Evidence of 2n microspore production in a natural diploid population of Turnera sidoides subsp. carnea and its relevance in the evolution of the T. sidoides (Turneraceae) autopolyploid complex
Turnera sidoides is a complex of distylous perennial rhizomatous herbs that includes five subspecies. Since polyploidy has played a prominent role within this species (x = 7), ongoing studies in T. sidoides are focused on the understanding of the mechanisms involved in the origin and the establishm...
Guardado en:
| Autores principales: | , |
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| Formato: | Artículo |
| Lenguaje: | Inglés |
| Publicado: |
Sociedad Botánica de Japón
2025
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| Materias: | |
| Acceso en línea: | http://repositorio.unne.edu.ar/handle/123456789/59374 |
| Aporte de: |
| Sumario: | Turnera sidoides is a complex of distylous perennial rhizomatous herbs that includes five subspecies.
Since polyploidy has played a prominent role within this species (x = 7), ongoing studies in T. sidoides are focused
on the understanding of the mechanisms involved in the origin and the establishment of polyploids. Therefore,
aiming to contribute to the understanding of the mode of polyploid formation, in this study we investigated the fre-
quency of unreduced microspores in a natural diploid population of T. sidoides subsp. carnea by analyzing the
size range of pollen and the constitution of the sporads. The results showed that some of the individuals studied
produced 2n and 4n microspores, both in short- and long-styled floral morphs. The analysis performed documents
the production of unreduced microspores in T. sidoides subsp. carnea and provides evidence that support the
hypothesis of sexual polyploidization as one of the most probable mechanisms involved in the origin of polyploids
within this species complex. The role of unreduced pollen in the establishment and persistence of newly formed
polyploids in diploid populations of T. sidoides is also discussed. |
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