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Label-derived leaf 13CO2 respiration (RLabel, μmol 13CO2 m-2 s-1) during light–dark transitions in Oxalis triangularis. Leaves were fed with position-specific 13C-labeled malate (13C-1, 13C-4) or pyruvate (13C-1, 13C-2) for about 40 min (20 min in the light and 20 min in the dark). Gray areas denote dark periods. Black bold lines denote mean values, while symbols indicate single replicates (n = 3–4 individuals).
