Fig. 4.

Diel net carbon budgets for young fully expanded leaves of Aechmea ‘Maya’ at ambient (380 µmol mol⁻¹) (left) and elevated (700 µmol mol⁻¹) (right) CO₂. Fluxes shown above the horizontal line mainly coincide with degradation of malic acid and concomitant accumulation of carbohydrate reserves while those under the horizontal line are characterized by the reverse process. Gas exchange data were calculated as the integrated mean from five replicate leaves and metabolites were sampled from ten replicate leaves on individual plants. Export includes growth and maintenance and all units are mmol C m⁻² d⁻¹. * accumulated hexose carbon which is not degraded or exported overnight.