2015
DOI: 10.1111/pce.12562
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Abstract: There is a growing interest in accurate and comparable measurements of the CO2 photocompensation point (Γ*), a vital parameter to model leaf photosynthesis. The Γ* is measured as the common intersection of several CO2 response curves, but this method may incorrectly estimate Γ* by using linear fits to extrapolate curvilinear responses and single conductances to convert intercellular photocompensation points (Ci *) to chloroplastic Γ*. To determine the magnitude and minimize the impact of these artefacts on Γ* … Show more

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Cited by 48 publications
(72 citation statements)
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References 59 publications
(123 reference statements)
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“…S2). The mean C i * here falls between the value of G* from tobacco (Nicotiana tabacum; Bernacchi et al, 2002) commonly used for soybean (Bernacchi et al, 2005;Rosenthal et al, 2014;Köhler et al, 2017) and a value calculated from soybean Rubisco kinetic properties (Gallé et al, 2013), and it further matches exactly the C i * estimated for soybean with similar methodology (Walker and Ort, 2015). Thus, the mean C i * value was used as a proxy for G* in all calculations.…”
Section: Parameters Used To Estimate G Mmentioning
confidence: 99%
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“…S2). The mean C i * here falls between the value of G* from tobacco (Nicotiana tabacum; Bernacchi et al, 2002) commonly used for soybean (Bernacchi et al, 2005;Rosenthal et al, 2014;Köhler et al, 2017) and a value calculated from soybean Rubisco kinetic properties (Gallé et al, 2013), and it further matches exactly the C i * estimated for soybean with similar methodology (Walker and Ort, 2015). Thus, the mean C i * value was used as a proxy for G* in all calculations.…”
Section: Parameters Used To Estimate G Mmentioning
confidence: 99%
“…C i * was taken as the absolute value of the slope from the second regression, while R d was taken as the y intercept. We found no differences between C i * and R d calculated by the slope-intercept method of Walker and Ort (2015) and the traditional common-slope method (paired Student's t tests, P . 0.1 for both) or the SD values of these estimates.…”
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confidence: 98%
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“…This extended model partitions photorespired carbon loss between reentry into the chloroplast and release into the intercellular air space. It is still not certain whether such an extended model is necessary to interpret net carbon dioxide exchange around ambient carbon dioxide levels, and a recent advance in interpreting measurements of * indicates that the simple model presented in Equation 4 may explain most of the carbon dioxide transfer to the chloroplast, at least in soybean and wheat (81). Because the present model of mesophyll conductance appears to adequately describe leaf-level gas exchange, it seems reasonable to continue using it for higher-scale modeling until additional evidence is presented to the contrary.…”
Section: Figurementioning
confidence: 99%
“…In this issue of PC&E, Walker and Ort (2015) provide a method for analysing Γ* data so that the effects of small errors and uncertainties are minimized, giving a more robust estimate of Γ *.…”
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confidence: 99%