Contrasted patterns of local adaptation to climate change across the range of an evergreen oak, <i>Quercus aquifolioides</i>

Du, Fang; Wang, Tianrui; Wang, Yuyao; Ueno, S.; Lafontaine, Guillaume de

doi:10.1111/eva.13030

Cited by 34 publications

(23 citation statements)

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“…This interpretation is consistent with the significant proportion of variation explained by the genotypic factor for both the symmetric components of leaf shape and leaf size traits (~ 20% in Table 3, using a more complete set of nSSRs), when using dbRDA to jointly test geographic, genetic, and climatic factors on morphological variation. Besides, Du et al (2020) also showed strong patterns of isolation by distance overall and within lineages, using a few hundred SNP markers, consistently with genetic drift and limited gene flow between distant populations.…”

Section: Possible Impact Of Lineages Geographical Isolation On Leaf Size and Shape Variationmentioning

confidence: 65%

“…In the WSP-HDM group of populations, divergent selection pressures were also recently suggested to interpret molecular signals of differentiation at particular drought-stress related candidate genes (Du et al 2020). This could be linked to the observation that climatic variables explained a significant part, although relatively low, of the symmetric components of leaf shape variation across the species range (Table 3, 7.1% and 3.5% of total variance for marginal and conditional dbRDA tests respectively).…”

Section: Impact Of Environmental Pressures On Leaf Shape and Size Traitsmentioning

confidence: 99%

“…Phylogeography study based on nuclear microsatellite (nSSRs) suggested relatively high genetic differentiation (F ST ~ 7%) between two regions across the Q. aquifolioides geographic range, which we referred to as the Western Sichuan Plateau-Hengduan Mountains (WSP-HDM) lineage and the Tibet lineage (Du et al 2017). Furthermore, landscape genomics analysis based on 65 drought-stress related candidate genes revealed contrasting patterns of genetic differentiation among populations within both lineages, with stronger evidence for local adaptation to changing environments in the WSP-HDM, while both Tibet and WSP-HDM lineages showed significant patterns of isolation by distance (Du et al 2020). The purpose of this study is first to examine whether morphological variation observed within Q. aquifolioides can be significantly partitioned among the WSP-HDM and Tibet lineages, and if so, to assess the relative importance of geographic distribution, neutral genetic processes, and local climatic factors in shaping leaf morphological variation or explaining various components of leaf morphological variation.…”

Section: Introductionmentioning

confidence: 98%

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Genetic, geographic, and climatic factors jointly shape leaf morphology of an alpine oak, Quercus aquifolioides Rehder & E.H. Wilson

Zhang

Liao

et al. 2021

Annals of Forest Science

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Key message Leaf symmetry and leaf size are explained by genetic variation between and within lineages and to a lesser extent by climatic factors, while leaf asymmetry can only be partly explained by geographic factors in Quercus aquifolioides Rehder & E.H. Wilson.Context Leaves are the primary photosynthetic organs of plants, and their morphology affects various crucial physiological processes potentially linked to fitness. Aims We explored the variation in leaf morphology of an alpine oak, Quercus aquifolioides, in order to examine its relationship to genetic, geographic, and climatic factors. Methods We conducted a genetic survey using 25 nuclear microsatellites. Based on Bayesian clustering analysis, 273 sampled trees from 29 populations of Q. aquifolioides were assigned to two lineages that correspond to the Western Sichuan Plateau-Hengduan Mountains (WSP-HDM) and Tibet geographic areas, with some individuals showing mixed ancestry. To undertake morphological analyses, we collected 1435 leaves from these trees and characterized them in terms of 13 landmarks. The metric dimensions of these leaves were digitally captured in the two-dimensional coordinates of these landmarks, then divided into leaf size and symmetric and asymmetric components of leaf shape. To analyze how different components of leaf morphology vary across lineages, we employed Procrustes Analysis of Variance (ANOVA), two-block partial least-square analysis (2B-PLS), and several other multivariate analysis approaches. We also applied distance-based redundancy analysis (dbRDAs) to explore relations between leaf morphology and genetic, geographic, and climatic factors. Results Multivariate analysis indicated significant differentiation in leaf symmetric shape components and leaf size between the WSP-HDM and Tibet lineages, while the mixed individuals were morphologically intermediate. The dbRDA analysis showed that most of the variation in symmetric components and leaf size was explained by genotypic effects, with the symmetric components of leaf shape being also significantly explained by geography and climate; however, variation in asymmetric components is only very weakly explained by geography. Conclusion Our results demonstrated that leaf morphological variation in shape and size across Q. aquifolioides geographic range is related to both its genetic differentiation and to a lesser extent to climatic factors. We discuss how these patterns could be interpreted in terms of both geographical isolations among and within lineages, and possible adaptive responses for particular traits, in contrast to asymmetric variation.

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Section: Possible Impact Of Lineages Geographical Isolation On Leaf Size and Shape Variationmentioning

confidence: 65%

Section: Impact Of Environmental Pressures On Leaf Shape and Size Traitsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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Genetic, geographic, and climatic factors jointly shape leaf morphology of an alpine oak, Quercus aquifolioides Rehder & E.H. Wilson

Zhang

Liao

et al. 2021

Annals of Forest Science

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“…Landscape genomics provides unprecedented insights into understanding the mechanism of adaptive variation of tree species by dissecting the impacts of environmental variables and landscape characteristics on their adaptive evolution ( Browne et al, 2019 ; Pina-Martins et al, 2019 ; Borrell et al, 2020 ; Du et al, 2020 ; Zhao et al, 2020 ). Common challenges, such as the sampling strategies and using only a single analysis for detecting adaptive signatures, still exist in landscape genomic studies although many reviews discuss the abovementioned topics ( Balkenhol et al, 2019 ).…”

Section: Challenges and Future Directionsmentioning

confidence: 99%

Landscape Genomics in Tree Conservation Under a Changing Environment

Feng

2022

Front. Plant Sci.

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Understanding the genetic basis of how species respond to changing environments is essential to the conservation of species. However, the molecular mechanisms of adaptation remain largely unknown for long-lived tree species which always have large population sizes, long generation time, and extensive gene flow. Recent advances in landscape genomics can reveal the signals of adaptive selection linking genetic variations and landscape characteristics and therefore have created novel insights into tree conservation strategies. In this review article, we first summarized the methods of landscape genomics used in tree conservation and elucidated the advantages and disadvantages of these methods. We then highlighted the newly developed method “Risk of Non-adaptedness,” which can predict the genetic offset or genomic vulnerability of species via allele frequency change under multiple scenarios of climate change. Finally, we provided prospects concerning how our introduced approaches of landscape genomics can assist policymaking and improve the existing conservation strategies for tree species under the ongoing global changes.

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“…Adaptive responses from standing genetic variation in response to rapidly changing environments is a much faster process than mutations (Barrett & Schluter, 2008; de Lafontaine et al., 2018). Thus, local populations of widespread tree taxa that experience relatively warm and dry summer conditions in some portions of the species range may already contain in situ genotypes that are better adapted to drought stress relative to variants present in other regions (Du, Wang, Wang, Ueno, & de Lafontaine, 2020). Such molecular variants represent useful sources of genetic variation for managing populations to enhance resiliency to future climate shifts (Christmas et al., 2016) and could be potential targets for assisted gene flow to mitigate maladapted populations (Aitken & Whitlock, 2013).…”

Section: Introductionmentioning

confidence: 99%

Exploring genomic variation associated with drought stress in Picea mariana populations

Napier

Lafontaine

2020

Ecology and Evolution

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Predicted increases in drought and heat stress will likely induce shifts in species bioclimatic envelopes. Genetic variants adapted to water limitation may prove pivotal for species response under scenarios of increasing drought. In this study, we aimed to explore this hypothesis by investigating genetic variation in 16 populations of black spruce (Picea mariana) in relation to climate variables in Alaska. A total of 520 single nucleotide polymorphisms (SNPs) were genotyped for 158 trees sampled from areas of contrasting climate regimes. We used multivariate and univariate genotype‐by‐environment approaches along with available gene annotations to investigate the relationship between climate and genetic variation among sampled populations. Nine SNPs were identified as having a significant association with climate, of which five were related to drought stress response. Outlier SNPs with respect to the overall environment were significantly overrepresented for several biological functions relevant for coping with variable hydric regimes, including osmotic stress response. This genomic imprint is consistent with local adaptation of black spruce to drought stress. These results suggest that natural selection acting on standing variation prompts local adaptation in forest stands facing water limitation. Improved understanding of possible adaptive responses could inform our projections about future forest dynamics and help prioritize populations that harbor valuable genetic diversity for conservation.

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Contrasted patterns of local adaptation to climate change across the range of an evergreen oak, Quercus aquifolioides

Abstract: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Cited by 34 publications

References 100 publications

Genetic, geographic, and climatic factors jointly shape leaf morphology of an alpine oak, Quercus aquifolioides Rehder & E.H. Wilson

Genetic, geographic, and climatic factors jointly shape leaf morphology of an alpine oak, Quercus aquifolioides Rehder & E.H. Wilson

Landscape Genomics in Tree Conservation Under a Changing Environment

Exploring genomic variation associated with drought stress in Picea mariana populations

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