Figure 4.

The content of phenolic compounds in different parts of plants R. crispus and R. obtusifolius at flowering and fruiting stages (a), and vertical distribution of phenolic compounds at flowering stage (b) and at fruiting stage (c). Different lower case letters indicate significant differences among plant parts of R. crispus; upper case letters indicate significant differences among plant parts of R. obtusifolius (p ≤ 0.05); asterisk * indicates significant differences among sorrel species (p ≤ 0.05) based on post hoc Tukey’s tests separately for each growth stage.