Reduced vascular region and cambial division in TRV:156 (control) and TRV:GhWOX4 (VIGS). (A) Stem-control (CK) longitudinal cross-section. (B) Stem (CK) transverse cross-section. (C) Anatomical close up of CK plant. (D) Stem (VIGS) longitudinal cross-section. (E) Stem (VIGS) transverse cross-section. (F) Anatomical close up of VIGS plant. (G) Phloem width in the stem of CK and VIGS plant. (H) Xylem width in the stem of CK and VIGS plant. (I) Stem diameter comparison of CK and VIGS plant. (J) Plant height comparison of CK and VIGS plant. Bar = 200 µm or 30 µm. C, cambium; P, phloem; X, xylem; PR, phloem ray; D, division activity. The data represent the means ± SE from three independent experiments, t-tests: * p < 0.05, ** p < 0.01.