Reproductive isolation and hybridization in sympatric populations of three Dactylorhiza species (Orchidaceae) with different ploidy levels

hert, Koen De; Jacquemyn, Hans; Glabeke, Sabine Van; Roldán‐Ruiz, Isabel; Vandepitte, Katrien; Leus, Leen; Honnay, Olivier

doi:10.1093/aob/mcr305

Cited by 32 publications

(37 citation statements)

References 52 publications

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“…Leaves of D. incarnata are lanceolate, and usually have a hooded leaf tip. Different flowering time and hybrid sterility seems to prevent introgression between D. incarnata and other Dactylorhiza species in the study area (De hert et al 2012). Related Dactylorhiza species do not form a persistent soil seed bank, as indicated by the rapid in situ decay of seed viability, and the vegetative dormancy of tubers is very low (Øien et al 2008;Shefferson 2009).…”

Section: Study Speciesmentioning

confidence: 90%

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Recolonization after habitat restoration leads to decreased genetic variation in populations of a terrestrial orchid

et al. 2012

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Colonization is crucial to habitat restoration projects that rely on the spontaneous regeneration of the original vegetation. However, as a previously declining plant species spreads again, the likelihood of founder effects increases through recurrent population founding and associated serial bottlenecks. We related Amplified Fragment Length Polymorphism markers genetic variation and fitness to colonization history for all extant populations of the outcrossing terrestrial orchid Dactylorhiza incarnata in an isolated coastal dune complex. Around 1970, D. incarnata suffered a severe bottleneck yet ultimately persisted and gradually spread throughout the spatially segregated dune slacks, aided by the restoration of an open vegetation. Genetic assignment demonstrated dispersal to vacant sites from few nearby extant populations and very limited inflow from outside the spatially isolated reserve. Results further indicated that recurrent founding from few local sources resulted in the loss of genetic diversity and promoted genetic divergence (F(ST) = 0.35) among populations, but did not influence population fitness. The few source populations initially available and the limited inflow of genes from outside the study reserve, as a consequence of habitat degradation and spatial isolation, may have magnified the genetic effects of recurrent population founding.

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Section: Study Speciesmentioning

confidence: 90%

Section: Methodsmentioning

confidence: 99%

Recolonization after habitat restoration leads to decreased genetic variation in populations of a terrestrial orchid

et al. 2012

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“…) and even triple hybrids among D. fuchsii (2 n = 40), D. incarnata and D. praetermissa ) (De hert et al. ).…”

Section: Introductionmentioning

confidence: 99%

“…Examples in Orchidaceae are well reported in the literature, especially in the genus Dactiylohriza Neck. ex Nevski on crossings involving D. fuchsii (2n = 40) with D. purpurella and D. praetermissa (both 2n = 80; cited as Dactylorchis in Heslop-Harrison 1953, 1957; D. fuchsii 9 D. maculata (2n = 80) (St ahlberg 2009), D. incarnata (2n = 40) 9 D. praetermissa (De Hert et al 2011) and even triple hybrids among D. fuchsii (2n = 40), D. incarnata and D. praetermissa) (De hert et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Interploidy hybridization in sympatric zones: the formation ofEpidendrum fulgens × E. puniceoluteumhybrids (Epidendroideae,Orchidaceae)

Moraes

Chinaglia

Palma‐Silva

et al. 2013

Ecology and Evolution

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Interspecific hybridization is a primary cause of extensive morphological and chromosomal variation and plays an important role in plant species diversification. However, the role of interploidal hybridization in the formation of hybrid swarms is less clear. Epidendrum encompasses wide variation in chromosome number and lacks strong premating barriers, making the genus a good model for clarifying the role of chromosomes in postzygotic barriers in interploidal hybrids. In this sense, hybrids from the interploidal sympatric zone between E. fulgens (2n = 2x = 24) and E. puniceoluteum (2n = 4x = 56) were analyzed using cytogenetic techniques to elucidate the formation and establishment of interploidal hybrids. Hybrids were not a uniform group: two chromosome numbers were observed, with the variation being a consequence of severe hybrid meiotic abnormalities and backcrossing with E. puniceoluteum. The hybrids were triploids (2n = 3x = 38 and 40) and despite the occurrence of enormous meiotic problems associated with triploidy, the hybrids were able to backcross, producing successful hybrid individuals with broad ecological distributions. In spite of the nonpolyploidization of the hybrid, its formation is a long-term evolutionary process rather than a product of a recent disturbance, and considering other sympatric zones in Epidendrum, these events could be recurrent.

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“…Most studies on plant RI have focused on only one or a few particular barriers to limit interspecific gene flow, although there are exceptions (e.g., Scopece et al ; Baek et al ; Ma et al ). To determine how species boundaries are maintained between hybridizing species, it is important to understand both the causes and results of hybridization (Furches et al ) and the reproductive barriers that determine the relationship between species boundaries and hybridization of taxa (Widmer et al ; De hert et al ).…”

Section: The Strength Of Each Reproductive Barrier Component and Thementioning

confidence: 99%

Natural hybridization and reproductive isolation between twoPrimulaspecies

Xie

Zhu

et al. 2017

JIPB

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Summary Natural hybridization frequently occurs in plants and can facilitate gene flow between species, possibly resulting in species refusion. However, various reproductive barriers block the formation of hybrids and maintain species integrity. Here, we conducted a field survey to examine natural hybridization and reproductive isolation (RI) between sympatric populations of Primula secundiflora and P. poissonii using ten nuclear simple sequence repeat (SSR) loci. Although introgressive hybridization occurred, species boundaries between P. secundiflora and P. poissonii were maintained through nearly complete reproductive isolation. These interfertile species provide an excellent model for studying the RI mechanisms and evolutionary forces that maintain species boundaries.

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Reproductive isolation and hybridization in sympatric populations of three Dactylorhiza species (Orchidaceae) with different ploidy levels

Abstract: Strong post-mating reproductive barriers prevent local breakdown of species boundaries in Dactylorhiza despite frequent hybridization between parental species. However, the presence of triple hybrids indicates that in some cases hybridization may extend the F(1) generation.

Cited by 32 publications

References 52 publications

Recolonization after habitat restoration leads to decreased genetic variation in populations of a terrestrial orchid

Recolonization after habitat restoration leads to decreased genetic variation in populations of a terrestrial orchid

Interploidy hybridization in sympatric zones: the formation ofEpidendrum fulgens × E. puniceoluteumhybrids (Epidendroideae,Orchidaceae)

Natural hybridization and reproductive isolation between twoPrimulaspecies

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