| Marine diatom Thalassirosira weissflogii nutrient drawdown and its physiological status variation challenged to zinc and cadmium exposure |
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| 作者姓名： | LI Chundi LONG Aimin YAN Wen MA Fujun CHEN Shaoyong |
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| 作者单位： | LI Chundi1，3，LONG Aimin2，YAN Wen1，MA Fujun2，3，CHEN Shaoyong21.Key Laboratory of Marginal Sea Geology，South China Sea Institute of Oceanology，Chinese Academy of Sciences，Guangzhou 510301，China2.Key Laboratory of Tropical Marine Environmental Dynamics，South China Sea Institute of Oceanology，Chinese Academy of Sciences，Guangzhou 510301，China3.Graduate School，Chinese Academy of Sciences，Beijing 100039，China |
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| 基金项目： | 国家自然科学基金
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广东省科技计划
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中国科学院知识创新工程项目 |
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| 摘 要： | The uptake of zinc and cadmium by a species of marine diatom Thalassirosira weissflogii and the nutrient variation (phosphorus and silicon) in the culture medium were estimated when exposed to zinc and cadmium stress under controlled laboratory conditions.It was found that low cadmium addition could stimulate the culture to grow with a relatively high rate and exert its toxicity at the elevated concentration.The cellular uptake of zinc and cadmium by the diatom varied in the ranges of 1.21~3.75 and 0.060~0.629 fmol per cell respectively in the whole cultivation period.The mean cellular phosphorus and silicon drawdowns were constant with 0.26~0.42 and 0.30~0.46 pmol per cell respectively in those healthy cultures.It is illustrated that the algal cells can adjust some physiological mechanisms to decrease metal accumulation and keep metal homeostasis in the organism.The correlation analysis results further indicate that the cellular cadmium uptake might be closely related with the cellular phosphorus, silicon drawdown and the growth rate of diatom (P<0.05, 0.001, 0.01); and the cultures grow better in good conditions, the lower amount of phosphorus, silicon materials are consumed by a single cell to keep a high efficiency of utilization.
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| 关 键 词： | 硅藻 海水污染 锌 镉 联合毒性 |
| 收稿时间： | 2006-08-07 |
| 修稿时间： | 2007-03-15 |
Marine diatom Thalassirosira weissflogii nutrient drawdown and its physiological status variation challenged to zinc and cadmium exposure |
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| LI Chundi,LONG Aimin,YAN Wen,MA Fujun,CHEN Shaoyong.Marine diatom Thalassirosira weissflogii nutrient drawdown and its physiological status variation challenged to zinc and cadmium exposure[J].Acta Oceanologica Sinica,2007,26(6):51-61. |
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| Authors: | LI Chundi LONG Aimin YAN Wen MA Fujun and CHEN Shaoyong |
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| Institution: | Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;Graduate School, Chinese Academy of Sciences, Beijing 100039, China;Key Laboratory of Tropical Marine Environmental Dynamics, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;Key Laboratory of Tropical Marine Environmental Dynamics, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;Graduate School, Chinese Academy of Sciences, Beijing 100039, China;Key Laboratory of Tropical Marine Environmental Dynamics, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China |
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| Abstract: | The uptake of zinc and cadmium by a species of marine diatom Thalassirosira weissflogii and the nutrient variation (phosphorus and silicon) in the culture medium were estimated when exposed to zinc and cadmium stress under controlled laboratory conditions.It was found that low cadmium addition could stimulate the culture to grow with a relatively high rate and exert its toxicity at the elevated concentration.The cellular uptake of zinc and cadmium by the diatom varied in the ranges of 1.21~3.75 and 0.060~0.629 fmol per cell respectively in the whole cultivation period.The mean cellular phosphorus and silicon drawdowns were constant with 0.26~0.42 and 0.30~0.46 pmol per cell respectively in those healthy cultures.It is illustrated that the algal cells can adjust some physiological mechanisms to decrease metal accumulation and keep metal homeostasis in the organism.The correlation analysis results further indicate that the cellular cadmium uptake might be closely related with the cellular phosphorus, silicon drawdown and the growth rate of diatom (P<0.05, 0.001, 0.01); and the cultures grow better in good conditions, the lower amount of phosphorus, silicon materials are consumed by a single cell to keep a high efficiency of utilization. |
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| Keywords: | zinc cadmium diatom replacement phosphate silicate |
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