The effect of elevated pCO(2) on cadmium resistance of a globally important diatom

文献类型： 外文期刊

第一作者： Zhang, Xiansheng

作者： Zhang, Xiansheng;Xu, Dong;Huang, Shujie;Han, Wentao;Zhang, Yan;Fan, Xiao;Zhang, Xiaowen;Wang, Yitao;Wang, Wei;Ye, Naihao;Xu, Dong;Ye, Naihao;Wang, Shaohua;Liang, Chengwei;Li, Fang;Egan, Suhelen;Saha, Mahasweta

作者机构：

关键词： Ocean acidification (OA); Phaeodactyium tricornutum; Cd toxicity; Heavy metal toxicity; Heavy metal resistance

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：10.588； 五年影响因子：10.129 ）

ISSN： 0304-3894

年卷期： 2020 年 396 卷

页码：

收录情况： SCI

摘要： Cadmium (Cd) pollution is a widespread threat to marine life, and ongoing ocean acidification (OA) is predicted to impact bio-toxicity of Cd compounds. However, the cascading effects of changed Cd toxicity to marine primary producers are not well characterized. Here, we studied the impact of OA on Cd toxicity responses in a globally important diatom Phaeodactylum tricornutum under both ambient and elevated pCO(2) conditions. We found that increased pCO(2) alleviated the impact of additive Cd toxicity on P. tricornutum not only under controlled indoor experiments but also in outdoor mesocosm experiments that reflect more natural growth conditions. Transcriptome analysis suggested that genes involved in Cd efflux and phytochelatin production were up-regulated and genes involved in Cd influx were down-regulated in long-term selected lineages under elevated pCO(2). We further found a significant reduction of Cd transfer across trophic level, when the scallop Argopecten irradians was fed with Cd-exposed P. tricornutum previously cultured under elevated pCO(2). Our results indicate that after long-term selection of P. tricornutum exposed to future OA conditions (i.e. elevated pCO(2)), the diatom alters its Cd detoxification strategy, which could have broader impacts on the bio-geochemical cycle of Cd in the marine ecosystem.

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