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Effect of exposure to different temperatures (15, 20, 25, and 30 °C) on secondary metabolism keys—(A) shikimic acid content and (B) phenylalanine ammonia lyase (PAL) activity—of in vitro cultures and micropropagated plants of Lavandula viridis and Thymus lotocephalus. For each species, the results were analyzed by one-way analysis of variance (ANOVA) and the graph bars followed by different letters (a–d) are significantly different at p < 0.05 (Duncan’s New Multiple Range Test).
