Figure 4. Light microscope images (left) and the corresponding tritium sensitive film MARs (right) of the slides with the cross-sections of the eight-day old wheat seedling treated with [³H]HA (50 mg·L⁻¹, ~0.7 mCi L⁻¹, 24 h).

Exposure time for MARs was 97 days. (a) the transverse section of the shoot tip; (b) The longitudinal section of the leaf blade; (c) the longitudinal section of the root elongation zone; (d) the transverse section of the root elongation zone; (e) the transverse section of the root cap. Vb – vascular bundle; S – stele (c,d) Rh – root hair; Ep – epiblema; En – endodermis. The sections were alphabetically labelled with regards to the upward water movement in the plant from the root to the shoot.