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首页> 外文期刊>Chinese Journal of Oceanology and Limnology >Photosynthetic efficiency, cell volume, and elemental stoichiometric ratios in Thalassirosira weissflogii under phosphorus limitation
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Photosynthetic efficiency, cell volume, and elemental stoichiometric ratios in Thalassirosira weissflogii under phosphorus limitation

机译：磷限制条件下拟南芥的光合作用效率，细胞体积和元素化学计量比

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摘要

Nutrient limitation is known to inhibit growth and metabolism and to alter elemental stoichiometric ratios in phytoplankton. In this study, physiological changes in Thalassirosira weissflogii were measured under different dissolved inorganic phosphate (DIP) regimes in semi-continuous cultures to revisit the utility of the Redfield ratio for assessing nutrient limitation. The results showed that cell size increased with decreasing DIP availability. In the P-depleted treatment (f/2-P) the cell size was 1.48 times larger than that in the P-limited (f/100) treatment and 2.67 times larger than that in the P-saturated treatment (f/2 and f/10). The fucoxanthin to chlorophyll a ratio (Fuco/chl a) was relatively stable (about 0.3) in P-saturated cultures and was 10 times higher than that in P-limited and P-depleted cultures. During the experimental period, the photosynthetic efficiency index, ΔF/F m ′, was relatively stable at ∼0.50 in the P-saturated cultures, but quickly declined with decreasing DIP availability. Although cellular P content showed a significant difference between the P-saturated culture (1.6 pg/cell) and the P-limited culture (0.7 pg/cell), the N/P ratio in T. weissflogii did not show a trend with DIP availability and fluctuated slightly around 25. Our results suggest that cell division in T. weissflogii is not strictly size-gated but is probably regulated by a biochemical, and hence, an elemental stoichiometric ratio threshold, and that deviation of the cellular N/P ratio from the Redfield ratio is not a reliable indicator of algal nutrient stress.
机译：已知营养限制会抑制浮游植物的生长和代谢，并改变其元素化学计量比。在这项研究中，在半连续培养条件下，在不同的可溶性无机磷酸盐（DIP）体制下测量了Thalassirosira weissflogii的生理变化，以重新利用Redfield比率来评估营养限制。结果表明，随着DIP可用性的降低，单元尺寸增大。贫P处理（f / 2-P）的细胞大小是P受限（f / 100）处理的1.48倍，P饱和处理（f / 2和P）的2.67倍f / 10）。在磷饱和的培养物中，岩藻黄质与叶绿素a的比率（Fuco / chla）相对稳定（约0.3），比限磷和贫磷培养物中的高。在实验期间，在P饱和培养物中，光合效率指数ΔF/ F m '相对稳定在约0.50，但随着DIP利用率的降低而迅速下降。尽管细胞中的P含量在P饱和培养物（1.6 pg /细胞）和P受限培养物（0.7 pg /细胞）之间显示出显着差异，但T. weissflogii中的N / P比没有显示DIP可用性的趋势并在25附近略有波动。我们的结果表明，魏氏梭菌的细胞分裂并非严格按照大小控制，而是可能受生化调节，因此受元素化学计量比阈值的控制，并且细胞N / P比与Redfield比率不是藻类营养胁迫的可靠指标。

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  • 来源
    《Chinese Journal of Oceanology and Limnology》 |2011年第5期|p.1048-1056|共9页
  • 作者

    Sheng Liu 刘胜; Zhiling Guo 郭志灵; Tao Li 李涛; Hui Huang 黄晖; Senjie Lin 林森杰;

  • 作者单位

    Key Laboratory of Marine Bio-resources Sustainable Utilization, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China;

    Key Laboratory of Marine Bio-resources Sustainable Utilization, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China;

    Key Laboratory of Marine Bio-resources Sustainable Utilization, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China;

    Key Laboratory of Marine Bio-resources Sustainable Utilization, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China;

    Key Laboratory of Marine Bio-resources Sustainable Utilization, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China;

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  • 正文语种 eng
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  • 关键词

    phosphorus; diatom; physiological responses; PAM; elemental ratio;

    机译：磷;硅藻;生理反应;PAM;元素比;

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