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V c,max and J max down-regulation. In Leucadendron ,a general physiological mechanism seems to control Four South African Leucadendron congenerics with excess carbohydrate formation, and photosynthetic divergent soil N and P preferences were grown as responsiveness to elevated CO 2 , independently of juveniles at contrasting nutrient concentrations at genotype and nutrient concentration. This mechanism ambient (350 mmol mol’1) and elevated (700 mmol mol’1) may underlie photosynthetic acclimation to atmospheric CO 2 levels. Photosynthetic parameters source:sink imbalances resulting from such diverse were related to leaf nutrient and carbohydrate status conditions as elevated CO 2 , low sink strength, low to reveal controls of carbon uptake rate. In all species, carbohydrate export, and nutrient limitation. elevated CO 2 depressed both the maximum Rubisco catalytic activity (V c,max , by 19‐44%) and maximum Key words: Carbohydrate, elevated CO 2 , nitrogen, photoelectron transport rate (J max , by 13‐39%), indicating synthesis, Proteaceae. significant photosynthetic acclimation of both measures. Even so, all species had increased maximum

Nutrient and genotypic effects on CO2-responsiveness: photosynthetic regulation in Leucadendron species of a nutrient-poor environment