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<p>Soil pH is a crucial factor affecting soil fertility and plant growth, and it is also a key environmental condition determining the survival status of microorganisms. Dark septate endophytes (DSE) play a positive role in enhancing plant stress resistance and improving soil quality, but their mechanisms for adapting to acid and alkaline stress remain largely unexplored. This study investigated the effects of pH on the growth and metabolism of <i>Alternaria</i> sp. 17463 by culturing the strain under pH conditions of 5.0, 7.0, and 9.0. Results showed optimal growth at pH 7.0, with inhibited growth under acidic and alkaline conditions. Metabolomic analysis revealed <i>Alternaria</i> sp. 17463 secreted pH-buffering metabolites like aspartic acid under alkaline conditions and histidine under acidic conditions, maintaining pH balance. Additionally, secondary metabolites such as flavonoids and terpenoids were produced in response to pH stress, aiding fungal adaptation.</p>

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Dark septate endophytic fungus Alternaria sp. 17463 regulates antioxidant enzymes and metabolism in response to acid-base stress

  • 期刊论文

  • 发表日期：

    2025年10月6日

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  • Yinli Bi,
  • Jing Zhao,
  • Hai Tan,
  • Shishuang Zhang

摘要

Soil pH is a crucial factor affecting soil fertility and plant growth, and it is also a key environmental condition determining the survival status of microorganisms. Dark septate endophytes (DSE) play a positive role in enhancing plant stress resistance and improving soil quality, but their mechanisms for adapting to acid and alkaline stress remain largely unexplored. This study investigated the effects of pH on the growth and metabolism of Alternaria sp. 17463 by culturing the strain under pH conditions of 5.0, 7.0, and 9.0. Results showed optimal growth at pH 7.0, with inhibited growth under acidic and alkaline conditions. Metabolomic analysis revealed Alternaria sp. 17463 secreted pH-buffering metabolites like aspartic acid under alkaline conditions and histidine under acidic conditions, maintaining pH balance. Additionally, secondary metabolites such as flavonoids and terpenoids were produced in response to pH stress, aiding fungal adaptation.