Cortical parenchyma (cp)- and stele (s)-specific profiling of phytohormones and phytohormone precursors revealed cortical parenchyma-specific accumulation of cytokinin and stele-specific accumulation of auxin and their precursors. A, Cytokinin (c-Z), cytokinin (c-ZR), and a cytokinin conjugate (c-ZOG). B, IAA and the IAA conjugate IAA-Asp. C, Abscisic acid (ABA). DW, Dry weight. **P ≤ 0.01; *P ≤ 0.05.