地衣厚缘梅衣（Hypogymnia physodes (L.) Nyl.）中砷酸盐的吸收与生物转化
Uptake and biotransformation of arsenate in the lichen Hypogymnia physodes (L.) Nyl.
作者信息
Mrak Tanja, Slejkovec Zdenka, Jeran Zvonka, Jaćimović Radojko, Kastelec Damijana
机构信息
Department of Environmental Sciences, Jozef Stefan Institute, Jamova 39, Ljubljana, Slovenia.
出版信息
Environ Pollut. 2008 Jan;151(2):300-7. doi: 10.1016/j.envpol.2007.06.011. Epub 2007 Jul 19.
The uptake and metabolism of arsenate, As(V), as a function of time and concentration were examined in the lichen Hypogymnia physodes (L.) Nyl. Lichen thalli were exposed to As(V) in the form of a solution. Exponential uptake of As(V) from 4 microg mL(-1) As(V) solution was accompanied by constant arsenite, As(III), excretion back into the solution. Arsenate taken up into the lichens from 0, 0.1, 1, 10 microg mL(-1) As(V) solutions was partially transformed into As(III), dimethylarsinic acid (DMA) and (mono)methylarsonic acid (MA). 48 h after exposure, the main arsenic compound in the lichens was DMA in 0.1, As(III) in 1 and As(V) in 10 microg mL(-1) treatment. The proportion of methylated arsenic compounds decreased with increasing arsenate concentration in the exposure solution. These results suggest that at least two types of As(V) detoxification exist in lichens; arsenite excretion and methylation.
研究了地衣淡黄网衣（Hypogymnia physodes (L.) Nyl.）中砷酸盐（As(V)）的吸收和代谢随时间和浓度的变化情况。地衣叶状体暴露于溶液形式的As(V)中。从4 μg mL⁻¹ As(V)溶液中指数吸收As(V)的同时，有恒定的亚砷酸盐（As(III)）排泄回溶液中。从0、0.1、1、10 μg mL⁻¹ As(V)溶液中吸收到地衣中的砷酸盐部分转化为As(III)、二甲基砷酸（DMA）和（单）甲基砷酸（MA）。暴露48小时后，地衣中主要的砷化合物在0.1 μg mL⁻¹处理中是DMA，在1 μg mL⁻¹处理中是As(III)，在10 μg mL⁻¹处理中是As(V)。甲基化砷化合物的比例随着暴露溶液中砷酸盐浓度的增加而降低。这些结果表明地衣中至少存在两种As(V)解毒类型；亚砷酸盐排泄和甲基化。
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