The reproductive success of a Quercus petraea × Q. robur F1-hybrid in back-crossing situations

Olrik, Ditte C.; Kjær, Erik Dahl

doi:10.1051/forest:2006086

Cited by 20 publications

(22 citation statements)

References 20 publications

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“…On the other hand, incompatibilities between F 1 hybrids and one or both parental species appeared to be reduced potentially facilitating gene fl ow between sympatric species with partial incompatibilities. For example, a rare Q. petraea x Q. robur F 1 hybrid could be backcrossed effi ciently with both parents possibly allowing nuclear gene fl ow from Q. robur to Q. petraea (Olrik & Kjaer 2007). Likewise, seeds collected from a hybrid between Q. lobata and Q. douglasii were fathered by both Q. lobata (37%) and Q. douglasii (63%), while only seven out of 394 Q. lobata acorns had mixed ancestry (Abraham et al 2011).…”

Section: Experimental Interspecific Crossesmentioning

confidence: 99%

“…However, cross-compatibility between F 1 hybrids and pure species (Olrik & Kjaer 2007, Lepais & Gerber 2011 suggested that reduced incompatibilities in hybrids might be a route for interspecifi c gene fl ow. Accordingly, a gene fl ow analysis in the four European white oak species Q. robur, Q. petraea, Q. pubsecens and Q. pyrenaica suggested that rare F 1 hybrids are compatible and show a high fi delity to both parental species, thus enabling gene fl ow between species, but preventing the evolution of hybrids swarms (Lepais & Gerber 2011).…”

Section: Gene Flow Analyses In Mixed Oak Standsmentioning

confidence: 99%

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Interspecific gene flow and maintenance of species integrity in oaks

Gailing

Curtu

2014

Ann. For. Res.

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Abstract. Oak species show a wide variation in morphological and physiological characters, and boundaries between closely related species are often not clear-cut. Still, despite frequent interspecific gene flow, oaks maintain distinct morphological and physiological adaptations. In sympatric stands, spatial distribution of species with different ecological requirements is not random but constrained by soil and other micro-environmental factors. Here, we discuss factors that may influence the maintenance of the integrity of oak species in the face of interspecific gene flow. Pre-zygotic isolation (e.g. cross incompatibilities, asynchrony in flowering, pollen competition) and post-zygotic isolation (divergent selection) contribute to the maintenance of species integrity in sympatric oak stands. The antagonistic effects of interspecific gene flow and divergent selection are reflected in the low genetic differentiation between hybridizing oak species at most genomic regions interspersed by regions with signatures of divergent selection (outlier regions). In the near future, the availability of high-density genetic linkage maps anchored to scaffolds of a sequenced Q. robur genome will allow to characterize the underlying genes in these outlier regions and their putative role in reproductive isolation between species. Reciprocal transplant experiments of seedlings between parental environments can be used to characterize selection on outlier genes. High transferability of gene-based markers will enable comparative outlier screens in different oak species.

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Section: Experimental Interspecific Crossesmentioning

confidence: 99%

Section: Gene Flow Analyses In Mixed Oak Standsmentioning

confidence: 99%

Interspecific gene flow and maintenance of species integrity in oaks

Gailing

Curtu

2014

Ann. For. Res.

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“…Particularly, it has been documented that habitat conditions (Williams and Ehleringer 2000;Williams et al 2001;Himrane et al 2004;Lagache et al 2013), geographical localization of the hybrid zone (Tovar-Sánchez and Oyama 2004), establishment and survivorship of hybrid individuals (ValbuenaCarabana et al 2007), different rates of gene flow (Curtu et al 2007), relative abundance and identity of species (Lepais et al 2009), spatial structure of species (Salvini et al 2009), or proportion of conspecific pollen and the density of individuals available to mating (Lagache et al 2013) can influence the levels of hybridization and introgression in oaks. Also, recent studies have reported that the reproductive barriers that operate among oak species involved in hybridization events changes between species pair (Curtu et al 2007;Jensen et al 2009;Lepais et al 2009Lepais et al , 2013, depending on which species act as maternal or paternal parental (Boavida et al 2001;Olrik and Kjaer 2007;Lepais et al 2013) and in response to environmental variation (Lepais and Gerber 2011;Abadie et al 2012;Lepais et al 2013). In consequence, variation in the richness of the local oak community and in ecological and geographical factors among sites could promote differences in the occurrence, types of hybrids and their frequency.…”

Section: Introductionmentioning

confidence: 98%

Hybridization of Quercus castanea (Fagaceae) across a red oak species gradient in Mexico

et al. 2014

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Interspecific gene flow between more than two species is a common phenomenon in oaks, which can occur simultaneously among different species, promoting the transfer of genetic material across species boundaries. However, the hybridization dynamics in multispecies hybrid zones remain unknown. In this study, we provide genetic evidence of hybridization and introgression of Quercus castanea across a natural gradient of red oak species richness. We analyzed five populations recognized morphologically as ''pure'' Q. castanea, one allopatric and four sympatric populations, where the number of red oak species associated with Q. castanea ranged from one to four. Also, one allopatric population of each red oak species that occurs in sympatry with Q. castanea was chosen as reference population (Q. crassipes, Q. laurina, Q. mexicana and Q. crassifolia). In total, six nSSRs were used in 10 and 20 individuals from each allopatric and sympatric populations, respectively. Our results showed that allopatric populations formed completely distinct genetic clusters.In sympatric populations, we found evidence of hybridization and introgression among Q. castanea and three of its associated red oak species. However, the occurrence and frequency of hybrids between Q. castanea and these species varied among stands. Our analyses provide evidence and new insights into hybridization and introgression dynamics within a Mexican red oak species complex, through a focal species, Q. castanea.

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“…Artificial crosses involving F1s and the parental species would help determine the direction of introgression and the nature of barriers to random mating. For instance, Olrik and Kjaer (2007) showed that Q. robur-Q. petraea unidirectional hybridization does not imply necessarily asymmetric backcrossing to the parental species, after performing controlled crosses with an F1 tree of known pedigree.…”

Section: Detection Of Hybrids In Oaksmentioning

confidence: 99%

Detection of hybrids in nature: application to oaks (Quercus suber and Q. ilex)

et al. 2009

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Powerful and accurate detection of first-generation (F1) hybrids and backcrosses in nature is needed to achieve a better understanding of the function and dynamics of introgression. To document the frequency of ongoing interspecific gene exchange between two Mediterranean evergreen oaks, the cork oak (Quercus suber) and the holm oak (Q. ilex), we analyzed 1487 individuals originating from across the range of the two species using eight microsatellite loci and two Bayesian clustering approaches (implemented in the programs STRUCTURE and NEWHY-BRIDS). Simulated data were used to assess the differences between the two clustering methods and to back up the choice of the threshold value for the posterior probability to discriminate admixed from pure individuals. We found that the use of STRUCTURE resulted in the highest power to detect hybrids, whereas NEWHYBRIDS provided the highest accuracy. Irrespective of the approach, the two species were clearly distinguished as independent genetic entities without any prior information. In contrast with previous reports, we found no evidence for unidirectional introgression. The overall hybridization rate was very low (o2% of introgressed individuals). Only two individuals were identified as F1 hybrids and five as early backcrosses. This work shows that the combined application of the two complementary Bayesian approaches and their systematic validation with simulations, fit for the case at hand, helps gain resolution in the identification of admixed individuals.

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The reproductive success of a Quercus petraea × Q. robur F1-hybrid in back-crossing situations

Cited by 20 publications

References 20 publications

Interspecific gene flow and maintenance of species integrity in oaks

Interspecific gene flow and maintenance of species integrity in oaks

Hybridization of Quercus castanea (Fagaceae) across a red oak species gradient in Mexico

Detection of hybrids in nature: application to oaks (Quercus suber and Q. ilex)

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