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Expression of the pMIZ1::GUS fusion gene in 4-day-old A. thaliana (Columbia) seedlings. Extensive GUS activity is observed in the root cap (black arrowhead), the mature region of the root (white arrowhead), and the hydathodes (water-excreting epidermal structures) of the leaves (arrow). Note the strong expression of pMIZ1::GUS in the columella cells but not in the elongation zone of the root. (Scale bars: A, 5 mm; B–D, 500 μm; E, 100 μm.)
