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<p>An increase in olive tree diseases caused by wood-borne fungi like <i>Biscogniauxia mediterranea</i> has been reported to cause serious damage. Due to the importance of this plant in the Mediterranean countries, the search for sustainable measures to control this disease is necessary. The strain OEE1 of <i>Bacillus velezensis</i> was selected to evaluate its potential to control this fungus. The results showed a high antagonistic activity by dual-plate assays reaching 87% and producing microscopic mycelial alterations. The crude diffusible metabolites when incorporated in different amounts in PDA medium showed a total inhibition of the radial growth of <i>B. mediterranea</i> at a concentration of 75%. This concentration is considered fungicidal for this pathogen. In addition to growth inhibition, a complete obstruction of spore germination was also observed from 50% of the bacterial culture filtrate. An evaluation of the antagonistic potential was also conducted on 2-year-old olive trees (cv. Chemlali) using both preventive and curative treatments. After 30 days, the treatments significantly reduced the development of cankers and necrosis compared to the positive control inoculated with <i>B. mediterranea</i>, in which the bark cracked and detached, and necrosis extended up to 77 mm. This study provides valuable information to promote the use of <i>B. velezensis</i> OEE1 as a suitable biocontrol agent against charcoal canker in olive trees.</p>

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Antagonistic effect of diffusible metabolites produced by Bacillus velezensis OEE1 against Biscogniauxia mediterranea causing the charcoal canker on olive trees

  • 期刊论文

  • 发表日期：

    2025年8月15日

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  • Manel Cheffi,
  • Rahma Mallek,
  • Houda Gharsallah,
  • Asma Ben Amara,
  • Eetizez Karoui,
  • Yaakoub Gharbi,
  • Karim Ennouri,
  • Samira Krid,
  • Mohamed Ali Triki

摘要

An increase in olive tree diseases caused by wood-borne fungi like Biscogniauxia mediterranea has been reported to cause serious damage. Due to the importance of this plant in the Mediterranean countries, the search for sustainable measures to control this disease is necessary. The strain OEE1 of Bacillus velezensis was selected to evaluate its potential to control this fungus. The results showed a high antagonistic activity by dual-plate assays reaching 87% and producing microscopic mycelial alterations. The crude diffusible metabolites when incorporated in different amounts in PDA medium showed a total inhibition of the radial growth of B. mediterranea at a concentration of 75%. This concentration is considered fungicidal for this pathogen. In addition to growth inhibition, a complete obstruction of spore germination was also observed from 50% of the bacterial culture filtrate. An evaluation of the antagonistic potential was also conducted on 2-year-old olive trees (cv. Chemlali) using both preventive and curative treatments. After 30 days, the treatments significantly reduced the development of cankers and necrosis compared to the positive control inoculated with B. mediterranea, in which the bark cracked and detached, and necrosis extended up to 77 mm. This study provides valuable information to promote the use of B. velezensis OEE1 as a suitable biocontrol agent against charcoal canker in olive trees.