Here, we combined ultrastructural analysis and expression patterns of the flower meristem and floral organ identity genes of the MADS-box AP1/ FUL clade to reveal a possible role for these genes in the generation of evolutionary novelties in Passiflora. Although some work on Passiflora organ ontogeny has been done, the developmental identity of both Passiflora tendrils and the corona is still controversial. Passionflowers are also recognized by their unique flower features, such as the extra whorls of floral organs composed of corona filaments and membranes enclosing the nectary. They are mostly perennial climbers that display axillary tendrils, which are believed to be modifications of the inflorescence. Passiflora (passionflowers) makes an excellent model for studying plant evolutionary development.
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