Mating system variation and assortative mating of sympatric bromeliads (<i>Pitcairnia</i> spp.) endemic to neotropical inselbergs

Palma‐Silva, Clarisse; Cozzolino, Salvatore; Paggi, Gecele Matos; Lexer, Christian; Wendt, Tânia

doi:10.3732/ajb.1400513

Cited by 26 publications

(34 citation statements)

References 66 publications

(110 reference statements)

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“…(Wagner et al, 2015) and between Aechmea recurvata (Klotzsch) L.B.Sm. One commonly observed pattern, in Pitcairnia (Wendt et al, 2002;Palma-Silva et al, 2015), Fosterella (Wagner et al, 2015) and Vriesea (Neri, 2016), is the importance of the mating system as a reproductive isolation barrier, where autogamy may preclude heterospecific hybridization. (Zhang et al, 2012).…”

Section: Speciation and Hybridizationmentioning

confidence: 99%

Advances in and perspectives on evolution in Bromeliaceae

et al. 2016

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Section: Speciation and Hybridizationmentioning

confidence: 99%

Advances in and perspectives on evolution in Bromeliaceae

et al. 2016

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“…; Palma‐Silva et al . ). Several morphological and ecological divergences have been reported for these species (Wendt et al .…”

Section: Introductionmentioning

confidence: 97%

“…Pitcairnia albiflos is primarily outcrossing but self‐compatible, whereas P. staminea is primarily selfing when in sympatry with P. albiflos (Palma‐Silva et al . ).…”

Section: Introductionmentioning

confidence: 97%

“…; Palma‐Silva et al . , ; and see Fig. S1 for flower details, Supporting information), indicating strong prezygotic reproductive barriers.…”

Section: Introductionmentioning

confidence: 99%

“…Barriers to reproductive isolation between these species are porous, allowing hybridization and asymmetric introgression towards P. albiflos (Palma‐Silva et al . , ). This system is a good example of divergence with gene flow, where neutral or advantageous genes would be able to cross species boundaries (Palma‐Silva et al .…”

Section: Introductionmentioning

confidence: 99%

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De novo assembly and characterization of leaf and floral transcriptomes of the hybridizing bromeliad species (Pitcairnia spp.) adapted to Neotropical Inselbergs

Palma‐Silva

Ferro

Bacci

et al. 2016

Molecular Ecology Resources

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We present the leaf and floral transcriptomes of two hybridizing bromeliad species that differ in their major pollinator systems. Here we identified candidate genes responsible for pollinator attraction and reproductive isolation in these two species. We searched for candidate genes involved in floral traits, such as colour. Approximately 34 Gbp of cDNA sequence data were produced from both tissues and species, resulting in a total of 424 506 914 raw reads. The de novo-assembled transcriptomes consisted of a total of 263 955 contigs, further clustered into 110 977 unigenes. Over 58% of the unigenes were functionally annotated and assigned to one or more Gene Ontology terms. The transcriptomes revealed 144 unique transcripts that encode key enzymes in the flavonoid and anthocyanin biosynthesis pathways. The domain/family annotation and phylogenetic analysis allowed us to infer, by homology, potential functions of the genes encoding MYB, HD-ZIP and bZIP-HY5 transcription factors, as well as WD40 protein, which may be involved in anthocyanin and flavonoid regulation in these species. These candidate genes are associated with natural regulation in flower colour in other plant species and will facilitate future studies aimed at elucidating the molecular basis of adaptive differentiation and the evolution of mechanisms of pollinator-mediated reproductive isolation in these two bromeliads. In addition, we identified a total of 49 439 microsatellite loci. These resources will assist future research into adaptation and speciation events in bromeliad species, thus providing a starting point for investigation of the molecular mechanisms of the traits responsible for their reproductive isolation.

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Speciation with gene flow between two Neotropical sympatric species (Pitcairnia spp.: Bromeliaceae)

Tavares

Ferro

Leal

et al. 2022

Ecology and Evolution

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The study of mechanisms that generate new species is considered fundamental for broad areas of ecology and evolution. Speciation is a continuous process in which reproductive isolation is established, and it is of fundamental importance to understand the origins of the adaptations that contribute to this process. Hybrid zones are considered natural laboratories for the study of speciation and represent ideal systems for such studies. Here, we investigated genomic differentiation between hybridizing Neotropical species Pitcairnia staminea (G. Lodd.) and P. albiflos (Herb.). Using thousands of SNPs genotyped through RAD‐seq, we estimate effective population sizes, interspecific gene flow, as well as time of divergence between these two sister species and identify candidate genomic regions for positive selection that may be related to reproductive isolation. We selected different scenarios of speciation and tested them by using approximate Bayesian computation (ABC); we found evidence of divergence with gradual reduction in gene flow between these species over time, compatible with the hypothesis of speciation with gene flow between these Pitcairnia species. The parameter estimates obtained through ABC suggested that the effective population size of P. albiflos was around three times larger than that of P. staminea . Our divergence date estimates showed that these two species diverged during the Pliocene (4.7 Mya; CI = 1.3–8.5 Mya), which has likely allowed this species to accumulate genome‐wide differences. We also detected a total of 17 of 4165 loci which showed signatures of selection with high genetic differentiation ( F ST > 0.85), 12 of these loci were annotated in de novo assembled transcriptomes of both species, and 4 candidate genes were identified to be putatively involved in reproductive isolation. These four candidate genes were previously associated with the function of pollen development, pollen tube germination and orientation, abiotic stress, and flower scent in plants, suggesting an interplay between pre‐ and postpollination barriers in the evolution of reproductive isolation between such species.

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Mating system variation and assortative mating of sympatric bromeliads (Pitcairnia spp.) endemic to neotropical inselbergs

Cited by 26 publications

References 66 publications

Advances in and perspectives on evolution in Bromeliaceae

Advances in and perspectives on evolution in Bromeliaceae

De novo assembly and characterization of leaf and floral transcriptomes of the hybridizing bromeliad species (Pitcairnia spp.) adapted to Neotropical Inselbergs

Speciation with gene flow between two Neotropical sympatric species (Pitcairnia spp.: Bromeliaceae)

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