Regional control of partially fused petunia corollas

Angiosperm petal fusion (sympetaly) has evolved multiple times independently and is associated with increased specificity between plants and their pollinators. To undercover developmental genetic changes that might have led to the evolution of sympetaly in the asterid core eudicot genus Petunia (Solanaceae), we carried out global and fine-scale gene expression analyses in different regions of the corolla.