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Introduction of changes in volatile exudates of leaves under the control and the low light conditions. (A) Gas chromatography–mass spectrometry (GC-MS) analysis of plants under the control (up) and low light (bottom) conditions. (B) MS/MS spectra of significantly changed compounds between the two light conditions, i.e., menthol, pulegone, piperitone, and the internal standard substance bornanone. (C) Relative contents of volatile compounds: menthol, pulegone, and piperitone.
