Using joint multivariate analyses of leaf morphology and molecular-genetic markers for taxon identification in three hybridizing European white oak species (Quercus spp.)

Rellstab, Christian; Bühler, Andreas; Graf, René; Folly, Catherine; Gugerli, Félix

doi:10.1007/s13595-016-0552-7

Cited by 34 publications

(46 citation statements)

References 41 publications

(52 reference statements)

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“…In the case of oaks, the recently proposed validated multiplexes of microsatellites were used mostly to study mating patterns (Lagache et al, 2014), interspecific hybridization processes (Lander et al, 2013) or species identification (Neophytou, 2013;Rellstab et al, 2016) rather than genetic diversity (Curtu et al, 2015;Moracho et al, 2016). Nevertheless, the levels of population genetic parameters found in our study were similar to those observed by other authors (Streiff et al, 1998;Cottrell et al, 2003;Curtu et al, 2015).…”

Section: Discussionsupporting

confidence: 87%

Genetic Insights into Ecological Succession from Oak- (Quercus robur L.) to Beech- (Fagus sylvatica L.) Dominated Forest Stands

Sandurska¹,

Ulaszewski²,

Burczyk³

2017

Acta Biologica Cracoviensia S. Botanica

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Genetic diversity is often considered a major determinant of long term population persistence and its potential to adapt to variable environmental conditions. The ability of populations to maintain their genetic diversity across generations seems to be a major prerequisite for their sustainability, which is particularly important for keystone forest tree species. However, little is known about genetic consequences of demographic alterations occurring during natural processes of ecological succession involving changes in the species composition. Using microsatellites, we investigated genetic diversity of adult and offspring generations in beech (Fagus sylvatica L.) and oak (Quercus robur L.) populations coexisting in a naturally established old-growth forest stand, showing some symptoms of ongoing ecological succession from oak-to beech-dominated forest. In general, adult generations of both species exhibited high levels of genetic diversity (0.657 for beech; 0.821 for oak), which, however, depended on the sets of selected genetic markers. Nevertheless, several symptoms such as differences in genetic diversity indices between generations, significant levels of inbreeding (up to 0.029) and low estimates of effective population size (48-80) confirmed the declining status of the oak population. On the other hand, the uniform distribution of genetic diversity indices across generations, low levels of inbreeding (0.004), low genetic differentiation among adults and offspring and, most importantly, large estimates of effective population size (119-716), all supported beech as a successive and successful tree species in the studied forest stand.

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Section: Discussionsupporting

confidence: 87%

Genetic Insights into Ecological Succession from Oak- (Quercus robur L.) to Beech- (Fagus sylvatica L.) Dominated Forest Stands

Sandurska¹,

Ulaszewski²,

Burczyk³

2017

Acta Biologica Cracoviensia S. Botanica

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“…Earlier phylogenetic reconstruction considering temperate white oaks were unable to resolve the relationship between our four species (Bellarosa et al ., ; Denk & Grimm, ; Hubert et al ., ). However, recent genetic survey conducted with genetic markers highlighted closer genetic relationships between Quercus pubescens and Q. petraea (Curtu et al ., ; Lepais et al ., ; Neophytou et al ., ; Rellstab et al ., ). These results were also confirmed by phenetic analysis based on leaf morphological features showing that Q. pubescens and Q. petraea share strong leaf morphological similarities in contrast to Q. pyrenaica and Q. robur (Viscosi et al ., ).…”

Section: Discussionmentioning

confidence: 97%

Extensive recent secondary contacts between four European white oak species

et al. 2017

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Historical trajectories of tree species during the late Quaternary have been well reconstructed through genetic and palaeobotanical studies. However, many congeneric tree species are interfertile, and the timing and contribution of introgression to species divergence during their evolutionary history remains largely unknown. We quantified past and current gene flow events between four morphologically divergent oak species (Quercus petraea, Q. robur, Q. pyrenaica, Q. pubescens), by two independent inference methods: diffusion approximation to the joint frequency spectrum (∂a∂i) and approximate Bayesian computation (ABC). For each pair of species, alternative scenarios of speciation allowing gene flow over different timescales were evaluated. Analyses of 3524 single nucleotide polymorphisms (SNPs) randomly distributed in the genome, showed that these species evolved in complete isolation for most of their history, but recently came into secondary contact, probably facilitated by the most recent period of postglacial warming. We demonstrated that: there was sufficient genetic differentiation before secondary contact for the accumulation of barriers to gene flow; and current European white oak genomes are a mosaic of genes that have crossed species boundaries and genes impermeable to gene flow.

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“…() as detailed in Rellstab et al . (). The nSSR data were used for species assignment (Rellstab et al .…”

Section: Methodsmentioning

confidence: 97%

“…The nSSR data were used for species assignment (Rellstab et al . ) and as population genetic basis for the EAA.…”

Section: Methodsmentioning

confidence: 99%

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Signatures of local adaptation in candidate genes of oaks (Quercus spp.) with respect to present and future climatic conditions

et al. 2016

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Testing how populations are locally adapted and predicting their response to their future environment is of key importance in view of climate change. Landscape genomics is a powerful approach to investigate genes and environmental factors involved in local adaptation. In a pooled amplicon sequencing approach of 94 genes in 71 populations, we tested whether >3500 single nucleotide polymorphisms (SNPs) in the three most common oak species in Switzerland (Quercus petraea, Q. pubescens, Q. robur) show an association with abiotic factors related to local topography, historical climate and soil characteristics. In the analysis including all species, the most frequently associated environmental factors were those best describing the habitats of the species. In the species-specific analyses, the most important environmental factors and associated SNPs greatly differed among species. However, we identified one SNP and seven genes that were associated with the same environmental factor across all species. We finally used regressions of allele frequencies of the most strongly associated SNPs along environmental gradients to predict the risk of nonadaptedness (RONA), which represents the average change in allele frequency at climate-associated loci theoretically required to match future climatic conditions. RONA is considerable for some populations and species (up to 48% in single populations) and strongly differs among species. Given the long generation time of oaks, some of the required allele frequency changes might not be realistic to achieve based on standing genetic variation. Hence, future adaptedness requires gene flow or planting of individuals carrying beneficial alleles from habitats currently matching future climatic conditions.

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Using joint multivariate analyses of leaf morphology and molecular-genetic markers for taxon identification in three hybridizing European white oak species (Quercus spp.)

Cited by 34 publications

References 41 publications

Genetic Insights into Ecological Succession from Oak- (Quercus robur L.) to Beech- (Fagus sylvatica L.) Dominated Forest Stands

Genetic Insights into Ecological Succession from Oak- (Quercus robur L.) to Beech- (Fagus sylvatica L.) Dominated Forest Stands

Extensive recent secondary contacts between four European white oak species

Signatures of local adaptation in candidate genes of oaks (Quercus spp.) with respect to present and future climatic conditions

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