期刊
CHEMOSPHERE
卷 82, 期 7, 页码 963-969出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2010.10.079
关键词
As; Bioaccumulation; Cell membrane damage; Photosynthesis; ROS
The aim of this study was to test in a short term laboratory experiment the accumulation and physiological effects of As in the epiphytic lichen Xanthoria parietina. Arsenic content in treated samples increased progressively with increasing concentration in treatment solutions. Treatment of X. parietina thalli with 0.1, 1, 10 ppm As solutions caused significant decrease of viability, measured as intensity of respiratory activity, and damages to cell membranes, assessed by increase of electric conductivity of rinsing water and lipid peroxidation products. Soluble proteins content decreased and H2O2 content increased already at the lowest As concentration tested (0.01 ppm). Photosynthetic efficiency, measured in terms of F-V/F-M ratio, decreased significantly only at the highest As concentration (10 ppm). It was concluded that As exposure causes physiological stress both on the mycobiont and the photobiont and that cell membrane damage, expressed in terms of electric conductivity of rinsing water, is the parameter most affected by As treatment. (C) 2010 Elsevier Ltd. All rights reserved.
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