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首页> 外文期刊>Journal of phycology >Uncoupling of silicon compared with carbon and nitrogen metabolisms and the role of the cell cycle in continuous cultures of Thalassiosira pseudonana (Bacillariophyceae) under light, nitrogen, and phosphorus control
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Uncoupling of silicon compared with carbon and nitrogen metabolisms and the role of the cell cycle in continuous cultures of Thalassiosira pseudonana (Bacillariophyceae) under light, nitrogen, and phosphorus control

机译：在光，氮和磷的控制下，硅的解偶联与碳和氮代谢的关系以及细胞周期在拟南芥（Bacillariophyceae）连续培养中的作用

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The elemental composition and the cell cycle stages of the marine diatom Thalassiosira pseudonana Hasle and Heimdal were studied in continuous cultures over a range of different light- (E), nitrogen( N), and phosphorus- (P) limited growth rates. In all growth conditions investigated, the decrease in the growth rate was linked with a higher relative contribution of the G2+ M phase. The other phases of the cell cycle, G1 and S, showed different patterns, depending on the type of limitation. All experiments showed a highly significant increase in the amount of biogenic silica per cell and per cell surface with decreasing growth rates. At low growth rates, the G2+ M elongation allowed an increase of the silicification of the cells. This pattern could be explained by the major uptake of silicon during the G2+ M phase and by the independence of this process on the requirements of the other elements. This was illustrated by the elemental ratios Si/C and Si/N that increased from 2- to 6-fold, depending of the type of limitation, whereas the C/N ratio decreased by 10% (E limitation) or increased by 50% (P limitation). The variations of the ratios clearly demonstrate the uncoupling of the Si metabolism compared with the C and N metabolisms. This uncoupling enabled us to explain that in any of the growth condition investigated, the silicification of the cells increased at low growth rates, whereas carbon and nitrogen cellular content are differently regulated, depending of the growth conditions.
机译：在不同的光（E），氮（N）和磷（P）限制生长速率范围内，在连续培养中研究了海洋硅藻Thalassiosira pseudonana Hasle和Heimdal的元素组成和细胞周期阶段。在研究的所有生长条件下，生长速率的降低与G2 + M相的较高相对贡献有关。细胞周期的其他阶段，G1和S，显示出不同的模式，这取决于限制的类型。所有实验均显示，随着细胞生长速率的降低，每个细胞和每个细胞表面的生物二氧化硅的量均显着增加。在低生长速率下，G2 + M延伸允许细胞硅化的增加。可以通过G2 + M阶段硅的大量吸收以及此过程对其他元素要求的独立性来解释这种模式。这可以通过元素比率Si / C和Si / N从2倍增加到6倍来说明，具体取决于限制的类型，而C / N比率降低10％（E限制）或增加50％ （P限制）。比率的变化清楚地表明与C和N代谢相比，Si代谢的解偶联。这种解偶联使我们能够解释，在所研究的任何生长条件下，细胞的硅化作用均以低生长速率增加，而碳和氮的细胞含量则根据生长条件而受到不同的调节。

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