[Inhibitory effects and chemical basis of Eucalyptus orelliana wood meals on the growth of Alexandrium tamarense].
To provide information on the screen of newly and efficient algaecides in controlling harmful algal blooms (HABs), the effects of wood meals from Eucalyptus torelliana, Eucalyptus urophylla, Eucalyptus exserta on the growth of Alexandrium tamarense were observed and the chemical basis of the antialgal effect was discussed. The results show that the inhibitory activities of the three wood meals are different, and E. torelliana wood meals have the highest inhibitory activity. There are little differences in antialgal action between asepsis and rude wood meals, suggesting that some antialgal compounds from wood meals may be responsible for the inhibition and that microorganisms from wood meals have little effect on the inhibition. The acetone-water extract from E. torelliana wood meals is shown to have stronger inhibition on A. tamarense than that from ethyl acetate, water and methanol extracts. The acetone-water extract from E. torelliana wood meals was further divided into extract A, B, C and D and the inhibitory activities were compared. The extract D is shown to have highest inhibitory activity. 3 mg/L of the extract appears 81% inhibition rate to A. tamarense in the 3rd day. GC-MS show that extract D contains mostly ketones such as 4-hydroxy-3,5,6-trimethyl-4-(3-oxo-1-butenyl)-2-cyclohexen-1-one and 5,6,7,7a-tetrahydro-4,4,7a-trimethyl-2(4H)-benzofuranone. These results suggest that wood meals from E. torelliana had certain inhibitory effect on A. tamarense, and that ketones may be responsible for the inhibition.
Yang
Wei-dong
WD
Department of Biotechnology, Jinan University, Guangzhou 510632, China. tywd@jnu.edu.cn
Liu
Yu-rong
YR
Liu
Jie-sheng
JS
Liu
Zheng
Z
D000096:Acetone / Q000737:chemistry; D000818:Animals; D004141:Dinoflagellida / Q000187:drug effects* / Q000254:growth & development / Q000302:isolation & purification; D005052:Eucalyptus / Q000737:chemistry* / Q000145:classification; D005068:Eutrophication / Q000187:drug effects; D010936:Plant Extracts / Q000737:chemistry / Q000494:pharmacology*; D013045:Species Specificity; D014876:Water Pollution / Q000517:prevention & control*; D014934:Wood / Q000737:chemistry
D010936:Plant Extracts; D000096:Acetone