Extending the ‘one-point method’ for estimations of leaf photosynthetic capacity to a broader temperature range
The ‘one-point method’ (OPM) is a quick approach to estimate the maximum apparent carboxylation rate of Rubisco (Vʹcmax) based on a single measurement of leaf carbon assimilation rate taken under saturating light and ambient CO2, lately equal to 400 ppm (De Kauwe et al., 2016,). However, the OPM overestimates Vʹcmax at high temperatures (Burnett et al., 2019). This overestimation results from the reliance of the method on a linear relationship between Vʹcmax and leaf respiration rates under light (Rday), as a fixed Rday:Vcmax ratio equal to 1.5%, while these parameters have different temperature dependencies. Here, we highlight the importance of the adoption of a temperature-dependent scaling factor for the Rday:Vcmax ratio as a way to prevent the overestimation of the photosynthetic capacity at temperatures >35 °C.
| Main Authors: | , , , |
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| Format: | Article/Letter to editor biblioteca |
| Language: | English |
| Subjects: | Life Science, |
| Online Access: | https://research.wur.nl/en/publications/extending-the-one-point-method-for-estimations-of-leaf-photosynth |
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