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Left: Opuntia Ficus indica (prickly pear) in the King Abdullah University of Sciences and Technology (KAUST), Thuwal, Saudi Arabia. Right: schematic representation of a cactus rain root (cross-section); thick cell walls in the epidermis, inner cortex and endodermis indicate suberization; root scheme adapted according to [50,51,55]; scale bar 100 µm.
