This study demonstrated that a PIN2-based transient polar auxin transport, through a file of elongated marginal cells (MCs), in the borders of cotyledons, underpins the formation of an auxin maximum at the tip of cotyledons. This auxin maximum contributes to the coordinated morphogenesis of the interdigitated puzzle-shaped pavement cells at the very early stage of cotyledon expansion.
- Patricio Pérez-Henríquez
- Shingo Nagawa
- Zhenbiao Yang
