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<p><i>Ricinus communis</i> L., an important oilseed crop in India, suffers significant losses from bacterial and fungal diseases. This study evaluated Actinomycetes strains from castor rhizospheric soils in Gujarat for antimicrobial metabolite production. Of 76 isolates, three showed strong antagonism against <i>Xanthomonas axonopodis</i>, with inhibition zones (up to 39.82&#xa0;mm) surpassing standard antibiotics (22.5–28.3&#xa0;mm). Bioactive metabolites were extracted, purified, and characterized via FTIR, GC-MS, and NMR, identifying compounds such as 2-hydroxyethylphosphine and 2-azetidinecarboxylic acid. Optimized fermentation enhanced yields. In vitro and pot experiments demonstrated improved plant growth (shoots: 27.5 → 35.2&#xa0;cm; roots: 10.8 → 13.8&#xa0;cm), while field trials confirmed disease suppression and yield enhancement. The study underscores Actinomycetes-derived metabolites as effective, eco-friendly alternatives to synthetic pesticides for castor cultivation.</p>

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Exploring actinomycete-derived metabolites for sustainable biocontrol of Xanthomonas axonopodis in Ricinus communis L

  • 期刊论文

  • 发表日期：

    2026年3月2日

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  • Bhoomi N. Patel,
  • Priti Patel

摘要

Ricinus communis L., an important oilseed crop in India, suffers significant losses from bacterial and fungal diseases. This study evaluated Actinomycetes strains from castor rhizospheric soils in Gujarat for antimicrobial metabolite production. Of 76 isolates, three showed strong antagonism against Xanthomonas axonopodis, with inhibition zones (up to 39.82 mm) surpassing standard antibiotics (22.5–28.3 mm). Bioactive metabolites were extracted, purified, and characterized via FTIR, GC-MS, and NMR, identifying compounds such as 2-hydroxyethylphosphine and 2-azetidinecarboxylic acid. Optimized fermentation enhanced yields. In vitro and pot experiments demonstrated improved plant growth (shoots: 27.5 → 35.2 cm; roots: 10.8 → 13.8 cm), while field trials confirmed disease suppression and yield enhancement. The study underscores Actinomycetes-derived metabolites as effective, eco-friendly alternatives to synthetic pesticides for castor cultivation.