Seed morphology, life form and distribution in three bromheadia species (Epidendroideae, Orchidaceae)
Entidad
UAM. Departamento de BiologíaEditor
MDPIFecha de edición
2023-02-01Cita
10.3390/d15020195
Diversity 15.2 (2023): 195
ISSN
1424-2818 (online)DOI
10.3390/d15020195Versión del editor
https://doi.org/10.3390/d15020195Materias
Testa Cells; Anticlinal Walls; Embryo; Terrestrial; Epiphyte; Biología y Biomedicina / BiologíaDerechos
© 2023 by the authors. Licensee MDPI, Basel, SwitzerlandResumen
The seed morphology of three species belonging to the genus Bromheadia was analyzed under light and scanning electron microscopy. The seeds of B. cecieliae and B. truncata were studied for the first time. Differences in the qualitative and quantitative characteristics between the terrestrial B. finlaysoniana and the epiphytes B. cecieliae and B. truncata were observed, which were in concordance with the life form. Due to the variability of the seed shapes, a new methodology is proposed to analyze the distance between the embryo and the testa cells, with the aim of demonstrating the presence of air space within the seed. The method is compared to previous formulae used to measure free air space. Furthermore, a new measurement, the angle in twisted testa cells of epiphytic orchids, is proposed, to evaluate the degree of torsion in medial cells. Although the wide distribution of B. finlaysoniana could be related to the great buoyancy of their seeds in contrast to the limited distribution of B. cecieliae, we consider that environmental factors are more influential than the buoyancy of seeds when understanding the distribution of these taxa. Future studies on seeds morphology in orchid genera with terrestrial and epiphytic taxa will provide new insights into this research
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Google Scholar:Ortúñez Rubio, Emma
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Gamarra Gamarra, Roberto
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