Inhibition of respiratory O2 uptake by
SA and its analogs. A, Tobacco cell cultures were incubated with
various concentrations of SA for 10 min before the measurement for
respiratory O2 uptake. B, Tobacco cell cultures were
incubated with 0.5 mm SA, acetylsalicylic acid (ASA),
5-chlorosalicylic acid (5-CSA), 3-hydroxybenzoic acid (3-HBA), or
4-hydroxybenzoic acid (4-HBA) for 30 min before the measurement for
respiratory O2 uptake. FW, Fresh weight.