TAILIEUCHUNG - Floral function in relation to floral structure in two Periploca species (Periplocoideae) Apocynaceae

This study comprises an investigation into the floral function in relation to the floral structure of Periploca aphylla and P. angustifolia, using light and scanning electron microscopy. Both species display the following floral structures: style-head bearing pollen translators, shelf-like nectaries, staminal feet, nectar-collecting troughs, trisegmented corolline corona lobes and corolla lobe and anthers and nectaries covered by unicellular hairs. | Turkish Journal of Botany Turk J Bot (2015) 39: 653-663 © TÜBİTAK doi: Research Article Floral function in relation to floral structure in two Periploca species (Periplocoideae) Apocynaceae 1, 2 Samia HENEIDAK *, Yougasphree NAIDOO Botany Department, Faculty of Science, Suez University, Suez, Egypt 2 School of Life Sciences, University of KwaZulu-Natal, Durban, South Africa 1 Received: Accepted/Published Online: Printed: Abstract: This study comprises an investigation into the floral function in relation to the floral structure of Periploca aphylla and P. angustifolia, using light and scanning electron microscopy. Both species display the following floral structures: style-head bearing pollen translators, shelf-like nectaries, staminal feet, nectar-collecting troughs, trisegmented corolline corona lobes and corolla lobes, and anthers and nectaries covered by unicellular hairs. Lateral segments of adjacent corona lobes are fused with half of the adaxial base of the adjacent corolla lobes, creating openings through which pollinators can reach the nectar-collecting troughs in the corolla base. Flowers are rotate with spreading corolla lobes and exposed gynostegium, thus sorting in the open-access fly pollination system. The following features are useful to distinguish the flowers of the two species: corolla color, presence or absence of long unicellular hairs and white spots size on the adaxial surface of corolla lobes, translator length, pollen tetrads color, and presence or absence of linear tetrads. It seems that the floral modifications of the two Periploca species serve to optimize pollination efficiency by attracting a wide number of pollinators, thus enhancing the pollination success of plants. Key words: Corolline corona, nectar trough, open-access pollination, pollen tetrads, shelf-like nectaries, spathulate translators, staminal feet 1. Introduction The .

• Nông nghiệp
• Corolline corona
• Nectar trough
• Open access pollination
• Pollen tetrads
• Shelf like nectaries
• Spathulate translators
• Staminal feet