THE RELATION OF PHOTOSYNTHESIS TO RESPIRATION

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The gas exchange by barley leaves of oxygen, carbon dioxide, and added radiocarbon dioxide has been measured in a closed system, with the following results: 1. Carbon dioxide follows different but not necessarily independent paths in photosynthesis and light respiration. 2. The carbon of newly formed photosynthetic intermediates is not available for respiration while the light is on, but becomes immediately respirable in the dark, The enhancement of dark respiration after a light period is largely due to built-up ''photosynthates.'' 3. Photosynthesis proceeds at a measurable rate even at the lowest CO{sub 2} pressures observed (0.03 mm Hg). There is ... continued below

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Weigl, J.W.; Warrington, P.M. & Calvin, M. July 20, 1950.

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Description

The gas exchange by barley leaves of oxygen, carbon dioxide, and added radiocarbon dioxide has been measured in a closed system, with the following results: 1. Carbon dioxide follows different but not necessarily independent paths in photosynthesis and light respiration. 2. The carbon of newly formed photosynthetic intermediates is not available for respiration while the light is on, but becomes immediately respirable in the dark, The enhancement of dark respiration after a light period is largely due to built-up ''photosynthates.'' 3. Photosynthesis proceeds at a measurable rate even at the lowest CO{sub 2} pressures observed (0.03 mm Hg). There is no evidence for a ''threshold'' concentration of carbon dioxide for the reaction; at the lowest concentrations reached, respiration exactly equals assimilation, 4. The mean rate of respiratory CO{sub 2} evolution in strong light was found to be less than that in the dark. Internal re-photosynthesis of respiratory carbon may have been sufficient to account for this effect. 5. The assimilation of C{sup 14}O{sub 2} is about 17% slower than that of C{sup 12}O{sub 2}.

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  • Report No.: UCRL--811
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.2172/910356 | External Link
  • Office of Scientific & Technical Information Report Number: 910356
  • Archival Resource Key: ark:/67531/metadc891220

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  • July 20, 1950

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  • Sept. 22, 2016, 2:13 a.m.

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  • Nov. 3, 2016, 7:59 p.m.

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Weigl, J.W.; Warrington, P.M. & Calvin, M. THE RELATION OF PHOTOSYNTHESIS TO RESPIRATION, report, July 20, 1950; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc891220/: accessed August 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.