Ozone Treatment as an Approach to Induce Specialized Compounds in <i>Melissa officinalis</i> Plants.

Conversely, the protocatechuic acid content did not exhibit a clear trend: it increased already at a CUO of 2.75 mmol m −2 (+97%) before reaching a maximum at a CUO of 4.93 mmol m −2 , came back to the control level at a CUO of 6.95 mmol m −2 , and increased again until the end of the exposure (more than 18-fold than the control; Figure 4 c).

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