Carpellary appendages in Nymphaea and Victoria (Nymphaeaceae) : evidence of their role as osmophores based on morphology, anatomy and ultrastructure
In flowers of Nymphaea and Victoria, carpellary appendages are regarded as structures related to pollination by deceit of night-blooming species. In this study, the anatomy, histochemistry and ultrastructure of carpellary appendages were analysed to investigate their possible role in the production...
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| Autores principales: | , , , , |
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| Formato: | Artículo |
| Lenguaje: | Inglés |
| Publicado: |
Wiley Blackwell Publishing, Inc
2025
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| Acceso en línea: | http://repositorio.unne.edu.ar/handle/123456789/59950 |
| Aporte de: |
| Sumario: | In flowers of Nymphaea and Victoria, carpellary appendages are regarded as structures related to pollination by deceit
of night-blooming species. In this study, the anatomy, histochemistry and ultrastructure of carpellary appendages were
analysed to investigate their possible role in the production of volatile compounds in nocturnal species Nymphaea
amazonum, N. gardneriana, N. prolifera (Nymphaea subgenus Hydrocallis) and Victoria cruziana, and in diurnal
species N. caerulea (Nymphaea subgenus Brachyceras). Carpellary appendages were studied using light microscopy
and scanning and transmission electron microscopy from pre-anthesis to the second day of anthesis. Anatomical and
ultrastructural features are characteristic of osmophores. In all species, the most frequent components in secretory
cells are amyloplasts, lipid bodies, mitochondria, rough endoplasmic reticulum and elaioplasts. The epidermis and
multilayered parenchyma accumulate abundant starch grains and lipophilic substances, both of which vanish during
anthesis. Amorphous substances are deposited between the plasmalemma and the outer cell wall of epidermal cells,
and are then released by cuticular diffusion. Odour production in carpellary appendages might be an ancient role of
primary importance both in diurnal and nocturnal species that are pollinated by deceit. Olfactory and visual cues of
small carpellary appendages in Nymphaea subgenus Brachyceras correspond to bee pollination, and large carpellary
appendages in subgenus Hydrocallis and Victoria represent parallel functional specializations of the flowers to the
attraction and reward for exclusive beetle pollination. |
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