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<p>Manganese (Mn) is an essential trace element for all photosynthetic life, playing an integral role in their photosystems, metabolism, and antioxidant activity. For corals, most studies focus on the potential toxicity of Mn at high concentrations (e.g. &gt;700 µg L<sup>-1</sup>). However, there has been less exploration on beneficial, biologically relevant levels of Mn. Combining promtomics, ICP, and PAM fluorometry, we evaluate how Mn supplementation at increasing concentrations (0.5, 4.8, 11.4, 15.6 µg L<sup>-1</sup>) alters the physiology and proteome of the model cnidarian, <i>Exaiptasia diaphana</i>, when subjected to ambient (26 ˚C) and elevated (32 ˚C) temperatures. We demonstrate that Mn from 4.8 to 15.6 µg L<sup>-1</sup> mitigates thermal stress to <i>E. diaphana</i>, resulting in reduced photochemical damage and symbiont expulsion. Derived photobiology and proteomics data contributes to a mechanistic model for how Mn reduces thermal susceptibility, supporting the viability of Mn additions to enhance the protective capacities of photosynthetic cnidarians during heatwaves.</p>

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Manganese supplementation enhances cnidarian–dinoflagellate symbiosis under thermal stress

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月24日

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  • Hadley England,
  • Clinton A. Oakley,
  • Andrei Herdean,
  • David J. Hughes,
  • Kittikun Songsomboon,
  • Jennifer L. Matthews,
  • Emma F. Camp

摘要

Manganese (Mn) is an essential trace element for all photosynthetic life, playing an integral role in their photosystems, metabolism, and antioxidant activity. For corals, most studies focus on the potential toxicity of Mn at high concentrations (e.g. >700 µg L-1). However, there has been less exploration on beneficial, biologically relevant levels of Mn. Combining promtomics, ICP, and PAM fluorometry, we evaluate how Mn supplementation at increasing concentrations (0.5, 4.8, 11.4, 15.6 µg L-1) alters the physiology and proteome of the model cnidarian, Exaiptasia diaphana, when subjected to ambient (26 ˚C) and elevated (32 ˚C) temperatures. We demonstrate that Mn from 4.8 to 15.6 µg L-1 mitigates thermal stress to E. diaphana, resulting in reduced photochemical damage and symbiont expulsion. Derived photobiology and proteomics data contributes to a mechanistic model for how Mn reduces thermal susceptibility, supporting the viability of Mn additions to enhance the protective capacities of photosynthetic cnidarians during heatwaves.