1. 暨南大学水生生物研究中心, 广东省高校水体富营养化与赤潮防治重点实验室, 广州 510632; 2. Environmental and Analytical Laboratories, Faculty of Science,Charles Sturt University, NSW 2678, Australia
Inhibitive effects of organic solvent extracts from mangrove plant Bruguiera gymnorrhiza on Phaeocystis globosa
SUN Zhi-wei1, TIAN Fei1, An Min2, DUAN Shun-shan1
1. Research Centre of Hydrobiology, Key Laboratory of Aquatic Eutrophication and Control of Harmful Algal Blooms of Guangdong Higher Education Institutes, Jinan University, Guangzhou 510632, China; 2. Environmental and Analytical Laboratories, Faculty of Science, Charles Sturt University, Wagga Wagga, NSW 2678, Australia
Based on allelopathic principles,we used organic solvents to extract the active substances from mangrove plant Bruguiera gymnorrhiza,and extracts of hexane phase,ethyl acetate phase,n-butyl alcohol phase and water phase were obtained respectively.The experiment was carried out to test the inhibitive effects of these extracts on algae.Measuring the cell density of Phaeocystis globosa,we found that all of the extracts had significantly inhibitive effects on P.globosa,and the inhibitive effects of extracts of hexane phase and ethyl acetate phase were better than those of n-butyl alcohol phase and water phase.The 48h-EC50 of extracts of hexane phase and ethyl acetate phase on P.globosa were 14.90 mg/L and 12.18 mg/L,respectively.The initial algal density(IAD) was considered an important factor to influence the inhibitive effects of extracts.The inhibitive rate(IR) was high at low IAD,while it decreased with the increasing of IAD.At a higher IAD,the extracts promoted the growth of P.globosa,rather than inhibited the growth.
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