Allelopathic effects of gallic acid from Aegiceras corniculatum on Cyclotella caspia  

作　　者：Yu Liu Fei Li Qixin Huang 

机构地区：[1]School of Environmental Science and Engineering,Sun Yat-Sen University [2]Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology

出　　处：《Journal of Environmental Sciences》2013年第4期776-784,共9页环境科学学报（英文版）

基　　金：supported by the National Nature Science Foundation of China (No. 41171416);the National High-Tech Research and Development Program (863) of China (No. 2007AA091703)

摘　　要：High abundance of algae and eutrophication were observed in mangrove wetlands and these were estimated to be associated with root exudates of some specific mangrove plants to a certain extent. Root exudates form allelopathic effects from mangroves. The main secondary metabolites of Aegiceras corniculatum had been detected to be organic phenolic acids. Gallic acid had been isolated and identified from A. corniculatum. The half-maximal inhibitory concentration of gallic acid on alge Cyclotella caspia was tested as 15.46 mg/L. The effects on algal cell morphology were mainly shown as elongated cells, with no apparent cell inclusions, such as oil droplets, chloroplast. At a dose of 2 mg/L, gallic acid had a stimulative effect on the specific growth rate of algae on day 3. The contents of malondialdehyde, superoxide dismutase, soluble carbohydrates and chlorophyll a in algal cells showed an overall ＂low promotion and high suppression＂. Our results could provide preliminary and valuable reference on the complex influences of mangroves on microecology and microbial communities in the rhlzosphere system.High abundance of algae and eutrophication were observed in mangrove wetlands and these were estimated to be associated with root exudates of some specific mangrove plants to a certain extent. Root exudates form allelopathic effects from mangroves. The main secondary metabolites of Aegiceras corniculatum had been detected to be organic phenolic acids. Gallic acid had been isolated and identified from A. corniculatum. The half-maximal inhibitory concentration of gallic acid on alge Cyclotella caspia was tested as 15.46 mg/L. The effects on algal cell morphology were mainly shown as elongated cells, with no apparent cell inclusions, such as oil droplets, chloroplast. At a dose of 2 mg/L, gallic acid had a stimulative effect on the specific growth rate of algae on day 3. The contents of malondialdehyde, superoxide dismutase, soluble carbohydrates and chlorophyll a in algal cells showed an overall ＂low promotion and high suppression＂. Our results could provide preliminary and valuable reference on the complex influences of mangroves on microecology and microbial communities in the rhlzosphere system.

关 键 词：MANGROVE root exdutes MICROALGAE ALLELOPATHY phenolic acids gallic acid 

分 类 号：S718.5[农业科学—林学]