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jpy12156-sup-0001-FigS1.pdfapplication/PDF845KFigure S1. The sensitivity of photosynthesis (A) and respiration (B) rates to the choice of parameters in the calculation. Filled circles are solutions calculated assuming that the Mehler reaction and photorespiration each consume 20% and 5% of gross photosynthesis respectively. Unfilled circles are solutions assuming that the Mehler reaction and photosynthesis decline with increasing CO2 from 20% and 5%, respectively, under low CO2 to 0% under high CO2. Filled triangles are solutions assuming that the Mehler reaction and photorespiration consume 0% of photosynthetic oxygen across all CO2 treatments. Unfilled squares mark solutions calculated assuming that photosynthetic oxygen production does not fractionate 18O/16O (Guy et al. 1993) rather than the fractionation of 1.0045 used to calculate the other solutions (Eisenstadt et al. 2010). The lines associated with each set of points are the linear best fit, and P-values indicate the confidence in the correlation of the linear fit, error bars indicate the measurement uncertainty (±SD) as determined by Monte Carlo analysis.
jpy12156-sup-0002-FigS2.pdfapplication/PDF783KFigure S2. The effect of long and short acclimations on chlorophyll a content, photosynthesis and respiration rates versus fCO2. Black circles represent short acclimation experiments; grey squares represent long acclimation experiments. (A–C) Normalized chlorophyll a fluorescence, photosynthesis, and respiration rates respectively. The measurement uncertainty in median chlorophyll a fluorescence is very small due to a large sample size (>20,000 cells). The error bars on B and C indicate the measurement uncertainty (±SD) as determined by Monte Carlo analysis.

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