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首页> 美国卫生研究院文献>other >Effect of irradiance on the emission of short-lived halocarbons from three common tropical marine microalgae
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Effect of irradiance on the emission of short-lived halocarbons from three common tropical marine microalgae

机译：辐照度对三种常见热带海洋微藻中短寿命卤代烃排放的影响

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Marine algae have been reported as important sources of biogenic volatile halocarbons that are emitted into the atmosphere. These compounds are linked to destruction of the ozone layer, thus contributing to climate change. There may be mutual interactions between the halocarbon emission and the environment. In this study, the effect of irradiance on the emission of halocarbons from selected microalgae was investigated. Using controlled laboratory experiments, three tropical marine microalgae cultures, Synechococcus sp. UMACC 371 (cyanophyte), Parachlorella sp. UMACC 245 (chlorophyte) and Amphora sp. UMACC 370 (diatom) were exposed to irradiance of 0, 40 and 120 µmol photons m−2s−1. Stress in the microalgal cultures was indicated by the photosynthetic performance (Fv/Fm, maximum quantum yield). An increase in halocarbon emissions was observed at 120 µmol photons m−2s−1, together with a decrease in Fv/Fm. This was most evident in the release of CH3I by Amphora sp. Synechococcus sp. was observed to be the most affected by irradiance as shown by the increase in emissions of most halocarbons except for CHBr3 and CHBr2Cl. High positive correlation between Fv/Fm and halocarbon emission rates was observed in Synechococcus sp. for CH2Br2. No clear trends in correlation could be observed for the other halocarbons in the other two microalgal species. This suggests that other mechanisms like mitochondria respiration may contribute to halocarbon production, in addition to photosynthetic performance.
机译：据报道，海藻是排放到大气中的生物挥发性卤代烃的重要来源。这些化合物与臭氧层的破坏有关，从而导致了气候变化。卤化碳排放与环境之间可能存在相互作用。在这项研究中，研究了辐照度对所选微藻中卤代烃排放的影响。使用受控实验室实验，三种热带海洋微藻培养物Synechococcus sp.。 UMACC 371（蓝藻），Parachlorella sp。 UMACC 245（绿藻）和Amphora sp。将UMACC 370（硅藻）暴露于0、40和120μmol光子m -2 s -1 的辐照下。光合性能（Fv / Fm，最大量子产率）表明了微藻培养物中的胁迫。在120 µmol光子m -2 s -1 处，卤代烃排放量增加，而Fv / Fm减少。这在Amphora sp。释放CH3I时最明显。球菌如图所示，除CHBr3和CHBr2Cl以外，大多数卤代烃的排放量增加表明，辐照度受辐射的影响最大。在Synechococcus sp。中观察到Fv / Fm与卤代烃排放速率之间存在高度正相关。 CH2Br2。对于其他两个微藻物种中的其他卤代烃，没有观察到明显的相关趋势。这表明除了光合作用以外，其他机制如线粒体呼吸也可能有助于卤代烃的产生。

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