In:
New Phytologist, Wiley, Vol. 106, No. 4 ( 1987-08), p. 631-644
Abstract:
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 O 2 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 O 2 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 O 2 . These results provide direct independent evidence for a photon requirement for photosynthesis of less than 8 mol photons mol −1 O 2 . Such a value is not consistent with the Z scheme of photosynthesis.
Type of Medium:
Online Resource
ISSN:
0028-646X
,
1469-8137
DOI:
10.1111/nph.1987.106.issue-4
DOI:
10.1111/j.1469-8137.1987.tb00164.x
Language:
English
Publisher:
Wiley
Publication Date:
1987
detail.hit.zdb_id:
208885-X
detail.hit.zdb_id:
1472194-6
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