An auxin-induced transcriptional cascade CmBES1–CmSAUR66 orchestrates the ray floret development in Chrysanthemum morifolium

Proceedings of the National Academy of Sciences, Volume 123, Issue 18, May 2026. <br/>SignificanceThe fusion of petals into a corolla tube was a key innovation in flower evolution. Still, its genetic control in lineages with petals initiating from a shared ring primordium remains mysterious. We identify a regulatory module in chrysanthemum …