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<p>This investigation evaluated the biostimulating efficacy of <i>Sargassum</i> extracts on the in vitro culture systems of the macroalga <i>Ulva intestinalis</i> and the microalga <i>Chlorella sorokiniana</i>. Extracts from <i>Sargassum polycystum</i> (BSA) and <i>Sargassum wightii</i> (BSB) were prepared using hot-water extraction and incorporated into growth media at 0.1%, 0.5%, and 1%. In <i>U. intestinalis</i>, both extracts produced positive growth responses at lower concentrations, with the highest biomass observed at 0.1%. Maximum chlorophyll and protein contents in <i>U. intestinalis</i> were recorded at 0.5% for both biostimulants. In <i>C. sorokiniana</i>, BSA exhibited a linear growth-promoting effect across the tested concentrations, whereas 0.5% BSB resulted in the greatest biomass increase. Photosynthetic pigment analysis showed that 0.5% BSA maximized chlorophyll production, while 1% BSB enhanced total carotenoid and lutein accumulation. However, 1% BSB slowed biomass doubling in <i>C. sorokiniana</i> and caused marked biomass reduction in <i>U. intestinalis</i>. Overall, the findings demonstrate that both the <i>Sargassum</i>-derived biostimulants can enhance biomass accumulation and pigment synthesis in both algae when applied at optimal levels, with particularly strong effects on pigment assimilation in <i>C. sorokiniana</i>. The study also highlights a biphasic hormetic response with both stimulants, wherein higher biostimulant concentrations resulted in growth retardation and biomass depletion.</p> Graphical Abstract <p></p>

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Comparative Responses of Ulva Intestinalis and Chlorella Sorokiniana to Sargassum Derived Biostimulant: Implications on Biomass and Pigment Enhancement

  • 期刊论文

  • 发表日期：

    2026年7月2日

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  • Karuna Kumari Radha,
  • J. T. Mary Leema,
  • Nambali Valsalan Vinithkumar,
  • Dilip Kumar Jha,
  • Gopal Dharani

摘要

This investigation evaluated the biostimulating efficacy of Sargassum extracts on the in vitro culture systems of the macroalga Ulva intestinalis and the microalga Chlorella sorokiniana. Extracts from Sargassum polycystum (BSA) and Sargassum wightii (BSB) were prepared using hot-water extraction and incorporated into growth media at 0.1%, 0.5%, and 1%. In U. intestinalis, both extracts produced positive growth responses at lower concentrations, with the highest biomass observed at 0.1%. Maximum chlorophyll and protein contents in U. intestinalis were recorded at 0.5% for both biostimulants. In C. sorokiniana, BSA exhibited a linear growth-promoting effect across the tested concentrations, whereas 0.5% BSB resulted in the greatest biomass increase. Photosynthetic pigment analysis showed that 0.5% BSA maximized chlorophyll production, while 1% BSB enhanced total carotenoid and lutein accumulation. However, 1% BSB slowed biomass doubling in C. sorokiniana and caused marked biomass reduction in U. intestinalis. Overall, the findings demonstrate that both the Sargassum-derived biostimulants can enhance biomass accumulation and pigment synthesis in both algae when applied at optimal levels, with particularly strong effects on pigment assimilation in C. sorokiniana. The study also highlights a biphasic hormetic response with both stimulants, wherein higher biostimulant concentrations resulted in growth retardation and biomass depletion.

Graphical Abstract