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<p>Tomato production is under severe threat from bacterial wilt caused by <i>Ralstonia solanacearum</i>, a destructive soil-borne pathogen that leads to significant global yield losses. Due to the limitations of chemical control methods, sustainable alternatives like biological control are crucial. This study aimed to assess the effectiveness of the antagonistic bacterium <i>Bacillus amyloliquefaciens</i> in suppressing <i>R. solanacearum</i> and enhancing growth in tomato plants. A pot experiment was carried out using a randomized complete block design with three replications and four treatments: control, <i>B. amyloliquefaciens</i> alone, <i>R. solanacearum</i> alone, and a combined inoculation. Growth parameters and disease severity were evaluated. The results indicated that inoculation with <i>B. amyloliquefaciens</i> alone resulted in the highest shoot length (80&#xa0;cm), root length (45&#xa0;cm), and shoot fresh weight (37.67&#xa0;g). In contrast, plants treated with only the pathogen exhibited the weakest growth and the most severe disease symptoms. The combined treatment significantly decreased pathogen colony counts in root tissues and disease severity compared to the pathogen-only treatment, demonstrating effective biocontrol. These findings suggest that <i>B. amyloliquefaciens</i> not only boosts plant growth but also effectively suppresses <i>R. solanacearum</i>, potentially through mechanisms like antibiosis, competition, and induced systemic resistance. This study confirms the promising potential of <i>B. amyloliquefaciens</i> as a sustainable and efficient biocontrol agent for managing tomato bacterial wilt.</p>

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Biocontrol efficacy and growth-promoting potential of Bacillus amyloliquefaciens against tomato bacterial wilt

  • 期刊论文

  • 发表日期：

    2026年7月9日

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  • Parvin Dadmehr,
  • Rasool Rezaei,
  • Massoud Dehdari

摘要

Tomato production is under severe threat from bacterial wilt caused by Ralstonia solanacearum, a destructive soil-borne pathogen that leads to significant global yield losses. Due to the limitations of chemical control methods, sustainable alternatives like biological control are crucial. This study aimed to assess the effectiveness of the antagonistic bacterium Bacillus amyloliquefaciens in suppressing R. solanacearum and enhancing growth in tomato plants. A pot experiment was carried out using a randomized complete block design with three replications and four treatments: control, B. amyloliquefaciens alone, R. solanacearum alone, and a combined inoculation. Growth parameters and disease severity were evaluated. The results indicated that inoculation with B. amyloliquefaciens alone resulted in the highest shoot length (80 cm), root length (45 cm), and shoot fresh weight (37.67 g). In contrast, plants treated with only the pathogen exhibited the weakest growth and the most severe disease symptoms. The combined treatment significantly decreased pathogen colony counts in root tissues and disease severity compared to the pathogen-only treatment, demonstrating effective biocontrol. These findings suggest that B. amyloliquefaciens not only boosts plant growth but also effectively suppresses R. solanacearum, potentially through mechanisms like antibiosis, competition, and induced systemic resistance. This study confirms the promising potential of B. amyloliquefaciens as a sustainable and efficient biocontrol agent for managing tomato bacterial wilt.