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首页> 外文期刊>Frontiers in Microbiology >Phosphorus Deficiency Inhibits Cell Division But Not Growth in the Dinoflagellate Amphidinium carterae
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Phosphorus Deficiency Inhibits Cell Division But Not Growth in the Dinoflagellate Amphidinium carterae

机译：缺磷会抑制铁鞭毛纲中的细胞分裂，但不能抑制其生长。

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Phosphorus (P) is an essential nutrient element for the growth of phytoplankton. How P deficiency affects population growth and the cell division cycle in dinoflagellates has only been studied in some species, and how it affects photosynthesis and cell growth remains poorly understood. In the present study, we investigated the impact of P deficiency on the cell division cycle, the abundance of the carbon-fixing enzyme Rubisco, and other cellular characteristics in the Gymnodiniales peridinin-plastid species Amphidinium carterae . We found that under P-replete condition, the cell cycle actively progressed in the culture in a 24-h diel cycle with daily growth rates markedly higher than the P-deficient cultures, in which cells were arrested in the G1 phase and cell size significantly enlarged. The results suggest that, as in previously studied dinoflagellates, P deficiency likely disenables A. carterae to complete DNA duplication or check-point protein phosphorylation. We further found that under P-deficient condition, overall photosystem II quantum efficiency ( F v/ F m ratio) and Rubisco abundance decreased but not significantly, while cellular contents of carbon, nitrogen, and proteins increased significantly. These observations indicated that under P-deficiency, this dinoflagellate was able to continue photosynthesis and carbon fixation, such that proteins and photosynthetically fixed carbon could accumulate resulting in continued cell growth in the absence of division. This is likely an adaptive strategy thereby P-limited cells can be ready to resume the cell division cycle upon resupply of phosphorus.
机译：磷（P）是浮游植物生长必需的营养元素。仅在某些物种中研究了磷缺乏症如何影响种群的生长和鞭毛藻的细胞分裂周期，而磷缺乏症如何影响光合作用和细胞生长仍知之甚少。在本研究中，我们研究了磷缺乏对裸子草裸素-质体类软骨两性菌细胞分裂周期，固碳酶Rubisco丰度以及其他细胞特性的影响。我们发现，在P充足的条件下，细胞周期在培养过程中以24小时diel周期活跃地进行，日生长速率明显高于P不足的培养，后者的细胞停留在G1期，细胞大小显着增加放大。结果表明，与以前研究的鞭毛藻一样，磷缺乏症可能会使炭疽曲霉无法完成DNA复制或检查点蛋白磷酸化。我们进一步发现，在P缺乏的条件下，整个光系统II的量子效率（Fv / Fm比）和Rubisco丰度下降但不明显，而细胞中碳，氮和蛋白质的含量显着增加。这些观察结果表明，在磷缺乏的情况下，这种鞭毛鞭毛藻能够继续光合作用和碳固定，从而蛋白质和光合固定碳会积累，导致细胞在不分裂的情况下持续生长。这可能是一种自适应策略，因此P受限的细胞可以在磷重新供应后准备好恢复细胞分裂周期。

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