Partial and asymmetrical reproductive isolation between two sympatric tropical shrub species: Cnidoscolus aconitifolius and C. souzae (Euphorbiaceae)
Abstract Reproductive isolation is conferred by several barriers that occur at different stages of reproduction. Comprehensive reviews on the topic have identified that barriers occurring prior to zygote formation are often stronger than those that occur afterward. However, the overrepresentation of...
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| Format: | Article |
| Language: | English |
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Wiley
2023-12-01
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| Series: | Ecology and Evolution |
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| Online Access: | https://doi.org/10.1002/ece3.10801 |
| _version_ | 1797373112361156608 |
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| author | Miguel A. Munguía‐Rosas Víctor Parra‐Tabla José M. Rodríguez‐Domínguez |
| author_facet | Miguel A. Munguía‐Rosas Víctor Parra‐Tabla José M. Rodríguez‐Domínguez |
| author_sort | Miguel A. Munguía‐Rosas |
| collection | DOAJ |
| description | Abstract Reproductive isolation is conferred by several barriers that occur at different stages of reproduction. Comprehensive reviews on the topic have identified that barriers occurring prior to zygote formation are often stronger than those that occur afterward. However, the overrepresentation of temperate perennial herbs in the current literature precludes any generalization of this pattern to plants that present other life forms and patterns of distribution. Here, we assessed reproductive isolation barriers and their absolute contribution to reproductive isolation and asymmetry in Cnidoscolus aconitifolius and C. souzae, two closely related tropical shrub species that co‐occur on the Yucatan peninsula. The reproductive barriers assessed were phenological mismatch, pollinator differentiation, pollen–pistil incompatibility (three pre‐zygotic barriers), fruit set failure, and seed unviability (post‐zygotic barriers). Reproductive isolation between the study species was found to be complete in the direction C. aconitifolius to C. souzae, but only partial in the opposite direction. One post‐zygotic barrier was the strongest example. Most barriers, particularly the pre‐zygotic examples, were asymmetrical and predicted the direction of heterospecific pollen flow and hybrid formation from C. souzae to C. aconitifolius. Both parental species, as well as the hybrids, were diploid and had a chromosome number 2n = 36. More studies with tropical woody perennials are required to fully determine whether this group of plants consistently shows stronger post‐zygotic barriers. |
| first_indexed | 2024-03-08T18:45:41Z |
| format | Article |
| id | doaj.art-15b19824921d4ad4bcb2d0e7b5e495f3 |
| institution | Directory Open Access Journal |
| issn | 2045-7758 |
| language | English |
| last_indexed | 2024-03-08T18:45:41Z |
| publishDate | 2023-12-01 |
| publisher | Wiley |
| record_format | Article |
| series | Ecology and Evolution |
| spelling | doaj.art-15b19824921d4ad4bcb2d0e7b5e495f32023-12-29T00:26:15ZengWileyEcology and Evolution2045-77582023-12-011312n/an/a10.1002/ece3.10801Partial and asymmetrical reproductive isolation between two sympatric tropical shrub species: Cnidoscolus aconitifolius and C. souzae (Euphorbiaceae)Miguel A. Munguía‐Rosas0Víctor Parra‐Tabla1José M. Rodríguez‐Domínguez2Laboratorio de Ecología Terrestre, Departamento de Ecología Humana Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (Cinvestav) Mérida MexicoDepartamento de Ecología Tropical Universidad Autónoma de Yucatán Mérida MexicoCentro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco, A.C. Unidad de Biotecnología Vegetal Guadalajara MexicoAbstract Reproductive isolation is conferred by several barriers that occur at different stages of reproduction. Comprehensive reviews on the topic have identified that barriers occurring prior to zygote formation are often stronger than those that occur afterward. However, the overrepresentation of temperate perennial herbs in the current literature precludes any generalization of this pattern to plants that present other life forms and patterns of distribution. Here, we assessed reproductive isolation barriers and their absolute contribution to reproductive isolation and asymmetry in Cnidoscolus aconitifolius and C. souzae, two closely related tropical shrub species that co‐occur on the Yucatan peninsula. The reproductive barriers assessed were phenological mismatch, pollinator differentiation, pollen–pistil incompatibility (three pre‐zygotic barriers), fruit set failure, and seed unviability (post‐zygotic barriers). Reproductive isolation between the study species was found to be complete in the direction C. aconitifolius to C. souzae, but only partial in the opposite direction. One post‐zygotic barrier was the strongest example. Most barriers, particularly the pre‐zygotic examples, were asymmetrical and predicted the direction of heterospecific pollen flow and hybrid formation from C. souzae to C. aconitifolius. Both parental species, as well as the hybrids, were diploid and had a chromosome number 2n = 36. More studies with tropical woody perennials are required to fully determine whether this group of plants consistently shows stronger post‐zygotic barriers.https://doi.org/10.1002/ece3.10801Cnidoscolusheterospecific pollen transferpost‐zygotic reproductive barrierspre‐zygotic reproductive barriersreproductive isolation |
| spellingShingle | Miguel A. Munguía‐Rosas Víctor Parra‐Tabla José M. Rodríguez‐Domínguez Partial and asymmetrical reproductive isolation between two sympatric tropical shrub species: Cnidoscolus aconitifolius and C. souzae (Euphorbiaceae) Ecology and Evolution Cnidoscolus heterospecific pollen transfer post‐zygotic reproductive barriers pre‐zygotic reproductive barriers reproductive isolation |
| title | Partial and asymmetrical reproductive isolation between two sympatric tropical shrub species: Cnidoscolus aconitifolius and C. souzae (Euphorbiaceae) |
| title_full | Partial and asymmetrical reproductive isolation between two sympatric tropical shrub species: Cnidoscolus aconitifolius and C. souzae (Euphorbiaceae) |
| title_fullStr | Partial and asymmetrical reproductive isolation between two sympatric tropical shrub species: Cnidoscolus aconitifolius and C. souzae (Euphorbiaceae) |
| title_full_unstemmed | Partial and asymmetrical reproductive isolation between two sympatric tropical shrub species: Cnidoscolus aconitifolius and C. souzae (Euphorbiaceae) |
| title_short | Partial and asymmetrical reproductive isolation between two sympatric tropical shrub species: Cnidoscolus aconitifolius and C. souzae (Euphorbiaceae) |
| title_sort | partial and asymmetrical reproductive isolation between two sympatric tropical shrub species cnidoscolus aconitifolius and c souzae euphorbiaceae |
| topic | Cnidoscolus heterospecific pollen transfer post‐zygotic reproductive barriers pre‐zygotic reproductive barriers reproductive isolation |
| url | https://doi.org/10.1002/ece3.10801 |
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