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Energy costs of carbon dioxide concentrating mechanisms in aquatic organisms

Raven, John A. ; Beardall, John ; Giordano, Mario

Photosynthesis Research, Sept, 2014, Vol.121(2-3), p.111(14) [Periódico revisado por pares]

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  • Título:
    Energy costs of carbon dioxide concentrating mechanisms in aquatic organisms
  • Autor: Raven, John A. ; Beardall, John ; Giordano, Mario
  • Assuntos: Photosynthesis -- Physiological Aspects ; Photosynthesis -- Economic Aspects ; Carbon Dioxide -- Physiological Aspects ; Carbon Dioxide -- Economic Aspects ; Plant Biochemistry -- Physiological Aspects ; Plant Biochemistry -- Economic Aspects
  • É parte de: Photosynthesis Research, Sept, 2014, Vol.121(2-3), p.111(14)
  • Descrição: Minimum energy (as photon) costs are predicted for core reactions of photosynthesis, for photorespiratory metabolism in algae lacking CO sub(2) concentrating mechanisms (CCMs) and for various types of CCMs; in algae, with CCMs; allowance was made for leakage of CO sub(2) from the internal pool. These predicted values are just compatible with the minimum measured photon costs of photosynthesis in microalgae and macroalgae lacking or expressing CCMs. More energy-expensive photorespiration, for example for organisms using Rubiscos with lower CO sub(2)-O sub(2) selectivity coefficients, would be less readily accommodated within the lowest measured photon costs of photosynthesis by algae lacking CCMs. The same applies to the cases of CCMs with higher energy costs of active transport of protons or inorganic carbon species, or greater allowance for significant leakage from the accumulated intracellular pool of CO sub(2). High energetic efficiency can involve a higher concentration of catalyst to achieve a given rate of reaction, adding to the resource costs of growth. There are no obvious mechanistic interpretations of the occurrence of CCMs algae adapted to low light and low temperatures using the rationales adopted for the occurrence of C sub(4) photosynthesis in terrestrial flowering plants. There is an exception for cyanobacteria with low-selectivity Form IA or IB Rubiscos, and those dinoflagellates with low-selectivity Form II Rubiscos, for which very few natural environments have high enough CO sub(2):O sub(2) ratios to allow photosynthesis in the absence of CCMs.
  • Idioma: English

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