Fig. 4

Mass isotopomer distribution (%) of pulegone in different leaf pair found under different light intensities. a shoot culture at 5 μmol m⁻² s⁻¹ light intensity, b shoot culture at 10 μmol m⁻² s⁻¹ light intensity, c shoot culture at 20 μmol m⁻² s⁻¹ light intensity and d shoot culture at 30 μmol m⁻² s⁻¹ light intensity. Measurement was taken on (i) 15 DALV and (ii) 20 DALV for each light intensity (mean ± standard error, n = 5)