红树植物秋茄叶片水提物的抑藻效应  

Inhibitory effects of aqueous extracts from mangrove plant Kandelia candel leaves on microalgae

作　　者：孙志伟[1] 田斐[1] 安民 段舜山[1] 

机构地区：[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 Analyti-cal Laboratories,Faculty of Science,Charles Sturt University

出　　处：《生态学杂志》2012年第9期2241-2246,共6页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(41176104);国家自然科学联合基金重点项目(U1133003)资助

摘　　要：通过藻细胞密度的测定,探讨了不同浓度(0.5、1.0和2.0g·L-1)红树植物秋茄(Kandelia candel)新鲜叶片水提物对球形棕囊藻(Phaeocystis globosa)和赤潮异弯藻(Het-erosigma akashiwo)的化感抑制效应,研究了高温处理对秋茄提取物化感作用的影响。结果表明:秋茄叶片提取物对两种赤潮藻均具有显著的化感抑制作用,不同浓度提取物化感作用强度不同;5d内,浓度为2.0g·L-1秋茄叶片提取物对球形棕囊藻和赤潮异弯藻的最大抑制率分别为91.6%和77.0%;球形棕囊藻和赤潮异弯藻对红树植物秋茄提取物的敏感性不同,提取物对球形棕囊藻的抑制效果要优于赤潮异弯藻;经高温处理后,秋茄提取物抑藻效果显著降低(P<0.05);秋茄叶片水提物影响藻细胞膜结构,使藻细胞体积增大、细胞破裂。Through the measurement of algal cell density, this paper evaluated the allelopathic inhibitory effects of different concentration （0.5, 1.0, and 2.0 g·L-1） aqueous extracts from the fresh leaves of mangrove plant Kandelia candel on Phaeocystis globosa and Heterosigma akashiwo. The impacts of heat treatment on the allelopathic effects of the extracts were also examined. The leaf extracts of K. candel had significant inhibitory effects on the two microalgae, and the effects were concentration-dependent. In five days, the maximum inhibitory rates of the extracts at 2.0 g·L-1 on P. globosa and H. akashiwo were 91.6% and 77.0%, respectively. P. globosa and H. akashiwo had different sensitivity to the extracts. The inhibitory effect of the extracts was stronger on P. globosa than on H. akashiwo. Heat treatment decreased the inhibitory effects of the extracts significantly （P〈0.05）. The extracts damaged the cell membrane of the microalgae, making their cells expanded and broken.

关 键 词：化感作用 秋茄 球形棕囊藻 赤潮异弯藻 

分 类 号：X173[环境科学与工程—环境科学]