The evolution and productivity of carbon fixation pathways in response to changes in oxygen concentration over geological time

Free Radical Biology & Medicine
Lewis M Ward, Patrick M Shih

Abstract

The fixation of inorganic carbon species like CO2 to more reduced organic forms is one of the most fundamental processes of life as we know it. Although several carbon fixation pathways are known to exist, on Earth today nearly all global carbon fixation is driven by the Calvin cycle in oxygenic photosynthetic plants, algae, and Cyanobacteria. At other times in Earth history, other organisms utilizing different carbon fixation pathways may have played relatively larger roles, with this balance shifting over geological time as the environmental context of life has changed and evolutionary innovations accumulated. Among the most dramatic changes that our planet and the biosphere have undergone are those surrounding the rise of O2 in our atmosphere-first during the Great Oxygenation Event at ∼2.3 Ga, and perhaps again during Neoproterozoic or Paleozoic time. These oxygenation events likely represent major step changes in the tempo and mode of biological productivity as a result of the increased productivity of oxygenic photosynthesis and the introduction of O2 into geochemical and biological systems, and likely involved shifts in the relative contribution of different carbon fixation pathways. Here, we review what is known from bo...Continue Reading

Citations

Aug 23, 2020·Environmental Microbiology·Ke-Qing XiaoYong-Guan Zhu
Aug 10, 2019·Frontiers in Microbiology·Lewis M WardHannah Holland-Moritz
Jan 24, 2021·Scientific Reports·L M WardP M Shih
Jan 10, 2021·Journal of Plant Physiology·Ireneusz Ślesak, Halina Ślesak
May 7, 2021·Microbes and Environments·Paula ProndzinskyShawn E McGlynn

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