Figure 5.

Plant age-dependent profiles of nutrient concentrations and contents in seminal roots with progressing plant age. Concentrations and of contents of nitrogen (A), phosphorus (B), zinc (C), and potassium (D) in seminal roots of hydroponically grown barley plants that were examined weekly from 18 to 53 d after germination (dag). Root element contents represent the total amount in the seminal root biomass. Symbols represent means ± se. Different letters indicate significant differences among means according to Tukey’s test at P < 0.05 (n = 6 independent biological replicates).