| LI Chundi,LONG Aimin,YAN Wen,MA Fujun,CHEN Shaoyong. 2007. Marine diatom Thalassirosira weissflogii nutrient drawdown and its physiological status variation challenged to zinc and cadmium exposure. Acta Oceanologica Sinica, (6):51－61 |
| Marine diatom Thalassirosira weissflogii nutrient drawdown and its physiological status variation challenged to zinc and cadmium exposure |
| Marine diatom Thalassirosira weissflogii nutrient drawdown and its physiological status variation challenged to zinc and cadmium exposure |
| Received:August 07, 2006 Revised:March 15, 2007 |
| DOI： |
| Key words:zinc cadmium diatom replacement phosphate silicate |
| 中文关键词: zinc cadmium diatom replacement phosphate silicate |
| 基金项目: |
| Author Name | Affiliation | E-mail | | LI Chundi | 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 | | | LONG Aimin | Key Laboratory of Tropical Marine Environmental Dynamics, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China | longam@scsio.ac.cn | | YAN Wen | Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China | | | MA Fujun | 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 | | | CHEN Shaoyong | 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. |
| 中文摘要: |
| 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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