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Iodine balance, growth and biochemical composition of three marine microalgae cultured under various inorganic iodine concentrations

机译：不同无机碘浓度下培养的三种海洋微藻的碘平衡，生长和生化组成

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Marine phytoplankton have been found to be involved in the biogeochemical cycle of iodine in the ocean. However, the role of iodine in the metabolism of marine microalgae has hardly been studied and whether iodine is an element required for growth is not known. In this study, three species of marine microalgae were grown in batch cultures at various concentrations of iodide (I-) or iodate (IO3-) in order to evaluate their effect on growth rate and biochemical composition. Changes in inorganic iodine concentrations in the culture medium were also determined. Growth rate was not affected by external inorganic iodine concentration in cultures of Dunaliella salina and Tisochrysis lutea. In cultures of Phaeodactylum tricornutum, growth was inhibited at 2500 mu M IO3-. No clear effects of I- or IO3- were observed on biochemical composition, except for the particulate iodine content of the microalgae, which increased with increasing dissolved iodine concentration. Results of dissolved inorganic iodine measurements indicated that IO3- was reduced to I- during the exponential growth phase of microalgae cultures, under both natural and higher IO3- concentrations. Iodine balance calculations showed that the amount of disappeared IO3- was higher than the amount of I- produced in several cultures and that this discrepancy could not be explained by the formation of particulate iodine. I incorporation rates into biomass were low compared to I- production rates. We conclude that although iodine is clearly taken up from the external medium and it is transformed by microalgae, it seems unlikely that it is an element required for growth or that it plays an essential role in microalgal metabolism.
机译：已发现海洋浮游植物与海洋中碘的生物地球化学循环有关。但是，几乎没有研究碘在海洋微藻的代谢中的作用，还不清楚碘是否是生长所需的元素。在这项研究中，三种批次的海洋微藻以不同浓度的碘化物（I-）或碘酸盐（IO3-）进行分批培养，以评估它们对生长速率和生化成分的影响。还确定了培养基中无机碘浓度的变化。在杜氏盐藻和黄褐线虫的培养物中，生长速率不受外部无机碘浓度的影响。在Tricornutumycorn tricornutum的培养物中，生长在2500μM IO3-处被抑制。除了微藻中的碘含量随溶解碘浓度的增加而增加外，未观察到I-或IO3-对生化成分有明显影响。溶解的无机碘测量结果表明，在天然和较高的IO3-浓度下，IO3-在微藻培养物的指数生长期均被还原为I-。碘平衡计算表明，消失的IO3-的量高于几种培养物中产生的I-的量，这种差异不能通过碘的形成来解释。与I产生率相比，I进入生物质的比率低。我们得出的结论是，尽管碘显然是从外部介质中吸收并通过微藻转化的，但它似乎不是增长所必需的元素，也不可能在微藻代谢中起重要作用。

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  • 来源
    《Marine biology》 |2016年第5期|107.1-107.19|共19页
  • 作者

    van Bergeijk Stef A.; Hernandez Laura; Zubia Eva; Pedro Canavate Jose;

  • 作者单位

    IFAPA Ctr El Toruno, Camino Tiro Pichon S-N, El Puerto De Santa Maria 11500, Spain;

    IFAPA Ctr El Toruno, Camino Tiro Pichon S-N, El Puerto De Santa Maria 11500, Spain;

    Univ Cadiz, Fac Ciencias Mar & Ambientales, Dept Quim Organ, Cadiz 11510, Spain;

    IFAPA Ctr El Toruno, Camino Tiro Pichon S-N, El Puerto De Santa Maria 11500, Spain;

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