Figure 1.

The representative longitudinal sections in meristematic zone (A,A’–C,C’) and cross sections in the differentiated zone (A”–C”) of roots of barley cv. Sebastian. Calcofluor (CF) and DAPI staining. (A–A”)—control pH 6; (B–B”)—control pH 4; (C–C”)—30 µM AlCl₃. In A, B, and C, the root cap length is marked. (C’)—atypical cell divisions in exodermis and cortex are encircled. (C”)—red arrowheads show central and outer metaxylems with thickened walls, arrow shows xylem fiber. Rhz—rhizodermis, Ex—exodermis, En—endodermis, Co—cortex, Pr—pericycle, Cx—central xylem, Ox—outer xylem, F—fiber.