Contributions to the morphological and physiological knowledge of reproduction by seeds of Zephyranthes tubispatha (Amaryllidaceae)
Background and aims: Zephyranthes tubispatha is a South American species with ornamental and pharmacological potential. It was proposed to complete the knowledge of its reproduction by seeds, regarding 1) attributes of fruits, seeds, seed-seedling transition substages, normal and abnormal seedlings;...
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| Autores principales: | , , , |
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| Formato: | Artículo revista |
| Lenguaje: | Español |
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Sociedad Argentina de Botánica
2023
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| Materias: | |
| Acceso en línea: | https://revistas.unc.edu.ar/index.php/BSAB/article/view/40185 |
| Aporte de: |
| Sumario: | Background and aims: Zephyranthes tubispatha is a South American species with ornamental and pharmacological potential. It was proposed to complete the knowledge of its reproduction by seeds, regarding 1) attributes of fruits, seeds, seed-seedling transition substages, normal and abnormal seedlings; 2) germination due to the effect of different storage periods, seeding times, and exposure to supra-optimal temperatures; and 3) plant vigor.
M&M: Samples harvested between 2018 and 2022 (Buenos Aires, Argentina) were used. Fruits and seeds were characterized morphometrically and seminal reserves histochemically. Substages during the seed-seedling transition were defined, and normal and abnormal seedlings were morphologically described. The germination of seeds from different storage periods, seeding times, and thermal conditions was evaluated. Changes in seed viability, electrolyte loss, and plant vigor were studied.
Results: The dimensions of fruits and the number of seeds differed from those reported in the literature, and coincided in color and seminal texture. Lipids and proteins were detected as endosperm reserves. Five seed-seedling transition substages were described as normal and abnormal seedlings. Seeds of up to 10 months of storage, different seeding times and thermal conditions presented high germination percentages. High temperatures thermoinhibited germination, but did not affect subsequent plant survival.
Conclusions: Storage for more than one year showed increased seed mortality and seedling anomalies. The seeding moment conditioned the germination response to the heat treatments, and thermoinhibition did not affect the vigor of the plants produced. |
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