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Fig. 2 | EvoDevo

Fig. 2

From: Expression patterns of Passiflora edulis APETALA1/FRUITFULL homologues shed light onto tendril and corona identities

Fig. 2

Passiflora edulis shoot apical behaviour. a Schematic representation of typical P. edulis phytomers in the juvenile, transition and reproductive stages. b–i SEM of P. edulis developing organs at different stages. b Top view of the shoot apex of a juvenile plant. Leaves primordia (l1–l3) develop in spiral phyllotaxy from the apical meristem (am) and are numbered according to the order they arise, so l1 is the youngest leaf. Two stipules (s1–s3) are formed laterally to each leaf primordium. A vegetative bud (vb) is observed in the axil of the third leaf (l3). c Top view of the apex of a plant in the adult transition stage, where the tendril primordium (tp) develops from the third leaf axillary meristem. d Top view of the apex of a plant in the adult reproductive stage. Here, the axillary meristem (black arrow), which appears as a dome-shaped bump in the axil of the fourth leaf (l4), will produce a tendril and a flower. In the fifth leaf (l5), we can observe the first bract primordium (bp) that covers the flower meristem (white arrow) and the tendril primordium (tp). e Details of the leaf (le) axil in the juvenile stage where only the vegetative bud develops (vb) in between the two stipules (sl). f, g Details of the vegetative bud developing in the region between the tendril (te) insertion and the stem in the adult transition stage. h Details of the leaf axil where the tendril (te), the flower (represented by the presence of three bracts br) and the vegetative bud (vb) developing in the reproductive stage. i The final position of the structures in the leaf (le) axil is visualized. The tendril (te) was removed to visualize the flower bud (fb) that is developing enclosed by the three bracts (br), and the vegetative bud (vb) is positioned between the flower-tendril complex and the stem (st) Bars: b, c, f = 100 µm; d, e, g, h = 200 µm; i = 1 mm

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