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<p>This study investigates the effects of elevated <i>p</i>CO<sub>2</sub> on the physiological and metabolic responses of the edible seaweed, <i>Caulerpa lentillifera</i> under laboratory conditions. Cultivation was conducted for 14&#xa0;days, simulating current (~ pH 8.1) and future projected (~ pH 7.8) ocean conditions. The study assessed photosynthetic efficiency through F<sub>v</sub>/F<sub>m</sub> values, revealing that <i>C. lentillifera</i> did not experience significant photosynthetic stress under elevated <i>p</i>CO<sub>2</sub>. However, significant changes in photosynthetic parameters highlighted the complexity of algal responses to increased <i>p</i>CO<sub>2</sub> level over time. Notably, an enhancement in α, E<sub>k</sub> and rETR<sub>max</sub>, accompanied by a decrease in photosynthetic pigments, suggests that under elevated <i>p</i>CO<sub>2</sub> conditions, the photosynthetic system reaches optimal state. Metabolomic analysis revealed shifts in the metabolic profile, including higher levels of ketovaline, a precursor of valine and leucine, and elevated concentrations of caffeine, oxalate, and gallic acid, metabolites associated with cellular stress responses and bioactivity. Collectively, these results indicate that <i>C. lentillifera</i> can regulate its physiological and metabolic processes under elevated <i>p</i>CO<sub>2</sub>, reflecting potential resilience to future ocean acidification scenarios and offering insights for its sustainable cultivation.</p>

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Exploring the physio-biochemical and metabolic shifts in a green alga, Caulerpa lentillifera (J.Agardh) in response to elevated pCO2 level

  • 期刊论文

  • 发表日期：

    2026年5月16日

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  • Pei-Tian Goh,
  • Sze-Wan Poong,
  • Xinqing Zheng,
  • Tao Liu,
  • Zizhong Qi,
  • John Beardall,
  • Phaik-Eem Lim

摘要

This study investigates the effects of elevated pCO2 on the physiological and metabolic responses of the edible seaweed, Caulerpa lentillifera under laboratory conditions. Cultivation was conducted for 14 days, simulating current (~ pH 8.1) and future projected (~ pH 7.8) ocean conditions. The study assessed photosynthetic efficiency through Fv/Fm values, revealing that C. lentillifera did not experience significant photosynthetic stress under elevated pCO2. However, significant changes in photosynthetic parameters highlighted the complexity of algal responses to increased pCO2 level over time. Notably, an enhancement in α, Ek and rETRmax, accompanied by a decrease in photosynthetic pigments, suggests that under elevated pCO2 conditions, the photosynthetic system reaches optimal state. Metabolomic analysis revealed shifts in the metabolic profile, including higher levels of ketovaline, a precursor of valine and leucine, and elevated concentrations of caffeine, oxalate, and gallic acid, metabolites associated with cellular stress responses and bioactivity. Collectively, these results indicate that C. lentillifera can regulate its physiological and metabolic processes under elevated pCO2, reflecting potential resilience to future ocean acidification scenarios and offering insights for its sustainable cultivation.