Fig. 4From: Chitosan enhances rosmarinic acid production in shoot cultures of Melissa officinalis L. through the induction of methyl jasmonateEffect of chitosan levels on total phenolic compound (a) and rosmarinic acid (b) of Melissa officinalis shoot cultures. Each value is expressed as mean ± standard deviation. Differences were significant at p < 0.05 level (one-way ANOVA followed by LSD test)Back to article page