In Arabidopsis, the production of flowers by the inflorescence meristem is controlled mainly by the LEAFY (LFY), APETALA1 (AP1), CAULIFLOWER (CAL), TERMINAL FLOWER1 (TFL1), and FRUITFULL (FUL) transcription factors. LFY, AP1, CAL and FUL promote the identity of the floral meristem and TFL1 is required to maintain the identity of the inflorescence meristem, regulating the timing of LFY, and AP1 expression. Besides its role in forming the floral meristem, AP1 also participates in the formation of sepals and petals, and FUL in the formation of carpels. This study aims to identify potential orthologs of the AP1 and FUL MADS-box genes in the genus Passiflora, characterizing their gene structure and their expression patterns during flower development. We also aim to identify the minimum promoter sequences of these genes and produce promoter-reporter gene constructs. Increasing knowledge about the roles of the MADS box genes in Passiflora flower development can contribute to a better understanding of the evolution of this genus that presents a wide variation in floral features (corona filaments, androgynophore, etc.).