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Basal root cross‐sections. (a) 3 cm from apex, the arrow point at the endodermal Casparian strip (“ecs”); (b) 5 cm from apex; (c) 8 cm from apex, the arrow point at the suberin lamellae that formed on the endodermis (“sl”); (d) 10 cm from apex; (e) 15 cm from apex, the “mmx” arrow points the lignify cell wall of the mature metaxylem vessels, the “excs” arrow points the exodermal Casparian strip; (f) 20 cm from apex; (g) 25 cm from apex; and (h) 30 cm from apex. Bar = 50 μm
