Aquatic and terrestrial cyanobacteria produce methane
Aquatic and terrestrial cyanobacteria produce methane
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DOI：
10.1126/sciadv.aax5343
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发表时间：
2020-01-01
期刊：
影响因子：
13.6
通讯作者：
Grossart, H-P
中科院分区：
文献类型：
--
作者：
Bizic, M.;Klintzsch, T.;Grossart, H-P
越来越多的证据正在挑战生物产甲烷，被认为是一个严格的厌氧过程，是专属于古细菌的范式。我们表明，蓝藻生活在海洋，淡水和陆地环境中产生甲烷在光照，黑暗，有氧和缺氧条件下，在全球相关的和古老的光合自养生物组的光驱动的初级生产力与甲烷生产率。利用稳定同位素标记技术，蓝藻的甲烷产量在产氧光合作用过程中得到了提高。我们认为，甲烷的形成蓝藻有助于甲烷积累在氧饱和的海洋和湖泊表面沃茨。在这些环境中，频繁的蓝藻水华预计将进一步增加，因为全球变暖可能对气候变化产生直接的正反馈。我们的结论是，这个新发现的来源有助于目前的天然甲烷预算，最有可能一直在产生甲烷，因为蓝藻首次在地球上进化。
Evidence is accumulating to challenge the paradigm that biogenic methanogenesis, considered a strictly anaerobic process, is exclusive to archaea. We demonstrate that cyanobacteria living in marine, freshwater, and terrestrial environments produce methane at substantial rates under light, dark, oxic, and anoxic conditions, linking methane production with light-driven primary productivity in a globally relevant and ancient group of photoautotrophs. Methane production, attributed to cyanobacteria using stable isotope labeling techniques, was enhanced during oxygenic photosynthesis. We suggest that the formation of methane by cyanobacteria contributes to methane accumulation in oxygen-saturated marine and limnic surface waters. In these environments, frequent cyanobacterial blooms are predicted to further increase because of global warming potentially having a direct positive feedback on climate change. We conclude that this newly identified source contributes to the current natural methane budget and most likely has been producing methane since cyanobacteria first evolved on Earth.