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<p>The heterotrophic marine protist <i>Labyrinthula</i> plays various roles in the environment, from pathogen to symbiont to saprobic decomposer. Mangroves are notably rich in detritus that supports the saprotrophic lifestyle of these organisms, making this environment a hotspot for labyrinthulid biodiversity. In this study, <i>Labyrinthula</i> were isolated from decaying leaves found at 14 different mangrove sites in Okinawa, Japan (26°09'28.1"–26°44'34.8"N, 127°39'56.5"–128°18'55.6"E) in October 2024. A total of 61 isolates in 6 lineages were identified and characterized based on morphological and molecular data. Phylogenetic analyses based on the 18S rRNA gene and ITS region grouped all lineages with previously reported non-pathogenic labyrinthulid isolates. Two of the six lineages grouped with existing <i>Labyrinthula</i> species-letter groups “M” and “Q = V”, one formed a hitherto unnamed clade with an existing sequence from the gill tissue of <i>Psetta maxima</i>, and three branched independently, indicating the discovery of three novel <i>Labyrinthula </i>spp. The four unnamed lineages have thus been designated as Lineages O1, O2, O3, and O4. Sequences in this study also grouped with other <i>Labyrinthula</i> spp. from mangrove leaves, seawater, seagrass, and turfgrass across different geographical locations, demonstrating the ecological plasticity of the group. The genetic records made available in this study provide the groundwork for further understanding the ecological role of <i>Labyrinthula</i> in mangroves and its cultivable diversity.</p>

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High genetic diversity of Labyrinthula spp. inhabiting mangrove leaf detritus in Okinawa, Japan

  • 期刊论文

  • 发表日期：

    2025年12月2日

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  • Natalia C. Araña,
  • Siratee Riewluang,
  • Fernando Arteaga Arteaga,
  • Marcel Pascal Beier,
  • Kevin C. Wakeman

摘要

The heterotrophic marine protist Labyrinthula plays various roles in the environment, from pathogen to symbiont to saprobic decomposer. Mangroves are notably rich in detritus that supports the saprotrophic lifestyle of these organisms, making this environment a hotspot for labyrinthulid biodiversity. In this study, Labyrinthula were isolated from decaying leaves found at 14 different mangrove sites in Okinawa, Japan (26°09'28.1"–26°44'34.8"N, 127°39'56.5"–128°18'55.6"E) in October 2024. A total of 61 isolates in 6 lineages were identified and characterized based on morphological and molecular data. Phylogenetic analyses based on the 18S rRNA gene and ITS region grouped all lineages with previously reported non-pathogenic labyrinthulid isolates. Two of the six lineages grouped with existing Labyrinthula species-letter groups “M” and “Q = V”, one formed a hitherto unnamed clade with an existing sequence from the gill tissue of Psetta maxima, and three branched independently, indicating the discovery of three novel Labyrinthula spp. The four unnamed lineages have thus been designated as Lineages O1, O2, O3, and O4. Sequences in this study also grouped with other Labyrinthula spp. from mangrove leaves, seawater, seagrass, and turfgrass across different geographical locations, demonstrating the ecological plasticity of the group. The genetic records made available in this study provide the groundwork for further understanding the ecological role of Labyrinthula in mangroves and its cultivable diversity.