AI Article Synopsis
- The variation in photon requirements for photosynthesis noted in studies by Warburg & Burk (1950) and Yuan et al. (1955) is linked to changes in oxygen uptake and energy-related processes under suboptimal conditions.
- An increase in the gas exchange quotient correlates with heightened photorespiratory production of glycollate, while other observed variations relate to nitrate assimilation and the Kok effect at lower light levels.
- Optimal conditions for Chlorella yield a minimum photon requirement of 6 mol photons per mol O, supporting a photon requirement for photosynthesis to be less than 8 mol photons per mol O, which contradicts the traditional Z scheme of photosynthesis.
Article Abstract
Variations in the apparent photon requirement for photosynthesis (Φ ) or (Φ ) in the data of Warburg & Burk (1950) and Yuan, Evans & Daniels (1955) can be ascribed to changes in O uptake and energy-dependent processes which result in aberrant photon requirements in organisms subjected to non-optimal conditions. The increase in Φ with increases in the gas exchange quotient (γ) in the observations of Yuan et al. (1955) is consistent with increases in photorespiratory production of glycollate, whilst changes in Φ and Φ in the results of Warburg & Burk (1950) can be explained by a variable Kok effect associated with nitrate assimilation at low light levels. When these O and energy-dependent processes are minimal, the lowest values should be observed. The minimum value obtained when Chlorella is photosynthesizing under optimal conditions is 6 mol photons mol O . These results provide direct independent evidence for a photon requirement for photosynthesis of less than 8 mol photons mol O . Such a value is not consistent with the Z scheme of photosynthesis.
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| http://dx.doi.org/10.1111/j.1469-8137.1987.tb00164.x | DOI Listing |
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