An abiotic source of Archean hydrogen peroxide and oxygen that pre-dates oxygenic photosynthesis.
An abiotic source of Archean hydrogen peroxide and oxygen that pre-dates oxygenic photosynthesis.
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DOI：
10.1038/s41467-021-26916-2
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发表时间：
2021-11-16
影响因子：
16.6
通讯作者：
Konhauser KO
中科院分区：
文献类型：
--
作者：
He H;Wu X;Xian H;Zhu J;Yang Y;Lv Y;Li Y;Konhauser KO
光合作用的进化是地球历史上的一个关键事件，因为释放的O2从根本上改变了地球的氧化还原状态，促进了多细胞生命的出现。一个有趣的假说提出，过氧化氢（H2O2）曾经作为电子供体之前，氧光合作用的演变，但其丰富的太古代将是有限的。在这里，我们报告了一个以前未被认识到的非生物途径太古代过氧化氢生产，涉及石英表面的磨损和随后产生的表面结合的自由基，可以有效地氧化H2O到H2O2和O2。我们建议，在动荡的水下环境，如河流，河口和三角洲，这一过程可能提供了足够的H2O2源，导致生成的生物O2，创造了进化动力的起源产氧光合作用。过氧化氢（H2O2）被认为是光合作用的电子供体，然而，早期地球上可用的H2O2数量被认为是有限的。在这里，作者提出了一种新的非生物途径，其中石英表面的磨损将提供足够的H2O2。
The evolution of oxygenic photosynthesis is a pivotal event in Earth’s history because the O2 released fundamentally changed the planet’s redox state and facilitated the emergence of multicellular life. An intriguing hypothesis proposes that hydrogen peroxide (H2O2) once acted as the electron donor prior to the evolution of oxygenic photosynthesis, but its abundance during the Archean would have been limited. Here, we report a previously unrecognized abiotic pathway for Archean H2O2 production that involves the abrasion of quartz surfaces and the subsequent generation of surface-bound radicals that can efficiently oxidize H2O to H2O2 and O2. We propose that in turbulent subaqueous environments, such as rivers, estuaries and deltas, this process could have provided a sufficient H2O2 source that led to the generation of biogenic O2, creating an evolutionary impetus for the origin of oxygenic photosynthesis. Hydrogen peroxide (H2O2) has been proposed as an electron donor for photosynthesis before water, however, the amount of H2O2 available on early Earth was thought to be limited. Here the authors propose a new abiotic pathway wherein abrasion of quartz surfaces would have provided enough H2O2.
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