【摘要】 采用不同浓度Zn2+处理坛紫菜叶状体,用紫外分光光度法,测定了光合色素的含量。研究了金属Zn2+对坛紫菜叶状体中光合色素:叶绿素a、藻红蛋白、藻蓝蛋白和别藻蓝蛋白的影响。结果表明:Zn2+在0.5~5.0μmol/L时,有利于光合色素的合成;但在5μmol/L时,叶绿素a含量开始下降,在Zn2+浓度>10μmol/L时各光合色素含量也随浓度的升高而下降,对光合色素产生毒害作用。除去Zn2+后,都表现出向对照组恢复靠近的趋势,但别藻蓝蛋白的恢复较慢。更多还原

【Abstract】 Porphyra haitanensis thalli were treated with Zn²⁺ at different concentrations,with its photosynthetic pigment content determined by ultraviolet spectrophotometry.The effects of Zn²⁺ on the photosynthetic pigments,including chlorophyll a,phycoerythrin,phycocyanin and allophycocyanin of P.haitanensis thalli,were studied.The results show that Zn²⁺ promotes pigment synthesis in 0.5～5.0 μmol/L.The chlorophyll a content of begins to decrease markedly when the Zn²⁺ concentration of reaches 5 μmol/L.The photosynthetic pigment contents decrease with the increase of Zn²⁺ concentration when the Zn²⁺ concentration is higher than 10 μmol/L,toxicity damage being produced to the photosynthetic pigments.After the cease of Zn²⁺ treatment,all photosynthetic pigment contents show a trend to regress to that of the control.However,the recovery of allophycocyanin is slower than other photosynthetic pigments.更多还原