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Lignification of the maize roots (hybrid Bielik) after 3 days of cultivation in the paper rolls as control (a,c) or treated with PAW (b,d). The hand cross sections were 10% from the root apex (a,b) or on the root base (c,d) and stained with phluoroglucinol-HCl. The arrows point at the exodermis (green), endodermis (yellow), and early metaxylem (white). Scale bars = 100 μm.
