Floral nectary structure, nectar presentation and morpho-anatomical analysis of male-fertile and male-sterile anthers in onion (Allium cepa, Amaryllidaceae)
Background and aims: The onion (Allium cepa var. cepa) is an allogamous species in which male-sterile lines have been developed. However, the structure of the flower and floral nectaries have only been briefly described. The objective of this study is to update the floral anatomy data, comparing...
Guardado en:
| Autores principales: | , , , |
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| Formato: | Artículo |
| Lenguaje: | Inglés |
| Publicado: |
Sociedad Argentina de Botánica
2024
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| Materias: | |
| Acceso en línea: | http://repositorio.unne.edu.ar/handle/123456789/55685 |
| Aporte de: |
| Sumario: | Background and aims: The onion (Allium cepa var. cepa) is an allogamous species in
which male-sterile lines have been developed. However, the structure of the flower
and floral nectaries have only been briefly described. The objective of this study is
to update the floral anatomy data, comparing the gynoecium and androecium of
male-fertile and male-sterile lines, and to analyze the three-dimensional structure
of the floral nectary.
M&M: Conventional optical and scanning electron microscopy techniques were used.
Results: Fertile and sterile male flowers have the same structural organization. The
septal or gynopleural nectary is organized in three zones: 1) production area formed
by the glandular tissue arranged radially in the septa of the ovary, 2) discharge
zone: a small channel at the apex connects the nectariferous tissue with the pocket
formed between the ovary wall and the overlying ridge, and 3) presentation and
harvest zone, where the excreted nectar accumulates, formed between the widened
base of the inner staminal filaments opposite the ovary.
Conclusions: The only anatomical differences in the flowers sterile male lines are
the lack of pollen production and the absence of dehiscence, despite having a
normal stomium and anther wall. The floral nectaries of onion are a clear example
of secondary presentation of nectar. |
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