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| Study on the Allelopathic Inhibition of Chlorella Pyrenoidosa by Tall Oil and Its Mechanism |
| Received:November 18, 2020 |
| DOI：10.11981/j.issn.1000-6842.2022.01.65 |
| Key Words:tall oil;allelopathy of algae;Chlorella pyrenoidosa;antioxidant enzymes;particle size |
| Author Name | Affiliation | E-mail | | WANG Yanyan* | Tianjin Key Laboratory of Pulp & paper， Tianjin University of Science & Technology， Tianjin， 300457 | 18322291768@163.com | | ZHAO Mengxing | Tianjin Key Laboratory of Pulp & paper， Tianjin University of Science & Technology， Tianjin， 300457 | | | LIU Tingzhi | Tianjin Key Laboratory of Pulp & paper， Tianjin University of Science & Technology， Tianjin， 300457 | |
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| Abstract: |
| In this study， tall oil was used as an allelochemical to study its anti-algae effect on Chlorella pyrenoidosa and the mechanism of which was preliminarily explored. The results showed that the growth and reproduction of Chlorella pyrenoidosa could be effectively controlled by 150 and 100 mg/L tall oil with inhibition rates of >80% and up to 88%. Under the action of tall oil， the activities of CAT and SOD were both irritably increased， 4 times higher than that of the control group and the chlorophyll A content of algal cells decreased linearly. Tall oil could render a sunken or even ruptured appearance of algal cells. Studies on the Zeta potential of algae cells showed that compared with the control group， the absolute value of Zeta potential decreased by 56% in the tall oil group， and algal cells tended to flocculate. Tall oil expanded the size distribution range of algae liquid particles， the contents of debris smaller than the normal cell size and algae cell clusters larger than the normal cell size both increased， therefore， the average size of algae liquid particles in tall oil group increased by 25% compared with the control group. In addition， it was found that the proportion of dead cells increased significantly after adding tall oil， from 9.7% of control group to 62.8% （100 mg/L） and 75.7% （150 mg/L）， respectively. |
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