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- W2100085508 abstract "Variation in the C18OO content of atmospheric CO2 (delta18Oa) can be used to distinguish photosynthesis from soil respiration, which is based on carbonic anhydrase (CA)-catalyzed 18O exchange between CO2 and 18O-enriched leaf water (delta18Ow). Here we tested the hypothesis that mean leaf delta18Ow and assimilation rates can be used to estimate whole-leaf C18OO flux (isoflux), ignoring intraleaf variations in CA activity and gas exchange parameters. We observed variations in CA activity along the leaf (> 30% decline from the leaf center toward the leaf ends), which were only partially correlated to those in delta18Ow (7 to 21 per thousand), delta18O and delta13C of leaf organic matter (25 to 30 per thousand and -12.8 to -13.2 per thousand, respectively), and substomatal CO2 concentrations (intercellular CO2 concentrations, c(i), at the leaf center were approximately 40% of those at the leaf tip). The combined effect of these variations produced a leaf-integrated isoflux that was different from that predicted based on bulk leaf values. However, because of canceling effects among the influencing parameters, isoflux overestimations were only approximately 10%. Conversely, use of measured parameters from a leaf segment could produce large errors in predicting leaf-integrated C18OO fluxes." @default.
- W2100085508 created "2016-06-24" @default.
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- W2100085508 creator A5010503429 @default.
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- W2100085508 date "2005-11-25" @default.
- W2100085508 modified "2023-10-14" @default.
- W2100085508 title "Effects of intraleaf variations in carbonic anhydrase activity and gas exchange on leaf C<sup>18</sup>OO isoflux in <i>Zea mays</i>" @default.
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- W2100085508 doi "https://doi.org/10.1111/j.1469-8137.2005.01603.x" @default.
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