College of Environmental Science and Engineering, Ocean University of China, Key Laboratory of Ocean Ecology & Environment, Ministry of Education, Qingdao, 266100, China.
*Correspondence author: E-mail: lfm01@ouc.edu.cn.
1Department of Environmental Science and Engineering, Tsinghua University, Beijing, 100084, China.
We evaluated the allelopathic activity of 7-spp. of large seaweeds (Undaria pinnatifida (Harv.) Suringar, Entermorpha prolifera (Muell) J. Ag, Grateloupia filicina (Wulf.) C. Agardh, Sargassum sp, Ulva pertusa Kjellm., Porphyra haitanensis and Sargassum fusiforme (Harv.) setch.) on Gymnodinium breve Davis. Both E. Prolifera and U. Pertusa proved most inhibitory and caused 98% and 94% Inhibition in growth of G. breve and their median effective concentration (EC50) values were 2.95 and 1.45 gL−1, respectively. The ethanol extract from U. pertusa was analyzed using GC-MS and indicated the presence of 18 components in the extract. The main component was 1,2-benzenedicarboxylic acid, bis (2-methylpropyl) ester. Both E. Prolifera and U. Pertusa exhibited strong allelopathic activity against the growth of G. breve. All the chemicals need further research for confirmation.
Allelopathy, GC-MS, Gymnodinium breve Davis, large seaweed, red tide
