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<p>Gray mold, also known as Botrytis fruit rot, caused by <i>Botrytis cinerea</i>, is a major postharvest fungal disease affecting strawberries worldwide. Synthetic fungicides are commonly used to control this disease. However, the growing public and environmental concern about pesticide residues in harvested fruit and vegetables has driven the search for environmentally friendly and non-chemical alternatives to manage postharvest diseases. In this research, the efficacy of <i>Bacillus subtilis</i> isolates RYPB1 and MYPB1, isolated from yoghurt (a fermented milk product), was evaluated under laboratory conditions as biocontrol agents against <i>B. cinerea</i>. Under scanning electron microscopy, these strains of bacteria resulted in morphological defects in <i>B. cinerea</i>’s hyphae and dramatically inhibited its growth in the dual culture experiment. Furthermore, the two-sealed-base-plates assay demonstrated that <i>B. cinerea</i>’s mycelial development was inhibited by the antifungal volatile compounds produced by these bacterial isolates. The severity of gray mold disease was considerably decreased when strawberry fruits were treated with these bacterial isolates using postharvest dipping. Among the two bacterial isolates, <i>B. subtilis</i> RYPB1 was highly effective, reducing gray mold severity by 88% compared to the infected control. These bacterial isolates show great potential as food-safe microbial biofungicide for controlling postharvest strawberry gray mold.</p>

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Bacillus subtilis isolates from yoghurt suppress gray mold disease caused by Botrytis cinerea on postharvest strawberry fruit

  • 期刊论文

  • 发表日期：

    2025年11月5日

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  • Sara Al-Hatmi,
  • Abdullah Mohammed Al-Sadi,
  • Fatma Said Al-Mashani,
  • Issa Hashil Al-Mahmooli,
  • Mohamed Abdullah Al-Kindi,
  • Rethinasamy Velazhahan

摘要

Gray mold, also known as Botrytis fruit rot, caused by Botrytis cinerea, is a major postharvest fungal disease affecting strawberries worldwide. Synthetic fungicides are commonly used to control this disease. However, the growing public and environmental concern about pesticide residues in harvested fruit and vegetables has driven the search for environmentally friendly and non-chemical alternatives to manage postharvest diseases. In this research, the efficacy of Bacillus subtilis isolates RYPB1 and MYPB1, isolated from yoghurt (a fermented milk product), was evaluated under laboratory conditions as biocontrol agents against B. cinerea. Under scanning electron microscopy, these strains of bacteria resulted in morphological defects in B. cinerea’s hyphae and dramatically inhibited its growth in the dual culture experiment. Furthermore, the two-sealed-base-plates assay demonstrated that B. cinerea’s mycelial development was inhibited by the antifungal volatile compounds produced by these bacterial isolates. The severity of gray mold disease was considerably decreased when strawberry fruits were treated with these bacterial isolates using postharvest dipping. Among the two bacterial isolates, B. subtilis RYPB1 was highly effective, reducing gray mold severity by 88% compared to the infected control. These bacterial isolates show great potential as food-safe microbial biofungicide for controlling postharvest strawberry gray mold.