Signatures of diversifying selection at <scp>EST</scp>‐<scp>SSR</scp> loci and association with climate in natural <i><scp>E</scp>ucalyptus</i> populations

Bradbury, Donna; Smithson, Ann; Krauss, Siegfried L.

doi:10.1111/mec.12463

Cited by 44 publications

(45 citation statements)

References 85 publications

(154 reference statements)

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“…Indeed, the genetic differentiation we observed falls within the range of values reported for geographically isolated populations, or across species' ranges, in the southwest region and that are attributed to isolation by distance effects (Bradbury et al, 2013b;Nistelberger et al, 2015). Alternatively, high population genetic differentiation may reflect colonisation or recruitment history (Jones et al, 2006;Pardini and Hamrick, 2008).…”

Section: Discussionmentioning

confidence: 64%

Paternity analysis reveals wide pollen dispersal and high multiple paternity in a small isolated population of the bird-pollinated Eucalyptus caesia (Myrtaceae)

et al. 2016

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Optimal foraging behaviour by nectavores is expected to result in a leptokurtic pollen dispersal distribution and predominantly near-neighbour mating. However, complex social interactions among nectarivorous birds may result in different mating patterns to those typically observed in insect-pollinated plants. Mating system, realised pollen dispersal and spatial genetic structure were examined in the bird-pollinated Eucalyptus caesia, a species characterised by small, geographically disjunct populations. Nine microsatellite markers were used to genotype an entire adult stand and 181 seeds from 28 capsules collected from 6 trees. Mating system analysis using MLTR revealed moderate to high outcrossing (t m = 0.479-0.806) and low estimates of correlated paternity (r p = 0.136 ± s.e. 0.048). Paternity analysis revealed high outcrossing rates (mean = 0.72) and high multiple paternity, with 64 different sires identified for 181 seeds. There was a significant negative relationship between the frequency of outcross mating and distance between mating pairs. Realised mating events were more frequent than expected with random mating for plants o40 m apart. The overall distribution of pollen dispersal distances was platykurtic. Despite extensive pollen dispersal within the stand, three genetic clusters were detected by STRUCTURE analysis. These genetic clusters were strongly differentiated yet geographically interspersed, hypothesised to be a consequence of rare recruitment events coupled with extreme longevity. We suggest that extensive polyandry and pollen dispersal is a consequence of pollination by highly mobile honeyeaters and may buffer E. caesia against the loss of genetic diversity predicted for small and genetically isolated populations.

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Section: Discussionmentioning

confidence: 64%

Paternity analysis reveals wide pollen dispersal and high multiple paternity in a small isolated population of the bird-pollinated Eucalyptus caesia (Myrtaceae)

et al. 2016

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“…Relationships between putatively adaptive genomic markers and climate are emerging for a range of eucalypt species, including E. tricarpa (Bradbury et al 2013). Importantly, the genomic data also reveal that many (although not all) putatively adaptive alleles remain present across the sampled range of a species ( Figure 5).…”

Section: Climate-related Genetic Variation In Putatively Adaptive Allmentioning

confidence: 91%

Climate adaptation and ecological restoration in eucalypts

Prober¹,

Potts²,

Bailey³

et al. 2016

Proc. R. Soc. Vic.

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Eucalypts are the cornerstone of ecological restoration efforts across the highly modified agricultural landscapes of southern Australia. \u27Local provenancing\u27 is the established strategy for sourcing germplasm for ecological restoration plantings, yet this approach gives little consideration to the persistence of these plantings under future climates. This paper provides a synopsis of recent and ongoing research that the authors are undertaking on climate adaptation in eucalypts, combining new genomic approaches with ecophysiological evidence from provenance trials. These studies explore how adaptive diversity is distributed within and among populations, whether populations are buffered against change through capacity for phenotypic plasticity, and how this informs provenancing strategies. Results to date suggest that eucalypts have some capacity to respond to future environmental instability through adaptive phenotypic plasticity or selection of putatively adaptive alleles. Despite this, growing evidence suggests that eucalypts will still be vulnerable to change. Provenancing strategies that exploit adaptations found in non-local provenances could thus confer greater climate-resilience in ecological restoration plantings, although they will also need to account for potential interactions between climate adaptations and other factors (e.g. cryptic evolutionary variation, non-climate-related adaptations, herbivory and elevated CO2)

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“…Identifying genes that are under selection in natural populations of tree species will facilitate our understanding of how these populations are adapted to their environment and responded to future climatic changes (Bradbury et al, 2013). Evidence for selection at the molecular genetic level has been demonstrated in some important tree species such as spruce (Namroud et al, 2008), pine (Eveno et al, 2008), oak (Alberto et al, 2013) and Eucalyptus (Bradbury et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Footprints of divergent selection in natural populations of Castanopsis fargesii (Fagaceae)

Sun

Huang

et al. 2014

Heredity

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Given predicted rapid climate change, an understanding of how environmental factors affect genetic diversity in natural populations is important. Future selection pressures are inherently unpredictable, so forest management policies should maintain both overall diversity and identify genetic markers associated with the environmental factors expected to change most rapidly, like temperature and rainfall. In this study, we genotyped 648 individuals in 28 populations of Castanopsis fargesii (Fagaceae) using 32 expressed sequence tag (EST)-derived microsatellite markers. After removing six loci that departed from Hardy-Weinberg equilibrium, we measured genetic variation, population structure and identified candidate loci putatively under selection by temperature and precipitation. We found that C. fargesii populations possessed high genetic diversity and moderate differentiation among them, indicating predominant outcrossing and few restrictions to gene flow. These patterns reduce the possible impact of stochastic effects or the influence of genetic isolation. Clear footprints of divergent selection at four loci were discovered. Frequencies of five alleles at these loci were strongly correlated with environmental factors, particularly extremes in precipitation. These alleles varied from being near fixation at one end of the gradient to being completely absent at the other. Our study species is an important forest tree in the subtropical regions of China and could have a major role in future management and reforestation plans. Our results demonstrate that the gene flow is widespread and abundant in natural populations, maintaining high diversity, while diversifying selection is acting on specific genomic regions.

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Signatures of diversifying selection at EST‐SSR loci and association with climate in natural Eucalyptus populations

Cited by 44 publications

References 85 publications

Paternity analysis reveals wide pollen dispersal and high multiple paternity in a small isolated population of the bird-pollinated Eucalyptus caesia (Myrtaceae)

Paternity analysis reveals wide pollen dispersal and high multiple paternity in a small isolated population of the bird-pollinated Eucalyptus caesia (Myrtaceae)

Climate adaptation and ecological restoration in eucalypts

Footprints of divergent selection in natural populations of Castanopsis fargesii (Fagaceae)

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