Morpho-anatomical characterization of seeds and seedlings of Passiflora caerulea, P. mooreana and P. morifolia (Passifloraceae): Morfo-anatomía de semillas y plántulas de Passiflora
Nine native species of Passiflora with attractive ornamental value, edible fruits and medicinal use grow in Córdoba, Argentina. The aim of this work was to characterize the seeds and seedlings morpho-anatomy of Passiflora caerulea, P. mooreana and P. morifolia. Seeds were collected from natural plant populations and the seedlings were obtained by germination tests. Temporary and permanent anatomical preparations were made. The analyses of different structures were performed by conventional stereoscopic, optical and scanning electron microscopy techniques. The three species presented the seeds completely surrounded by a funicular aril that grows towards the chalaza and that differed by their shape and color. The seed coat was characterized by the reticulate-foveate pattern, and includes three layers in both the testa and tegmen. The exotesta and mesotesta are formed by parenchymatous cells and the endotesta with lignified internal face cells. The exotegmen has macrosclereids in a sinuous pattern; mesotegmen and endotegmen have radially flattened cells. The analyzed species presented spatulate embryo in axile position immersed in a conspicuous ruminated endosperm. The germination of the three species is epigeal, phanerocotylar and seedlings showed similar anatomical features; in contrast, the morphology of their nomophylls, extrafloral nectaries, stipules, stomata placement and presence of trichomes varies considerably from each species. The described morpho-anatomical characteristics allow differentiating seeds and seedlings of the studied species, and provide important differential features to complete the characterization of Passiflora.
| Main Authors: | , , , |
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| Format: | Digital revista |
| Language: | spa |
| Published: |
Fundación Miguel Lillo
2022
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| Online Access: | https://www.lillo.org.ar/journals/index.php/lilloa/article/view/1665 |
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| Summary: | Nine native species of Passiflora with attractive ornamental value, edible fruits and medicinal use grow in Córdoba, Argentina. The aim of this work was to characterize the seeds and seedlings morpho-anatomy of Passiflora caerulea, P. mooreana and P. morifolia. Seeds were collected from natural plant populations and the seedlings were obtained by germination tests. Temporary and permanent anatomical preparations were made. The analyses of different structures were performed by conventional stereoscopic, optical and scanning electron microscopy techniques. The three species presented the seeds completely surrounded by a funicular aril that grows towards the chalaza and that differed by their shape and color. The seed coat was characterized by the reticulate-foveate pattern, and includes three layers in both the testa and tegmen. The exotesta and mesotesta are formed by parenchymatous cells and the endotesta with lignified internal face cells. The exotegmen has macrosclereids in a sinuous pattern; mesotegmen and endotegmen have radially flattened cells. The analyzed species presented spatulate embryo in axile position immersed in a conspicuous ruminated endosperm. The germination of the three species is epigeal, phanerocotylar and seedlings showed similar anatomical features; in contrast, the morphology of their nomophylls, extrafloral nectaries, stipules, stomata placement and presence of trichomes varies considerably from each species. The described morpho-anatomical characteristics allow differentiating seeds and seedlings of the studied species, and provide important differential features to complete the characterization of Passiflora. |
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