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12C (black) and 13C (gray) in the emission of isoprene by P. nigra mature leaves, before and after exposure to a 15-min 13CO2 labeling (left and center bars) and by leaves labeled for 15 min with 13CO2 after inhibiting isoprene emission by fosmidomycin (right bar). Total isoprene emission is shown as mean ± se (error bars) of n = 4 measurements. Labeled and unlabeled fractions of isoprene are shown as mean values. se of these fractions was always <10% of the mean.
