Light and brominating activity in two species of marine diatom
Light and brominating activity in two species of marine diatom
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两种海洋硅藻的光和溴化活性
DOI：
10.1016/j.marchem.2016.02.003
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发表时间：
2016
期刊：
影响因子：
3
通讯作者：
Hughes C
中科院分区：
文献类型：
--
作者：
Hughes C
海洋生物介导挥发性无机卤素（如HOBr）和有机卤素（如CHBr 3）的形成，并促使溴和碘从海洋排放到空气中。这种海-气卤素交换对大气化学有影响。重要的是要建立卤素代谢的生理功能，在关键群体的海洋生物，以允许预测模型的发展。在这项研究中进行了一系列的实验室实验，以调查光合有效辐射（PAR）和溴化活性之间的联系，通过酚红的溴化反应，在两个冷水海洋硅藻（海链藻anastritica，CCAP 1085/25;Porosira glacialis，CCMP 668）。南极铁藻的溴化活性会随光子通量密度的短期变化而变化，在260 μmol O2（mg chla）− 1h− 1以下，溴化活性与总光合速率有很强的正线性关系。多个昼夜循环的实验表明，南极毛藻在光照条件下的溴化活性比在黑暗条件下的溴化活性高2.8（± 1.0）倍。Whilst P.结果表明，该硅藻的溴化活性在光照条件下比在黑暗条件下高1.3倍（± 0.3）。在T.与无添加物对照相比，无添加物培养导致溴化活性显著增加2.4（± 0.3）倍，但在P中没有观察到这种反应。冰川这些结果表明，海洋硅藻的PAR光可用性和溴化活性之间存在联系，但这种关系的性质因物种而异。通过建立与共同生态系统模型状态变量（光和光合作用）的潜在联系，这项工作为发展海洋环境中溴化活动的预测能力迈出了第一步。需要开展更多的工作，以评估在更广泛的海洋区域的硅藻物种代表的PAR光可用性和溴化活性之间开发通用参数化的潜力。
Marine organisms mediate the formation of volatile inorganic (e.g. HOBr) and organic halogens (e.g. CHBr3) and contribute to the sea-to-air emission of bromine and iodine. This air-sea halogen exchange has implications for atmospheric chemistry. It is important to establish the physiological function of halogen metabolism in key groups of marine organisms to permit predictive model development. In this study a series of laboratory experiments was performed to investigate the link between the availability of photosynthetically active radiation (PAR) and brominating activity, as measured by the bromination of phenol red, in two cold-water marine diatoms (Thalassiosira antarctica, CCAP 1085/25;Porosira glacialis, CCMP 668). Brominating activity inT. antarcticawas found to change in response to short term changes in photon flux density and to have a strong positive linear relationship with gross photosynthetic rate up to 260 μmol O2(mg chla)− 1h− 1. Experiments performed across multiple diel cycles showed that light-phase brominating activities inT. antarcticawere a factor of 2.8 (± 1.0) higher than those measured in the dark. WhilstP. glacialisshowed no response to short term changes in PFD, measurements across a number of diel cycles revealed that light-phase brominating activities in this diatom were significantly higher than those in the dark by a factor of 1.3 (± 0.3). The addition of 0.1 μM H2O2to the medium ofT. antarcticacultures led to a significant increase in brominating activity by a factor of 2.4 (± 0.3) relative to no-addition controls but no such response was seen inP. glacialis. These results suggest that there is a link between PAR light availability and brominating activity in marine diatoms but that the nature of this relationship differs between species. By establishing a potential link with common ecosystem model state variables (light and photosynthesis) this work provides the first step towards developing a predictive capability for brominating activity in the marine environment. More work is needed to assess the potential for developing generalised parameterisations between PAR light availability and brominating activity in diatom species representative of a wider range of ocean regions.
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DOI：
--
发表时间：
2006
期刊：
影响因子：
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作者：
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作者：
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COTA, GF
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作者：
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