Floral biology and potential hybridization of three sympatric epiphytic bromeliads in Veracruz, Mexico

Ramírez‐Rosas, Kareen; Aguirre‐Jaimes, Armando; Ramírez‐Morillo, Ivón M.; García‐Franco, José G.

doi:10.1111/1442-1984.12279

Cited by 8 publications

(11 citation statements)

References 60 publications

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“…Another study looked at post-pollination barriers among 13 species of bromeliads and found that despite pollen tube growth inhibition being an important mechanism, nearly 25% of interspecific and intergeneric crosses lead to normal pollen tube growth (Matallana et al, 2016). Additionally, three sympatric species of Tillandsia in Mexico showed overlap in flowering time, similarity in reproductive organs morphology and manual crosses among them resulted in high fruit production and viable seeds (Ramírez-Rosas et al, 2020). There is further morphological and genetic evidence for natural introgression or hybrid speciation in several bromeliad genera, including…”

Section: Hybridization As a Widespread Phenomenon In Bromeliaceaementioning

confidence: 99%

Genome Skimming Reveals Widespread Hybridization in a Neotropical Flowering Plant Radiation

et al. 2021

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The tropics hold at least an order of magnitude greater plant diversity than the temperate zone, yet the reasons for this difference are still subject to debate. Much of tropical plant diversity is in highly speciose genera and understanding the drivers of such high species richness will help solve the tropical diversity enigma. Hybridization has recently been shown to underlie many adaptive radiations, but its role in the evolution of speciose tropical plant genera has received little attention. Here, we address this topic in the hyperdiverse Bromeliaceae genus Vriesea using genome skimming data covering the three genomic compartments. We find evidence for hybridization in ca. 11% of the species in our dataset, both within the genus and between Vriesea and other genera, which is commensurate with hybridization underlying the hyperdiversity of Vriesea, and potentially other genera in Tillandsioideae. While additional genomic research will be needed to further clarify the contribution of hybridization to the rapid diversification of Vriesea, our study provides an important first data point suggesting its importance to the evolution of tropical plant diversity.

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Section: Hybridization As a Widespread Phenomenon In Bromeliaceaementioning

confidence: 99%

Genome Skimming Reveals Widespread Hybridization in a Neotropical Flowering Plant Radiation

et al. 2021

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“…Moreover, different from the results observed in the present study, these authors reported low viability of V. minarum seeds. In a study that investigated the hybridization potential in Tillandsia species, a significant variation in the germinative potential of these species was reported, which was directly related to interspecific crosses (RAMÍREZ-ROSAS et al, 2020).…”

Section: Resultsmentioning

confidence: 99%

“…(NERI; WENDT; PALMA-SILVA, 2018), Tillandsia sp. (RAMÍREZ-ROSAS et al, 2020), and others. In this context, the information about morphological characterization of fruits and seeds of Quesnelia quesneliana is scarce.…”

Section: Introductionmentioning

confidence: 95%

FRUIT AND SEED MORPHOLOGY, AND GERMINATION OF Quesnelia quesneliana (BRONGNIART) L.B. SMITH

et al. 2022

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Bromeliad Quesnelia quesneliana (Brongniart) L.B. Smith has been reported in the Atlantic Forest, Rainforest, Mesophilic Semideciduous Seasonal Forest, Mangroves and Restingas in the Brazilian southeastern states of Rio de Janeiro and Espírito Santo, but information about their fruit and seed morphology, and germination is limited. The aim of this study was to characterize the external morphology of fruit and seeds, germination rate and post-seminal stages of Q. quesneliana. Fruits were collected from Restinga area in the Armação dos Búzios city, Rio de Janeiro, Brazil. The width and length of fruit and seeds (external morphology) were measured, the post-seminal development of the seeds was analyzed and botanical illustrations were made. The indexes t50, uniformity of germination, mean germination time and germination speed coefficient were also calculated. Germination was assessed for 20 days by counting individuals to obtain the post-seminal stages. Ripe Q. quesneliana fruits are pyriform, reddish-brown in color, with light spots, 26 mm long and 10 mm wide, with an average of 148 seeds per fruit and wrapped in a transparent mucilage. The seeds are 2 mm long and 1 mm wide, with epigeal germination, and its seedlings are cryptocotyledonary. The seeds of this species germinate quickly and have no dormancy.

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“…Moreover, pollen–pistil incompatibility has been shown to act as postpollination barrier in other closely related plant species occurring in sympatry (e.g., Opuntia elata and O. retorsa : Fachardo & Sigrist, 2020 ; Streptanthus breweri and S. hesperidis : Christie & Strauss, 2019 ). Therefore, pollen–pistil incompatibility as reproductive isolation barrier was suggested to be responsible in maintaining species boundaries in assemblages of sympatric bromeliad species (Cavalcante et al, 2020 ; Matallana et al, 2016 ; Ramírez‐Rosas et al, 2020 ).…”

Section: Discussionmentioning

confidence: 99%

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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Floral biology and potential hybridization of three sympatric epiphytic bromeliads in Veracruz, Mexico

Cited by 8 publications

References 60 publications

Genome Skimming Reveals Widespread Hybridization in a Neotropical Flowering Plant Radiation

Genome Skimming Reveals Widespread Hybridization in a Neotropical Flowering Plant Radiation

FRUIT AND SEED MORPHOLOGY, AND GERMINATION OF Quesnelia quesneliana (BRONGNIART) L.B. SMITH

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

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