Fig. 4

CrWUL restores cambium layer in atwox4 null mutant lines. a-c Cross section of wild-type Col (a), atwox4 null mutant (b) and pAtWOX4:CrWUL (c) hypocotyl. d Number of procambium cells per section (mean ± SEM; ****, P ≤ 0.0001, N ≥ 10). e–g Cross section of wild-type Col (e), atwox4 (f) and pAtWOX4:CrWUL (g) base of 15 cm primary inflorescence. Red brackets indicate cambium cell layer (e–g). h Length of cambium tissues per section in base of 15 cm primary inflorescences (mean ± SEM; **, P ≤ 0.01; ****, P ≤ 0.0001, N ≥ 10). p: Phloem, x: Xylem, pc: Procambium. Scale Bars = 0.005 mm (a-c), 0.03 mm (e–g)