凤眼莲浸出液对东海原甲藻生长的抑制作用

研究了凤眼莲浸出液对赤潮藻东海原甲藻生长的影响。浸出液浓度以单位体积溶液中所含凤眼莲鲜重表示。结果显示,在浸出液浓度大于2g·L^-1时,活体凤眼莲浸出液和干凤眼莲浸出液对东海原甲藻的生长都有明显的抑制作用。在浸出液浓度达到8g·L^-1时,活体凤眼莲浸出液和干凤眼莲浸出液对东海原甲藻都具有杀灭作用,东海原甲藻全部死亡出现的时间分别为培养后的第4t和第5t。经121℃高温处理20min后的活体凤眼莲浸出液对东海原甲藻的抑制作用仍然存在,抑制作用并没有显著减弱。研究结果表明凤眼莲的抑藻物质具有用来控制赤潮生物东海原甲藻的潜在价值。

Inhibitory effect of extracts from Eichhornia crassipes on the growth of Prorocentrum donghaiense

This study was undertaken to test inhibitory effect of extracts from Eichhornia crassipes on the growth of Prorocentrum donghaiense. The concentration of the extracts is indicated by the mass of fresh tissue of E. crassipes in the study. The results showed that the growth of P. donghaiense was strongly inhibited by the aqueous extracts from fresh tissue and dry powder of E. crassipes when concentration was above 2 g·L^-1. When the concentration is 8 g·L^-1, all algae were killed by the extracts from fresh tissue in four days and from dry power in five days. The inhibitory effect was not apparently reduced after extract from fresh tissue was autoclaved for 20 minutes at 121℃. These studies have shown that the algaecide chemicals of E. crassipes were in the tissue of the plant, they might be a potential candidate for HAB control.