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<p>Si:N has changed in many coastal ecosystems, altering phytoplankton dynamics and ecosystem functions. Phytoplankton biochemical composition, such as lipids, regulates trophic interactions. However, the changes in phytoplankton lipid production and associated physiological mechanisms under variable Si:N conditions are still uncertain. We quantified the production of major lipids (sterols and fatty acids (FAs)) and Fv:Fm (maximum photosynthetic efficiency of PS II) under different Si:N molar ratios (0.25, 1.00, and 1.75) in marine dinoflagellate <i>Prorocentrum donghaiense</i> and diatom <i>Phaeodactylum tricornutum</i>. Imbalanced Si:N overall reduced carbon-normalized contents of major sterols in both species (up to −33%) and caused significant changes in FA proportions in the diatoms (−6%–+3%) but not in the dinoflagellates (−3%–+3%). Fv:Fm increased in the diatoms (<i>ca.</i> +9%) but decreased in the dinoflagellates (<i>ca.</i> −60%) as Si:N decreased. Lipid contents correlated positively with Fv:Fm in the diatoms but not in the dinoflagellates. Such differential responses between diatoms and dinoflagellates can be attributed to their specific physiological mechanisms (<i>e.g.</i>, photosynthetic performance and lipid metabolic pathways), indicating that the changes in Si:N can influence the nutritional quality of phytoplankton, particularly in coastal environments with high diatom and dinoflagellate proportions.</p>

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Imbalanced Si:N Alters Lipid Production and Photosynthesis in the Marine Diatom Phaeodactylum tricornutum and Dinoflagellate Prorocentrum donghaiense

  • 期刊论文

  • 发表日期：

    2026年5月13日

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  • Jiaxuan Cui,
  • Chuanli Zhang,
  • Rong Bi,
  • Yunyun Zhuang,
  • Xiaoqian Pan,
  • Xiao Qin,
  • Zhong Cao,
  • Hailong Zhang,
  • Li Li,
  • Yang Ding,
  • Meixun Zhao

摘要

Si:N has changed in many coastal ecosystems, altering phytoplankton dynamics and ecosystem functions. Phytoplankton biochemical composition, such as lipids, regulates trophic interactions. However, the changes in phytoplankton lipid production and associated physiological mechanisms under variable Si:N conditions are still uncertain. We quantified the production of major lipids (sterols and fatty acids (FAs)) and Fv:Fm (maximum photosynthetic efficiency of PS II) under different Si:N molar ratios (0.25, 1.00, and 1.75) in marine dinoflagellate Prorocentrum donghaiense and diatom Phaeodactylum tricornutum. Imbalanced Si:N overall reduced carbon-normalized contents of major sterols in both species (up to −33%) and caused significant changes in FA proportions in the diatoms (−6%–+3%) but not in the dinoflagellates (−3%–+3%). Fv:Fm increased in the diatoms (ca. +9%) but decreased in the dinoflagellates (ca. −60%) as Si:N decreased. Lipid contents correlated positively with Fv:Fm in the diatoms but not in the dinoflagellates. Such differential responses between diatoms and dinoflagellates can be attributed to their specific physiological mechanisms (e.g., photosynthetic performance and lipid metabolic pathways), indicating that the changes in Si:N can influence the nutritional quality of phytoplankton, particularly in coastal environments with high diatom and dinoflagellate proportions.