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Physiological response of Synechocystis sp. to cadmium stress during calcification

摘要：为了研究在藻体钙化情况下Cd对集胞藻的胁迫作用,采用实验室模拟方法,通过不同浓度Ca²⁺、Cd²⁺配比下培养基中生物量、光合溶解氧、叶绿素等一系列生理指标的变化来反映钙化条件下Cd²⁺对集胞藻细胞的胁迫程度.结果显示,钙离子的存在能够使Cd²⁺对藻细胞的毒害作用减小并保护其受到进一步损害;二因素影响下交互试验,发现Ca²⁺、Cd²⁺分别与生物量呈现明显的负相关(|FCa₂₊|>F_0.05,|FCd₂₊|>F_0.05),两者的交互作用与其呈显著正相关(FCd₂₊×Ca₂₊>F_0.05).SEM和EDS观察到钙化层的产生.这说明重金属Cd对藻体胁迫压力的减小是由于钙化层的保护作用.

Abstract：In order to investigate the stress effects of Cd on Synechocystis sp.during calcification,a simulation was carried out and a series of physiological indexes were measured.Biomass,dissolved oxygen produced by photosynthesis and chlorophyll quantity were measured to reflect the extent of Cd²⁺ stress on calcified Synechocystis sp.The results showed that Ca²⁺ could decrease the toxicity of Cd²⁺ to Synechocystis sp.and protect the cyanobacteria from further damage.There was an obvious negative correlation between the concentrations of the two ions and biomass(|FCa₂₊|>F_0.05,|FCd₂₊|>F_0.05) while interaction between Ca²⁺ and Cd²⁺ revealed a markedly positive correlation(FCd₂₊ Ca₂₊ > F_0.05).Calcified layers were observed using SEM and EDS analysis,so the decrease of Cd stress could be attributed to the protection afforded by the calcified layers.