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Article

Algicidal Activity of Cyperus rotundus Aqueous Extracts Reflected by Photosynthetic Efficiency and Cell Integrity of Harmful Algae Phaeocystis globosa

by 1,†, 1,†, 2, 2, 3, 1 and 1,*
1
Department of Ecology, College of Life Science and Technology, Jinan University, Guangzhou 510632, China
2
South China Institute of Environmental Science, Ministry of Ecology and Environment, Guangzhou 510535, China
3
Institute of Groundwater and Earth Sciences, Jinan University, Guangzhou 510632, China
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Water 2020, 12(11), 3256; https://doi.org/10.3390/w12113256
Received: 17 September 2020 / Revised: 13 November 2020 / Accepted: 16 November 2020 / Published: 20 November 2020
(This article belongs to the Section Oceans and Coastal Zones)
Phaeocystis globosa is regarded as a notoriously harmful algal bloom species. Suppressing harmful algae using algicidal substances extracted from plants is considered an effective method. The physiological and biochemical processes of P. globosa were explored by exposure to different concentrations of aqueous extracts of Cyperus rotundus. All treatments indicated various inhibitory effects on the algal growth compared to the control samples without adding extracts. At 48 h, the 4, 8, and 16 mg/mL treatment groups showed a significant inhibitory effect, consistent with a decrease in the chlorophyll-a content and photosynthetic efficiency. The images of the transmission electron microscope (TEM) further confirmed that a subset of the cells in the treatment groups exhibited morphological anomalies. The algicidal active substances were mainly identified as phenolic acids containing maximal content of quinic acid in aqueous extracts according to the results of ultra-high-performance liquid chromatography-tandem time-of-flight mass spectrometer (UPLC-HRMS). The 50% anti-algal effect concentration of quinic acid was 22 mg/L at 96 h (EC50–96h). Thus, the phenolic acids might be considered as major inhibitors of the growth of P. globosa. These results demonstrated that the aqueous extracts of C. rotundus could potentially control the growth of P. globosa. View Full-Text
Keywords: bioavailability; HABs control; invasive weed; phenolic acids; physiological responses bioavailability; HABs control; invasive weed; phenolic acids; physiological responses
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MDPI and ACS Style

Lan, Y.; Chen, Q.; Gou, T.; Sun, K.; Zhang, J.; Sun, D.; Duan, S. Algicidal Activity of Cyperus rotundus Aqueous Extracts Reflected by Photosynthetic Efficiency and Cell Integrity of Harmful Algae Phaeocystis globosa. Water 2020, 12, 3256. https://doi.org/10.3390/w12113256

AMA Style

Lan Y, Chen Q, Gou T, Sun K, Zhang J, Sun D, Duan S. Algicidal Activity of Cyperus rotundus Aqueous Extracts Reflected by Photosynthetic Efficiency and Cell Integrity of Harmful Algae Phaeocystis globosa. Water. 2020; 12(11):3256. https://doi.org/10.3390/w12113256

Chicago/Turabian Style

Lan, Yu; Chen, Qi; Gou, Ting; Sun, Kaifeng; Zhang, Jin; Sun, Dong; Duan, Shunshan. 2020. "Algicidal Activity of Cyperus rotundus Aqueous Extracts Reflected by Photosynthetic Efficiency and Cell Integrity of Harmful Algae Phaeocystis globosa" Water 12, no. 11: 3256. https://doi.org/10.3390/w12113256

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