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<p>Fermentation of <i>Aspergillus niger</i> isolated from the leaves of <i>Basella alba</i> in potato dextrose broth medium furnished five naphtho-γ-pyrone type compounds, TMC 256A1 (<b>1</b>), rubrofusarin B (<b>2</b>), fonsecin B (<b>3</b>), aurasperone A (<b>4</b>) and fonsecinone A (<b>5</b>). Compounds <b>1</b>, <b>2</b> and <b>3</b> showed remarkable phytotoxic activity in lettuce seed germination bioassay with IC<sub>50</sub> values of 45.4, 49.7 and 47.8&#xa0;ppm percentage radicle growth inhibition, respectively, while IC<sub>50</sub> values for percentage hypocotyl growth inhibition were 49.7, 48.7 and 48.2&#xa0;ppm, respectively. This is the first report on the isolation of <i>A. niger</i> from <i>Basella alba</i> and the phytotoxic activity of compounds <b>1</b>–<b>3</b> in lettuce seed germination assay.</p>

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Phytotoxic naphtho-γ-pyrones from an endophytic fungus Aspergillus niger from Basella alba

  • 期刊论文

  • 发表日期：

    2025年10月21日

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  • K. G. N. P. Piyasena,
  • W. A. R. T. Wickramarachchi,
  • N. Savitri Kumar,
  • Nimal Adikaram,
  • Lalith Jayasinghe,
  • Hiroshi Araya,
  • Yoshinori Fujimoto

摘要

Fermentation of Aspergillus niger isolated from the leaves of Basella alba in potato dextrose broth medium furnished five naphtho-γ-pyrone type compounds, TMC 256A1 (1), rubrofusarin B (2), fonsecin B (3), aurasperone A (4) and fonsecinone A (5). Compounds 1, 2 and 3 showed remarkable phytotoxic activity in lettuce seed germination bioassay with IC50 values of 45.4, 49.7 and 47.8 ppm percentage radicle growth inhibition, respectively, while IC50 values for percentage hypocotyl growth inhibition were 49.7, 48.7 and 48.2 ppm, respectively. This is the first report on the isolation of A. niger from Basella alba and the phytotoxic activity of compounds 1–3 in lettuce seed germination assay.