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<p>Fruit producers and exporters around the world are grappling with challenges related to post-harvest fruit decay, particularly in fruits such as apples and oranges destined for export, leading to waste and financial losses. The filamentous fungi, specifically <i>Penicillium</i> species, are the primary post-harvest pathogens affecting apples and oranges. This study evaluated the use of five non<i>-Saccharomyces</i> yeast species (<i>Suhomyces pyralidae, Meyerozyma guilliermondii, Pichia kluyveri</i>, <i>Zygoascus helenicus</i> and <i>Aureobasidium melanogenum</i>) as biocontrol agents against <i>Penicillium expansum</i>, <i>P. digitatum</i> and <i>P. italicum</i>. The yeasts were screened for their inhibitory effects using radial inhibition and mouth-to-mouth assays on agar plates and post-harvest trials on apples and oranges. <i>Aureobasidium melanogenum</i> exhibited the most significant growth inhibition in the radial inhibition assay, achieving 60%, 100% and 70% inhibition against <i>P. expansum</i>, <i>P. digitatum</i> and <i>P. italicum,</i> respectively. In the volatile compound assay, <i>Pi. kluyveri</i> achieved complete (100%) inhibition of <i>P. expansum, P. digitatum</i> and <i>P. italicum.</i> Seven volatile compounds were identified, isobutanol, 2-phenylethanol, isoamyl acetate, isoamyl alcohol and 2-phenethyl acetate associated with the inhibition of <i>P. expansum</i>. In post-harvest trials, the yeast treatments displayed limited inhibition activity on apples (<i>ca.</i> 15%). However, on oranges, <i>M. guilliermondii</i> demonstrated substantial inhibition, achieving 72% and 77% inhibition against <i>P. digitatum</i> and <i>P. italicum,</i> respectively<i>.</i> These findings suggest that the selected yeast species have potential as biological control agents against <i>P. expansum, P. digitatum</i> and <i>P. italicum</i>, although further research is required to fully understand and optimise their application.</p>

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Biocontrol Potential of Non-Saccharomyces Yeasts Against Post-Harvest Penicillium Species in Apples and Oranges

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年9月4日

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  • Zukisani Gomomo,
  • Morris Fanadzo,
  • Maxwell Mewa-Ngongang,
  • Justin Hoff,
  • Marieta van der Rijst,
  • Lucky Mokwena,
  • Jeremy J. Boonzaier,
  • Rodney S. Hart,
  • Heinrich W. du Plessis

摘要

Fruit producers and exporters around the world are grappling with challenges related to post-harvest fruit decay, particularly in fruits such as apples and oranges destined for export, leading to waste and financial losses. The filamentous fungi, specifically Penicillium species, are the primary post-harvest pathogens affecting apples and oranges. This study evaluated the use of five non-Saccharomyces yeast species (Suhomyces pyralidae, Meyerozyma guilliermondii, Pichia kluyveri, Zygoascus helenicus and Aureobasidium melanogenum) as biocontrol agents against Penicillium expansum, P. digitatum and P. italicum. The yeasts were screened for their inhibitory effects using radial inhibition and mouth-to-mouth assays on agar plates and post-harvest trials on apples and oranges. Aureobasidium melanogenum exhibited the most significant growth inhibition in the radial inhibition assay, achieving 60%, 100% and 70% inhibition against P. expansum, P. digitatum and P. italicum, respectively. In the volatile compound assay, Pi. kluyveri achieved complete (100%) inhibition of P. expansum, P. digitatum and P. italicum. Seven volatile compounds were identified, isobutanol, 2-phenylethanol, isoamyl acetate, isoamyl alcohol and 2-phenethyl acetate associated with the inhibition of P. expansum. In post-harvest trials, the yeast treatments displayed limited inhibition activity on apples (ca. 15%). However, on oranges, M. guilliermondii demonstrated substantial inhibition, achieving 72% and 77% inhibition against P. digitatum and P. italicum, respectively. These findings suggest that the selected yeast species have potential as biological control agents against P. expansum, P. digitatum and P. italicum, although further research is required to fully understand and optimise their application.