小珊瑚藻对赤潮异弯藻的克生效应及其 对UV-B辐射增强的响应

通过共培养方法，以细胞密度为主要测定指标，研究了小珊瑚藻对赤潮异弯藻的克生效应及其对UV-B辐射增强的响应.结果表明：小珊瑚藻的新鲜组织和水溶性抽提液对赤潮异弯藻的生长表现出显著的抑制作用(P＜0.05)，说明小珊瑚藻对赤潮异弯藻具有克生效应；而小珊瑚藻干粉末和培养水过滤液对赤潮异弯藻生长则无明显影响(P>0.05).将小珊瑚藻用不同剂量的UV-B辐射预处理后，再与赤潮异弯藻共培养，除培养水过滤液外，其新鲜组织、干粉末和水溶性抽提液对赤潮异弯藻生长的作用效果均有所改变，高剂量(3.0 J·m^-2)UV-B辐射使小珊瑚藻对赤潮异弯藻的抑制作用减弱(P＜0.05)，而低剂量(0.9 J·m^-2) UV-B辐射则使抑制作用增强(P＜0.05).

Allelopathic effect of Corallina pilulifera on Heterosigma akashiwo and its responses to UV-B irradiation

By the method of co-culture and using cell density as the main indicator, this paper studied the allelopathic effect of Corallina pilulifera on
Heterosigma akashiwo and its responses to UV-B irradiation. Under normal condition, the fresh tissue and aqueous extracts of C. pilulifera had significant inhibitory effects on the growth of H. akashiwo (P<0.05), indicating their allopathic effect on H. akashiwo, while the dry power and culture media filtrate of C. pilulifera had less effect (P>0.05). After pre-treated with different dose UV-B radiation and then co-cultured with H. akashiwo, C. pilulifera had some changes in the allelopathic activity of its fresh tissue, dry powder, and aqueous extracts. High-dose UV-B radiation (3.0 J·m^-2) induced the decrease of the allelopathic effect, whereas low-dose UV-B radiation (0.9 J·m^-2) was in adverse (P<0.05).