Allelopathic effects of <i>Sesuvium portulacastrum</i> on three typical red tide dinoflagellates and identification of potential allelopathic substances

Wu Kemin; Lu Jieyi; Huang Lingfeng

doi:10.12284/hyxb2025042

Volume 47 Issue 3

Mar. 2025

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Wu Kemin，Lu Jieyi，Huang Lingfeng. Allelopathic effects of Sesuvium portulacastrum on three typical red tide dinoflagellates and identification of potential allelopathic substances[J]. Haiyang Xuebao，2025, 47(3)：73–84 doi: 10.12284/hyxb2025042

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Wu Kemin，Lu Jieyi，Huang Lingfeng. Allelopathic effects of Sesuvium portulacastrum on three typical red tide dinoflagellates and identification of potential allelopathic substances[J]. Haiyang Xuebao，2025, 47(3)：73–84 doi: 10.12284/hyxb2025042

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Allelopathic effects of Sesuvium portulacastrum on three typical red tide dinoflagellates and identification of potential allelopathic substances

doi: 10.12284/hyxb2025042

Wu Kemin^1
,,
Lu Jieyi¹,
Huang Lingfeng^{1
,
,}

Key Laboratory of the Ministry of Education for Coastal Wetland Ecosystems, College of the Environment and Ecology, Xiamen University, Xiamen 361102, China

Received Date: 2024-08-24
Rev Recd Date: 2025-01-14

Available Online: 2025-04-18

Publish Date: 2025-03-31

Abstract

Abstract

This study aimed to investigate the allelopathic effects of Sesuvium portulacastrum (Aizoaceae) on typical red tide algae and identify the sources of the active compounds. Three red tide algae species, Prorocentrum micans, Karenia mikimotoi, and Alexandrium catenella, were selected as test subjects. The planting water of the coastal salt-tolerant plant Sesuvium portulacastrum served as the research material. Root exudates from the plant were adsorbed using a C₁₈ solid-phase extraction column and then extracted with methanol, ethyl acetate, dichloromethane, and n-hexane. The four extracts exhibited varying degrees of inhibition on the growth of the algae, with the dichloromethane extract showing the most significant inhibitory effect. At a concentration of 10 g/L, the inhibition rates for the three algae species were 50.83%, 97.30%, and 81.41%, respectively. Gas chromatography-mass spectrometry (GC-MS) analysis identified 19 fatty acids and their derivatives. Among these, stearic acid, oleamide, and docosanol exhibited algicidal activity, with docosanol showing the strongest effect. At a concentration of 2 mg/L, the inhibition rates for the three algae species were 90%, 100%, and 81.04%, respectively. These results indicate that Sesuvium portulacastrum can release fatty acids and their derivatives to inhibit the growth of red tide algae, demonstrating its potential as a plant-based tool for red tide control and environmental remediation.
- Sesuvium portulacastrum,
- root exudates,
- allelopathic substances,
- red tide dinoflagellates,
- fatty acids and their derivatives

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References(42)

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