Fig. 1

Whole-mount immunolocalisation of PIN1 in A. thaliana root tip. A longitudinal section (above) and five transverse sections (1–5) showing anti-PIN1 signal (green channel) and anti-PIN2 staining (white channel). CEI—cortex/endodermis initials, ELI—epidermis/lateral root cap initials, CSC—columella stem cell (columella initials), QC—the quiescent centre, c2—the second columella tier, c3—the third columella tier, epid—epidermis, c—cortex, en—endodermis, prc—pericycle, vsc—vasculature, px—protoxylem, pph—protophloem, mx—metaxylem. Coloured triangles—the end of the expression domain in the respective layer. White triangle—rootward PIN1 location in xylem elements in the elongation zone. MZ—the meristematic zone. Bars = 50 μm