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Acclimation and adaptation to elevated pCO(2) increase arsenic resilience in marine diatoms

文献类型： 外文期刊

作者： Xu, Dong 1 ; Schaum, Charlotte-Elisa 3 ; Li, Bin 4 ; Chen, Yanan 4 ; Tong, Shanying 5 ; Fu, Fei-Xue 6 ; Hutchins, Davi 1 ;

作者机构： 1.Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, Qingdao, Peoples R China

2.Qingdao Natl Lab Marine Sci & Technol, Funct Lab Marine Fisheries Sci & Food Prod Proc, Qingdao, Peoples R China

3.Univ Hamburg, Ctr Earth Syst Sci & Sustainabil CEN, D-22767 Hamburg, Germany

4.Shandong Marine Resource & Environm Res Inst, Shandong Key Lab Marine Ecol Restorat, Yantai 264006, Peoples R China

5.Ludong Univ, Coll Life Sci, Yantai, Peoples R China

6.Univ Southern Calif, Dept Biol Sci, Los Angeles, CA 90007 USA

期刊名称：ISME JOURNAL （ 影响因子：10.302； 五年影响因子：12.284 ）

ISSN： 1751-7362

年卷期：

页码：

收录情况： SCI

摘要： Arsenic pollution is a widespread threat to marine life, but the ongoing rise pCO(2) levels is predicted to decrease bio-toxicity of arsenic. However, the effects of arsenic toxicity on marine primary producers under elevated pCO(2) are not well characterized. Here, we studied the effects of arsenic toxicity in three globally distributed diatom species (Phaeodactylum tricornutum, Thalassiosira pseudonana, and Chaetoceros mulleri) after short-term acclimation (ST, 30 days), medium-term exposure (MT, 750 days), and long-term (LT, 1460 days) selection under ambient (400 mu atm) and elevated (1000 and 2000 mu atm) pCO(2). We found that elevated pCO(2) alleviated arsenic toxicity even after short acclimation times but the magnitude of the response decreased after mid and long-term adaptation. When fed with these elevated pCO(2) selected diatoms, the scallop Patinopecten yessoensis had significantly lower arsenic content (3.26-52.83%). Transcriptomic and biochemical analysis indicated that the diatoms rapidly developed arsenic detoxification strategies, which included upregulation of transporters associated with shuttling harmful compounds out of the cell to reduce arsenic accumulation, and upregulation of proteins involved in synthesizing glutathione (GSH) to chelate intracellular arsenic to reduce arsenic toxicity. Thus, our results will expand our knowledge to fully understand the ecological risk of trace metal pollution under increasing human activity induced ocean acidification.

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