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High CO2 levels drive the TCA cycle backwards towards autotrophy

Nature, 2021
It has recently been shown that in anaerobic microorganisms the tricarboxylic acid (TCA) cycle, including the seemingly irreversible citrate synthase reaction, can be reversed and used for autotrophic fixation of carbon1,2. This reversed oxidative TCA cycle requires ferredoxin-dependent 2-oxoglutarate synthase instead of the NAD-dependent dehydrogenase
Lydia Steffens   +6 more
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Autotrophy and heterotrophy in root herniparasites

Trends in Ecology & Evolution, 1989
More than 3000 species of flowering plants are at least partially parasitic, acquiring water and solutes from the host via haustoria. More than one third of all parasitic angiosperms - the root hemiparasites - possess green leaves and root systems.
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