| 摘要: |
| 采用实验生态学的方法, 研究了大型海藻鼠尾藻(Sargassum thunbergii)对赤潮微藻中肋骨条藻(Skeletonema costatum)的克生效应及其对CO2加富的响应变化。结果表明, 正常培养的鼠尾藻新鲜组织、干粉末和水溶性抽提液能够导致中肋骨条藻的细胞密度显著降低 (P<0.05), CO2加富培养的鼠尾藻新鲜组织、干粉末和水溶性抽提液能够更加明显地抑制中肋骨条藻种群生长(P<0.01)。实验结果证实鼠尾藻对中肋骨条藻具有克生效应, 而CO2加富培养引起了鼠尾藻对中肋骨条藻克生效应的变化, 使其对中肋骨条藻生长的抑制作用显著加强。正常培养的鼠尾藻培养水过滤液能够显著抑制中肋骨条藻的生长(P<0.05), 而CO2加富培养的鼠尾藻培养水过滤液对中肋骨条藻的生长没有表现出明显的影响(P>0.05), 因此推测CO2加富培养可能改变了鼠尾藻对中肋骨条藻克生作用的方式, 作用方式由分泌克生物质转变为细胞直接接触转递。 |
| 关键词: 鼠尾藻(Sargassum thunbergii) 中肋骨条藻(Skeletonema costatum) 克生效应 CO2加富 |
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| 基金项目:高等学校博士学科点专项科研基金新教师类资助课题(2011013220025); 高等学校基本科研业务费青年教师科研专项基金(201213007) |
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| Influence of CO2 enrichment on the allelopathic effect of Sargassum thunbergii on Skeletonema costatum |
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| Abstract: |
| The allelopathic effect of Sargassum thunbergii on Skeletonema costatum and its response to CO2 enrichment were investigated by an experimental ecology method. Results showed that, under normal conditions, fresh tissue, dry power and aqueous extracts of S. thunbergii resulted in remarkably reductions in cell density of S. costatum (P<0.05). In addition, the fresh tissue, dry power and aqueous extracts of S. thunbergii, which were cultured under CO2 enrichment conditions, led to more significant decreases in cell density of S. costatum (P<0.01). Under normal conditions, the culture media filtrate of S. thunbergii drastically inhibited the growth of S. costatum (P<0.05), while that of S. thunbergii which were cultured under CO2 enrichment conditions did not exhibit significantly inhibitive effect on S. costatum (P>0.05). Therefore, it was speculated that the mediating mechanism of the allelopathic effect might be changed by CO2 enrichment, from the secreted allelopathic substances to direct cell contact. |
| Key words: Sargassum thunbergii Skeletonema costatum Allelopathic Effects CO2 enrichment |
