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<p>Potato common scab, primarily caused by the soil-borne pathogen <i>Streptomyces europaeiscabiei</i>, is a significant disease that leads to considerable yield and tuber-quality losses in many countries. The biocontrol potential of potato endophytic actinobacteria against the common scab pathogen was examined in in vitro, greenhouse, and field studies. <i>Streptomyces shenzhenensis</i> (E2) and <i>Streptomyces flavovirens</i> (R1) were the most effective antagonists in vitro among the 10 tested isolates, with inhibition zones of 72.39 mm and 63.85 mm, respectively. Greenhouse studies revealed that the application of the <i>S. shenzhenensis</i> powder formulation significantly reduced disease severity from 91.7% to 8.4%. It also improved plant growth parameters, such as shoot and tuber biomass. Field experiments confirmed the effectiveness of <i>S. shenzhenensis</i> treatment, resulting in 14.08% disease reduction and 2.98 kg tuber yield per plant. Biochemical assays showed increased contents of total phenolics (8.1 mg gallic acid g<sup>−1</sup>) and flavonoids (4.5 mg catechin g<sup>−1</sup>), suggesting activation of host defence-related biochemical responses in <i>S. shenzhenensis</i>-treated plants. In general, the results suggest that endophytic <i>Streptomyces</i> strains, including <i>S. shenzhenensis</i> (E2), should be effective biological control agents for potato common scab in sustainable agriculture and can compensate for chemical control methods.</p>

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Biological Control Application of Endophytic Streptomyces spp. against Potato Common Scab

  • 期刊论文

  • 发表日期：

    2026年3月19日

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  • Kamal A. M. Abo-Elyousr,
  • Najeeb M. Almasoudi,
  • Adel D. Al-Qurashi,
  • Hadeel M.M. Khalil Bagy,
  • Abdelaal H. A. Shehata,
  • Nashwa M. A. Sallam

摘要

Potato common scab, primarily caused by the soil-borne pathogen Streptomyces europaeiscabiei, is a significant disease that leads to considerable yield and tuber-quality losses in many countries. The biocontrol potential of potato endophytic actinobacteria against the common scab pathogen was examined in in vitro, greenhouse, and field studies. Streptomyces shenzhenensis (E2) and Streptomyces flavovirens (R1) were the most effective antagonists in vitro among the 10 tested isolates, with inhibition zones of 72.39 mm and 63.85 mm, respectively. Greenhouse studies revealed that the application of the S. shenzhenensis powder formulation significantly reduced disease severity from 91.7% to 8.4%. It also improved plant growth parameters, such as shoot and tuber biomass. Field experiments confirmed the effectiveness of S. shenzhenensis treatment, resulting in 14.08% disease reduction and 2.98 kg tuber yield per plant. Biochemical assays showed increased contents of total phenolics (8.1 mg gallic acid g−1) and flavonoids (4.5 mg catechin g−1), suggesting activation of host defence-related biochemical responses in S. shenzhenensis-treated plants. In general, the results suggest that endophytic Streptomyces strains, including S. shenzhenensis (E2), should be effective biological control agents for potato common scab in sustainable agriculture and can compensate for chemical control methods.