Photorespiration in Green Plants During Photosynthesis Estimated by Use of Isotopic CO(2) |
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Authors: | Samish Y Koller D |
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Institution: | Department of Botany, The Hebrew University of Jerusalem, Israel. |
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Abstract: | Photosynthetic re-absorption of photorespired CO2 causes underestimation in measured photorespiration and turnover rate of the substrate for photorespiration. Actual values of photorespiration exceed the measured by a factor greater than 1 + R′w/rp + CL]x/(rp·Lx). (R′w and rp are the partial resistances to CO2 uptake between atmosphere, mesophyll evaporating surface, and photosynthetic sink, respectively; Lx is the measured flux of photorespired CO2 and CL]x is the ambient conc of photorespired CO2). In 8 species, 1 + R′w/rp alone amounted to a correction ranging between 148% and 233%. |
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