Scaling to a common temperature improves the correlation between the photosynthesis parameters Jmax and Vcmax

A strong correlation between the photosynthetic parameters J max and V cmax was found by Wullschleger (1993) in a survey of 109 plant species. Measurements were made at various leaf temperatures, but the temperature dependence of J max and V cmax differ. Once values for J max and V cmax in Wullschleger's analysis were adjusted to a common temperature, using an equation for the temperature dependence of these parameters, the slope of the linear regression for J max versus V cmax forced through the origin increased from 1.97 to 2.68, and r 2 increased from 0.79 to 0.87.