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Al- (90 μm, 6 h) induced callose deposits in cells within the elongation zone (A). Cells of the DTZ accumulated the highest amounts of callose (B). Low amounts of callose were found in the outer cortex cells behind the quiescent center (C). The callose formation was restricted to the epidermis (e) and outer cortex (oc) cells throughout the root apex. All root apices are facing the bottom of this figure. ic, Inner cortex; m, meristem. Bar = 23 μm.
