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- Title
Multiple pre‐ and postzygotic components of reproductive isolation between two co‐occurring Lysimachia species.
- Authors
Jiménez‐López, Francisco Javier; Arista, Montserrat; Talavera, María; Cerdeira Morellato, Leonor Patrícia; Pannell, John R.; Viruel, Juan; Ortiz Ballesteros, Pedro L.
- Abstract
Summary: Genetic divergence between species depends on reproductive isolation (RI) due to traits that reduce interspecific mating (prezygotic isolation) or are due to reduced hybrid fitness (postzygotic isolation). Previous research found that prezygotic barriers tend to be stronger than postzygotic barriers, but most studies are based on the evaluation of F1 hybrid fitness in early life cycle stages.We combined field and experimental data to determine the strength of 17 prezygotic and postzygotic reproductive barriers between two Lysimachia species that often co‐occur and share pollinators. We assessed postzygotic barriers up to F2 hybrids and backcrosses.The two species showed near complete RI due to the cumulative effect of multiple barriers, with an uneven and asymmetric contribution to isolation. In allopatry, prezygotic barriers contributed more to reduce gene flow than postzygotic barriers, but their contributions were more similar in sympatry.The strength of postzygotic RI was up to three times lower for F1 progeny than for F2 or backcrossed progenies, and RI was only complete when late F1 stages and either F2 or backcrosses were accounted for. Our results thus suggest that the relative strength of postzygotic RI may be underestimated when its effects on late stages of the life cycle are disregarded.
- Subjects
REPRODUCTIVE isolation; LIFE cycles (Biology); GENE flow; SPECIES; VICARIANCE; POLLINATORS
- Publication
New Phytologist, 2023, Vol 238, Issue 2, p874
- ISSN
0028-646X
- Publication type
Article
- DOI
10.1111/nph.18767