THE MINIMUM PHOTON REQUIREMENT FOR PHOTOSYNTHESIS : AN ANALYSIS OF THE DATA OF WARBURG & BURK (1950) AND YUAN, EVANS & DANIELS (1955)
Variations in the apparent photon requirement for photosynthesis (Φ-1 co 2 ) or (Φ-1 co 2 ) in the data of Warburg & Burk (1950) and Yuan, Evans & Daniels (1955) can be ascribed to changes in O2 uptake and energy-dependent processes which result in aberrant photon requirements in organisms s...
| Veröffentlicht in: | The New phytologist. - 1979. - 106(1987), 4 vom: 20. Aug., Seite 631-644 |
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| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
1987
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| Zugriff auf das übergeordnete Werk: | The New phytologist |
| Schlagworte: | Journal Article Minimum photon requirement for photosynthesis Z scheme glycollate nitrate metabolism |
| Zusammenfassung: | Variations in the apparent photon requirement for photosynthesis (Φ-1 co 2 ) or (Φ-1 co 2 ) in the data of Warburg & Burk (1950) and Yuan, Evans & Daniels (1955) can be ascribed to changes in O2 uptake and energy-dependent processes which result in aberrant photon requirements in organisms subjected to non-optimal conditions. The increase in Φ-1 co 2 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-1 co 2 and Φ-1 co 2 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 O2 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-1 O2 . These results provide direct independent evidence for a photon requirement for photosynthesis of less than 8 mol photons mol-1 O2 . Such a value is not consistent with the Z scheme of photosynthesis |
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| Beschreibung: | Date Revised 20.04.2021 published: Print Citation Status PubMed-not-MEDLINE |
| ISSN: | 1469-8137 |
| DOI: | 10.1111/j.1469-8137.1987.tb00164.x |