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<p>Current agricultural production relies heavily on synthetic pesticides, which can damage human beings and the environment. To maintain the availability of food for the world's rapidly expanding population, more environmentally friendly alternatives to chemical pesticides need to be developed. Microalgae contain several antimicrobial chemicals and are regarded as one of the most promising alternative sources of innovative biopesticides. In this work, <i>Ulothrix subtilissima rabenhorst</i> and <i>Mastigocladus laminosus cohn ex kirchner</i>, isolated from Egyptian soil, were utilized to fight <i>Rhizoctonia solani</i> (<i>R. solani</i>) root rot disease and stimulate Pepper's defense mechanisms and growth promotion tactics. The chemical components of the methanolic extract of <i>Ulothrix</i> and <i>Mastigocladus</i> were analyzed by GC–MS and contained several active compounds that exhibited variable efficiency against the pathogen in vitro. The filtrates of <i>Ulothrix</i> and <i>Mastigocladus</i> separately effectively reduced the severity of <i>Rhizoctonia</i> root rot disease by 40% and 17.5%, respectively. Additionally, these treatments increased plant defense responses by 52% and 79%, respectively, compared to the untreated infected plants. The use of microalgal extracts produced varying responses in terms of photosynthetic pigments, total carbohydrate content, and total protein of <i>Rhizoctonia</i>-infected plants. Accordingly, this work presents a promising insight into algal extracts that could effectively limit <i>Rhizoctonia</i> root rot disease and can be used as a natural product against&#xa0;<i>R. solani</i> infection.</p>

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Enhancing pepper (Capsicum annuum L.) defense against rhizoctonia root rot with Ulothrix subtilissima and Mastigocladus laminosus extracts"

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年6月10日

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  • Walaa M. Qasem,
  • Mohamed S. Attia,
  • Amira Y. Mahfouz,
  • Rawheya A. Salah El Din,
  • Ahmed D. El-Gamal

摘要

Current agricultural production relies heavily on synthetic pesticides, which can damage human beings and the environment. To maintain the availability of food for the world's rapidly expanding population, more environmentally friendly alternatives to chemical pesticides need to be developed. Microalgae contain several antimicrobial chemicals and are regarded as one of the most promising alternative sources of innovative biopesticides. In this work, Ulothrix subtilissima rabenhorst and Mastigocladus laminosus cohn ex kirchner, isolated from Egyptian soil, were utilized to fight Rhizoctonia solani (R. solani) root rot disease and stimulate Pepper's defense mechanisms and growth promotion tactics. The chemical components of the methanolic extract of Ulothrix and Mastigocladus were analyzed by GC–MS and contained several active compounds that exhibited variable efficiency against the pathogen in vitro. The filtrates of Ulothrix and Mastigocladus separately effectively reduced the severity of Rhizoctonia root rot disease by 40% and 17.5%, respectively. Additionally, these treatments increased plant defense responses by 52% and 79%, respectively, compared to the untreated infected plants. The use of microalgal extracts produced varying responses in terms of photosynthetic pigments, total carbohydrate content, and total protein of Rhizoctonia-infected plants. Accordingly, this work presents a promising insight into algal extracts that could effectively limit Rhizoctonia root rot disease and can be used as a natural product against R. solani infection.