The role of triploids in the origin and evolution of polyploids of Turnera sidoides complex (Passifloraceae, Turneroideae)
Triploids can play an important role in polyploid evolution. However, their frequent sterility is an obstacle for the origin and establishment of neotetraploids. Here we analyzed the microsporogenesis of triploids (x = 7) and the crossability among cytotypes of Turnera sidoides, aiming to test the i...
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Sociedad Botánica de Japón
2025
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| Acceso en línea: | http://repositorio.unne.edu.ar/handle/123456789/59373 |
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I48-R184-123456789-593732025-12-15T12:03:58Z The role of triploids in the origin and evolution of polyploids of Turnera sidoides complex (Passifloraceae, Turneroideae) Kovalsky, Evelin Ivana Roggero Luque, Juan Manuel Elías, Gabriela Fernández, Silvia Andrea Solís Neffa, Viviana Griselda Cytotype crossability Microsporogenesis Polyploidy Triploids Triploids can play an important role in polyploid evolution. However, their frequent sterility is an obstacle for the origin and establishment of neotetraploids. Here we analyzed the microsporogenesis of triploids (x = 7) and the crossability among cytotypes of Turnera sidoides, aiming to test the impact of triploids on the origin and demographic establishment oftetraploids in natural populations. Triploids of T. sidoides exhibit irregular meiotic behavior. The high frequency of monovalents and of trivalents with non-convergent orientations results in unbalanced and/or non-viable male gametes. In spite of abnormalities in chromosome pairing and unbalanced chromosome segregation, triploids are not completely sterile and yielded up to 67% of viable pollen. Triploids that originated by the fusion of 2n ×n gametes of the same taxon showed more regular meiotic behavior and higher fertility than triploids from the contact zone of diploids and tetraploids or triploids of hybrid origin. The reproductive isolation of T. sidoides cytotypes of different ploidy level is not strict and the ‘triploid block’ may be overcome occasionally. Triploids of T. sidoides produce diploid and triploid progeny suggesting that new generations of polyploids could originate from crosses between triploids or from backcrosses with diploids. The capability of T. sidoides to multiply asexually by rhizomes, would enhance the likelihood that a low frequency of neopolyploids can be originated and maintained in natural populations of T. sidoides. 2025-12-15T11:33:05Z 2025-12-15T11:33:05Z 2017-08-22 Artículo Kovalsky, Evelin Ivana, et al., 2018. The role of triploids in the origin and evolution of polyploids of Turnera sidoides complex (Passifloraceae, Turneroideae). Journal of Plant Research. Sakai: Sociedad Botánica de Japón, vol. 131, p. 77-89. E-ISSN 1618-0860. DOI https://doi.org/10.1007/s10265-017-0974-9 0918-9440 http://repositorio.unne.edu.ar/handle/123456789/59373 en https://doi.org/10.1007/s10265-017-0974-9 restrictedAccess http://creativecommons.org/licenses/by-nc-nd/2.5/ar/ application/pdf p. 77-89 application/pdf Sociedad Botánica de Japón Journal of Plant Research, 2018, vol. 131, p. 77-89. |
| institution |
Universidad Nacional del Nordeste |
| institution_str |
I-48 |
| repository_str |
R-184 |
| collection |
RIUNNE - Repositorio Institucional de la Universidad Nacional del Nordeste (UNNE) |
| language |
Inglés |
| topic |
Cytotype crossability Microsporogenesis Polyploidy Triploids |
| spellingShingle |
Cytotype crossability Microsporogenesis Polyploidy Triploids Kovalsky, Evelin Ivana Roggero Luque, Juan Manuel Elías, Gabriela Fernández, Silvia Andrea Solís Neffa, Viviana Griselda The role of triploids in the origin and evolution of polyploids of Turnera sidoides complex (Passifloraceae, Turneroideae) |
| topic_facet |
Cytotype crossability Microsporogenesis Polyploidy Triploids |
| description |
Triploids can play an important role in polyploid evolution. However, their frequent sterility is an obstacle for the origin and establishment of neotetraploids. Here we analyzed the microsporogenesis of triploids (x = 7) and the crossability among cytotypes of Turnera sidoides, aiming to test the impact of triploids on the origin and demographic establishment oftetraploids in natural populations. Triploids of T. sidoides exhibit irregular meiotic behavior. The high frequency of monovalents and of trivalents with non-convergent orientations results in unbalanced and/or non-viable male gametes. In spite of abnormalities in chromosome pairing and unbalanced chromosome segregation, triploids are not completely sterile and yielded up to 67% of viable pollen. Triploids that originated by the fusion of 2n ×n gametes of the same taxon showed more regular meiotic behavior and higher fertility than triploids from the contact zone of diploids and tetraploids or triploids of hybrid origin. The reproductive isolation of T. sidoides cytotypes of different ploidy level is not strict and the ‘triploid block’ may be overcome occasionally. Triploids of T. sidoides produce diploid and triploid progeny suggesting that new generations of polyploids could originate from crosses between triploids or from backcrosses with diploids. The capability of T. sidoides to multiply asexually by rhizomes, would enhance the likelihood that a low frequency of neopolyploids can be originated and maintained in natural populations of T. sidoides. |
| format |
Artículo |
| author |
Kovalsky, Evelin Ivana Roggero Luque, Juan Manuel Elías, Gabriela Fernández, Silvia Andrea Solís Neffa, Viviana Griselda |
| author_facet |
Kovalsky, Evelin Ivana Roggero Luque, Juan Manuel Elías, Gabriela Fernández, Silvia Andrea Solís Neffa, Viviana Griselda |
| author_sort |
Kovalsky, Evelin Ivana |
| title |
The role of triploids in the origin and evolution of polyploids of Turnera sidoides complex (Passifloraceae, Turneroideae) |
| title_short |
The role of triploids in the origin and evolution of polyploids of Turnera sidoides complex (Passifloraceae, Turneroideae) |
| title_full |
The role of triploids in the origin and evolution of polyploids of Turnera sidoides complex (Passifloraceae, Turneroideae) |
| title_fullStr |
The role of triploids in the origin and evolution of polyploids of Turnera sidoides complex (Passifloraceae, Turneroideae) |
| title_full_unstemmed |
The role of triploids in the origin and evolution of polyploids of Turnera sidoides complex (Passifloraceae, Turneroideae) |
| title_sort |
role of triploids in the origin and evolution of polyploids of turnera sidoides complex (passifloraceae, turneroideae) |
| publisher |
Sociedad Botánica de Japón |
| publishDate |
2025 |
| url |
http://repositorio.unne.edu.ar/handle/123456789/59373 |
| work_keys_str_mv |
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