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Quantitative Relationship between Cadmium Uptake and the Kinetics of Phytochelatin Induction by Cadmium in a Marine Diatom
Wu, Yun; Guo, Zhiqiang; Zhang, Wei; Tan, Qiaoguo; Zhang, Li; Ge, Xinlei; Chen, Mindong; Zhang, L (reprint author), Chinese Acad Sci, South China Sea Inst Oceanol, Guangdong Prov Key Lab Appl Marine Biol, Key Lab Trop Marine Bioresources & Ecol, Guangzhou 510301, Guangdong, Peoples R China.
2016
Source PublicationSCIENTIFIC REPORTS
Volume6Pages:35935
AbstractHeavy metals activate the synthesis of phytochelatins (PCs), while the induced PCs might affect metal uptake via chelating intracellular free metals. However, the relationship of PCs to metal uptake is poorly understood. In this study, we examined the kinetics of cadmium (Cd) accumulation and the synthesis of PCs in a marine diatom, Thalassiosira weissflogii, under different irradiance levels. Irradiance alone could not change the concentrations of PCs in the Cd-free treatments, while higher irradiance accelerated the induction of intracellular PCs at the same [Cd2+] level. PC-SH (2 x PC2 + 3 x PC3 + 4 x PC4) was bound with Cd at a stoichiometric ratio of 2 to 49 in our short-term uptake experiments, indicating that PC induction is sufficient to serve as the first line of defense against Cd stress. A positive linear correlation between the induction rate of PCs and the Cd uptake rate was observed, while the ratio of the PC content to intracellular Cd varied greatly when the irradiance was increased several fold. Because metal uptake has been successfully used in predicting acute metal toxicity, our findings are helpful for understanding the role of PCs in metal detoxification and developing PCs as biomarkers for metal sensitivity.
Department[Wu, Yun; Ge, Xinlei; Chen, Mindong] NUIST, Jiangsu Collaborat Innovat Ctr Atmospher Environm, Jiangsu Key Lab Atmospher Environm Monitoring & P, Sch Environm Sci & Engn,Jiangsu Engn Technol Res, Nanjing 210044, Jiangsu, Peoples R China; [Wu, Yun; Guo, Zhiqiang; Zhang, Wei; Zhang, Li] Chinese Acad Sci, South China Sea Inst Oceanol, Guangdong Prov Key Lab Appl Marine Biol, Key Lab Trop Marine Bioresources & Ecol, Guangzhou 510301, Guangdong, Peoples R China; [Tan, Qiaoguo] Xiamen Univ, Coll Environm & Ecol, Xiamen 361102, Peoples R China ; LMB
Subject AreaScience & Technology - Other Topics
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/15272
Collection中科院海洋生物资源可持续利用重点实验室
Corresponding AuthorZhang, L (reprint author), Chinese Acad Sci, South China Sea Inst Oceanol, Guangdong Prov Key Lab Appl Marine Biol, Key Lab Trop Marine Bioresources & Ecol, Guangzhou 510301, Guangdong, Peoples R China.
Recommended Citation
GB/T 7714
Wu, Yun,Guo, Zhiqiang,Zhang, Wei,et al. Quantitative Relationship between Cadmium Uptake and the Kinetics of Phytochelatin Induction by Cadmium in a Marine Diatom[J]. SCIENTIFIC REPORTS,2016,6:35935.
APA Wu, Yun.,Guo, Zhiqiang.,Zhang, Wei.,Tan, Qiaoguo.,Zhang, Li.,...&Zhang, L .(2016).Quantitative Relationship between Cadmium Uptake and the Kinetics of Phytochelatin Induction by Cadmium in a Marine Diatom.SCIENTIFIC REPORTS,6,35935.
MLA Wu, Yun,et al."Quantitative Relationship between Cadmium Uptake and the Kinetics of Phytochelatin Induction by Cadmium in a Marine Diatom".SCIENTIFIC REPORTS 6(2016):35935.
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