Fig. 3.

Root morphology. (A) A wild-type root apex in which a space is observed between the root epidermis and root cap (red arrow) at 2 weeks after germination. (B) oni3-7 root apex at 2 weeks after germination. (C and D) Close-up views of insets in (A) and (B), respectively. An air space between the root epidermis and root cap (red arrow) is apparent in (C), whereas the root epidermis and root cap are tightly fused in oni3-7 (blue arrow in D). RC, root cap; ST, stele; CO, cortex; EP, epidermis. Bars = 100 µm.