Mutual repression of AP2 and SOC1 couples changes in shoot apical meristem morphology with floral transition in Arabidopsis

APETALA2 (AP2) is a repressor of floral transition, yet a positive regulator of shoot meristem size. In this study, we demonstrate that AP2 is a positive regulator of meristem size during early stages of floral transition and that is essential for doming of the SAM. To characterise the changes in expression that lead to absence of doming in ap2-12 mutants, we performed RNA-Sequencing for meristems harvested from Col-0 and ap2-12 mutants throughout floral transition under continuous long days.