Fig. 5
From: Q&A: How do plants respond to cytokinins and what is their importance?
Local function of cytokinins in shoot apical meristem and root tip. a Schematic diagram of cytokinin production and response in shoot apical meristem. Active cytokinins are produced in the epidermal L1 layer and central zone. They diffuse basipetally and function in the AHK4-expressing organizing center. b Schematic diagram of cytokinin production and response in root tip. Active cytokinins are produced in AHP6-expressing protoxylem. They diffuse and function in adjacent procambium cells while repressing AHP6 expression