Effects of inorganic arsenic on growth and microcystin production of a <Emphasis Type="Italic">Microcystis</Emphasis> strain isolated from an algal bloom in Dianchi Lake,China |
| |
Authors: | Yan Gong HongYi Ao BiBo Liu Sheng Wen Zhi Wang DingJing Hu XingZhong Zhang LiRong Song JianTong Liu |
| |
Institution: | (1) Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, People’s Republic of China;(2) Agricultural Testing and Information Center, Hubei Academy of Agriculture Science, Wuhan, 430064, People’s Republic of China;(3) Graduate School of the Chinese Academy of Sciences, Beijing, 100039, People’s Republic of China;(4) Institute of Fisheries Science, National Taiwan University, Taipei, 10617 Taiwan, China;(5) Department of Chemistry, National Central University, Taoyuan, 32001 Taiwan, China; |
| |
Abstract: | Our previous data have shown that inorganic arsenic concentrations were high in Dianchi Lake, China, where Microcystis blooms often occur. To explore the relationship between arsenic and the growth of Microcystis, the effects of arsenite As(III)] and arsenate As(V)] on the growth and toxin production of M. aeruginosa strain FACHB 905 were tested. Results showed that M. aeruginosa FACHB 905 was tolerant to inorganic arsenic and its growth was not inhibited when the concentration of As(III) was below
10−5 mol L−1 or that of As(V) below 10−3 mol L−1. Total microcystin production was stimulated in the presence of 10−7 mol L−1 As(III) and the response of this M. aeruginosa strain to As(III) seemed to be a typical inverted U-shaped hormesis. The content increase of microcystin-LR per cell indicated
that the toxicity was enhanced as M. aeruginosa FACHB 905 was exposed to As(V). Considering the relatively high concentration of inorganic arsenic in Dianchi Lake (139 μg
L−1 in epilimnetic water), the origin of the M. aeruginosa strain, inorganic arsenic favors survival of M. aeruginosa FACHB 905 and may stimulate its microcystin production and cellular toxicity. |
| |
Keywords: | inorganic arsenic cyanobacteria Microcystis aeruginosa microcystin |
本文献已被 维普 SpringerLink 等数据库收录! |
|