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首页> 外文期刊>Marine biology >Respiratory oxygen consumption in the seagrass Zostera marina varies on a diel basis and is partly affected by light
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Respiratory oxygen consumption in the seagrass Zostera marina varies on a diel basis and is partly affected by light

机译：海草Zostera码头的呼吸氧气消耗以diel为基础变化，部分受光照影响

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摘要

The seagrass Zostera marina is an important marine ecosystem engineer, greatly influencing oxygen and carbon fluctuations in temperate coastal areas. Although photosynthetically driven gas fluxes are well studied, the impact of the plant's mitochondrial respiration on overall -CO2 and -O-2 fluxes in marine vegetated areas is not yet understood. Likewise, the gene expression in relation to the respiratory pathway has not been well analyzed in seagrasses. This study uses a combined approach, studying respiratory oxygen consumption rates in darkness simultaneously with changes in gene expression, with the aim of examining how respiratory oxygen consumption fluctuates on a diel basis. Measurements were first made in a field study where samples were taken directly from the ocean to the laboratory for estimations of respiratory rates. This was followed by a laboratory study where measurements of respiration and expression of genes known to be involved in mitochondrial respiration were conducted for 5 days under light conditions mimicking natural summer light (i.e.,15 h of light and 9 h of darkness), followed by 3 days of constant darkness to detect the presence of a potential circadian clock. In the field study, there was a clear diel variation in respiratory oxygen consumption with the highest rates in the late evening and at night (0.766 and 0.869 mu mol -O-2 m(-2) s(-1), respectively). These repetitive diel patterns were not seen in the laboratory, where water conditions (temperature, pH, and oxygen) showed minor fluctuations and only light varied. The gene expression analysis did not give clear evidence on drivers behind the respiratory fluxes; however, expression levels of the selected genes generally increased when the seagrass was kept in constant darkness. While light may influence mitochondrial respiratory fluxes, it appears that other environmental factors (e.g., temperature, pH, or oxygen) could be of significance too. As seagrasses substantially alter the proportions of both oxygen and inorganic carbon in the water column and respiration is a great driver of these alterations, we propose that acknowledging the presence of respiratory fluctuations in nature should be considered when estimating coastal carbon budgets. As dark respiration in field at midnight was approximately doubled from that of midday, great over-, or underestimations of the respiratory carbon dioxide release from seagrasses could be made if values are just obtained at one specific time point and considered constant.
机译：海草Zostera码头是重要的海洋生态系统工程师，对温带沿海地区的氧气和碳波动有很大影响。尽管对光合作用驱动的气体通量进行了很好的研究，但植物的线粒体呼吸对海洋植被区中总体-CO2和-O-2通量的影响尚不清楚。同样，在海草中尚未很好地分析与呼吸途径有关的基因表达。这项研究采用组合方法，研究黑暗中的呼吸氧气消耗率以及基因表达的变化，目的是检查呼吸氧气消耗如何以diel为基础波动。首先在现场研究中进行测量，在该研究中，样品直接从海洋采集到实验室以估计呼吸频率。随后进行了一项实验室研究，其中在模拟自然夏季光的光照条件下（即15h的光照和9h的黑暗），对呼吸和已知与线粒体呼吸有关的基因的表达进行了5天的测量。 3天持续黑暗，以检测是否存在潜在的昼夜节律时钟。在野外研究中，呼吸氧气消耗存在明显的diel变化，在深夜和夜间发生率最高（分别为0.766和0.869 mu mol -O-2 m（-2）s（-1））。在水的条件（温度，pH和氧气）显示出较小的波动且只有光线变化的实验室中，这些重复的diel模式没有出现。基因表达分析没有提供关于呼吸通量背后驱动因素的明确证据。然而，当海草处于持续黑暗中时，所选基因的表达水平通常会提高。尽管光可能影响线粒体呼吸通量，但其他环境因素（例如温度，pH或氧气）似乎也可能具有重要意义。由于海草极大地改变了水柱中氧气和无机碳的比例，并且呼吸是这些变化的重要驱动力，因此我们建议在估算沿海碳预算时应考虑到自然界中存在呼吸波动。由于午夜的田间暗呼吸比午时的暗呼吸大约增加了一倍，因此，如果仅在一个特定的时间点获得值并将其视为恒定值，则可能会大大高估或低估海草释放的呼吸二氧化碳。

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  • 来源
    《Marine biology》 |2017年第6期|140.1-140.12|共12页
  • 作者

    Rasmusson Lina M.; Lauritano Chiara; Procaccini Gabriele; Gullstrom Martin; Buapet Pimchanok; Bjork Mats;

  • 作者单位

    Stockholm Univ, Dept Ecol Environm & Plant Sci, Seagrass Ecol & Physiol Res Grp, SE-10691 Stockholm, Sweden;

    Villa Comunale, Dept Integrat Marine Ecol, Stn Zool Anton Dohrn, I-80121 Naples, Italy;

    Villa Comunale, Dept Integrat Marine Ecol, Stn Zool Anton Dohrn, I-80121 Naples, Italy;

    Stockholm Univ, Dept Ecol Environm & Plant Sci, Seagrass Ecol & Physiol Res Grp, SE-10691 Stockholm, Sweden;

    Stockholm Univ, Dept Ecol Environm & Plant Sci, Seagrass Ecol & Physiol Res Grp, SE-10691 Stockholm, Sweden|Prince Songkla Univ, Dept Biol, Fac Sci, Hat Yai 90112, Songkhla, Thailand;

    Stockholm Univ, Dept Ecol Environm & Plant Sci, Seagrass Ecol & Physiol Res Grp, SE-10691 Stockholm, Sweden;

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