G) of three genotypes each: G1 (Type III, field-susceptible), G2 (Type I, field-resistance and physiological resistance assessed by straw test), G3 (Type II, field-resistance), and G4 (Type III, intermediately field-resistance). We found that seed infection frequency by S. sclerotiorum in G1 was 5.1-fold higher than in G3 (p < 0.001), 3.0-fold higher than in G2 (p < 0.001), and 1.4-fold higher than in G4 (p = 0.334). These outcomes highlight the potential of WM-resistant genotypes to substantially reduce the seed transmission of S. sclerotiorum, reinforcing the value of integrating resistant cultivars into WM management strategies.