Climate-Related Adaptive Genetic Variation and Population Structure in Forests

A special issue of Forests (ISSN 1999-4907). This special issue belongs to the section "Forest Ecophysiology and Biology".

Deadline for manuscript submissions: closed (25 September 2020) | Viewed by 6868

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Dipartimento di Biotecnologie e Scienze della Vita, Università degli Studi dell'Insubria via J.H. Dunant 3, 21100 Varese, Italy
Interests: population genetics; conservation genetics; quantitative genetics; evolutionary biology
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Special Issue Information

Dear Colleagues,

Adaptation to local environments will be a challenging issue for forests in the face of global climate changes. While other organisms have the choice of migrating to a better suited habitat, the current rate of climate change can be too fast for forest trees, which will have the only choice of locally adapting. Therefore, the knowledge of genetic adaptive traits is an essential support to actions in forest management and conservation.

Many approaches are now available to do this, from “classical” studies of association between some loci and environmental variables, carried also to a genomic scale by the use of SNPs arrays, to more sophisticated modeling, such as those used in landscape genetics/genomics, to Bayesian analyses aimed at unravelling the confounding effect of demography and population genetic structure, so as not to impact on the assessment of adaptive variation.

Further, information on the relationship between genetic variation and environmental variation is necessary to implement bioclimatic models to simulate how the present genetic variation will be shaped by a changing environment and to identify current and projected distribution of forest species. This aspect will also benefit from the validation of genetic and phenotypic associations under controlled environments.

The information obtained from different approaches can lead to the identification of genotypes adapted to future climatic conditions, to select seed sources and populations for planning sound conservation strategies like assisted migration or assisted range expansion, to help forest tree species to cope with fast-changing climatic conditions and prevent localized declines.

The threat to forests represented by imminent climate changes requires immediate countermeasures; because of this, we deem that a journal issue devoted to “Climate-Related Adaptive Genetic Variation and Population Structure in Forests” will be of general interest to many colleagues.

Prof. Giorgio Binelli
Guest Editor

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Keywords

  • Forest genetics
  • Genetic structure
  • Climate change
  • Adaptive variation
  • Local adaptation
  • Landscape genetics
  • Candidate genes
  • Genome–environment association
  • Coalescent modelling
  • Approximate Bayesian computation
  • Population genomics
  • Landscape genomics
  • Forest ecology
  • Biogeography

Published Papers (2 papers)

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Research

23 pages, 1719 KiB  
Article
Combined Analyses of Phenotype, Genotype and Climate Implicate Local Adaptation as a Driver of Diversity in Eucalyptus microcarpa (Grey Box)
by Rebecca Jordan, Suzanne M. Prober, Ary A. Hoffmann and Shannon K. Dillon
Forests 2020, 11(5), 495; https://doi.org/10.3390/f11050495 - 28 Apr 2020
Cited by 6 | Viewed by 3199
Abstract
Trees are a keystone species in many ecosystems and a critical component of ecological restoration. Understanding their capacity to respond to climate change is essential for conserving biodiversity and determining appropriate restoration seed sources. Patterns of local adaptation to climate between populations within [...] Read more.
Trees are a keystone species in many ecosystems and a critical component of ecological restoration. Understanding their capacity to respond to climate change is essential for conserving biodiversity and determining appropriate restoration seed sources. Patterns of local adaptation to climate between populations within a species can inform such conservation decisions and are often investigated from either a quantitative trait or molecular genetic basis. Here, we present findings from a combined analysis of phenotype (quantitative genetic analysis), genotype (single nucleotide polymorphism (SNP) trait associations), and climate associations. We draw on the strength of this combined approach to investigate pre-existing climate adaptation and its genetic basis in Eucalyptus microcarpa (Grey box), an important tree for ecological restoration in south-eastern Australia. Phenotypic data from a 26-year-old provenance trial demonstrated significant genetic variation in growth and leaf traits at both the family and provenance levels. Growth traits were only associated with temperature, whilst leaf traits were associated with temperature, precipitation and aridity. Genotyping of 40 putatively adaptive SNPs from previous genome-wide analyses identified 9 SNPs associated with these traits. Drawing on previous SNP–climate association results, several associations were identified between all three comparisons of phenotype, genotype and climate. By combining phenotypic with genomic analyses, these results corroborate genomic findings and enhance understanding of climate adaptation in E. microcarpa. We discuss the implication of these results for conservation management and restoration under climate change. Full article
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19 pages, 5948 KiB  
Article
Expression Analysis of the NAC Transcription Factor Family of Populus in Response to Salt Stress
by Shengji Wang, Juanjuan Huang, Xingdou Wang, Hui Dang, Tingbo Jiang and Youzhi Han
Forests 2019, 10(8), 688; https://doi.org/10.3390/f10080688 - 14 Aug 2019
Cited by 12 | Viewed by 3360
Abstract
Research Highlights: Sequence phylogeny, genome organisation, gene structure, conserved motifs, promoter cis-element and expression profiling of poplar NACs related to salt stress were detected. In addition, expression of two salt-induced NACs was analysed. Background and Objectives: NAC transcription factor (TF) proteins are involved [...] Read more.
Research Highlights: Sequence phylogeny, genome organisation, gene structure, conserved motifs, promoter cis-element and expression profiling of poplar NACs related to salt stress were detected. In addition, expression of two salt-induced NACs was analysed. Background and Objectives: NAC transcription factor (TF) proteins are involved in a wide range of functions during plant development and stress-related endurance processes. To understand the function of Populus NAC TFs in salt stress tolerance, we characterised the structure and expression profile of a total of 289 NAC members. Materials and Methods: Sequence phylogeny, genome organisation, gene structure, motif composition and promoter cis-element were detected using bioinformatics. The expression pattern of Populus NAC TFs under salt stress was also detected using RNA-Seq and RT-qPCR. Results: Synteny analysis showed that 46 and 37 Populus NAC genes were involved in whole-genome duplication and tandem duplication events, respectively. The expression pattern of Populus NAC TFs under salt stress showed the expression of the 289 PtNACs of 84K poplar was induced. Similar expression trends of NACs were found in Populus simonii × P. nigra T. S. Hwang et Liang and Arabidopsis thaliana (L.) Heynh. Conclusions: The correlation analysis showed that the expression of two differentially expressed NAC genes PtNAC024 and PtNAC182 was significantly associated with most of the 63 differentially expressed genes tested. The expression of PtNAC024 and PtNAC182 in different tissues was also analysed in silico and different expression patterns were found. Together, this study provides a solid basis to explore stress-related NAC TF functions in Populus salt tolerance and development. Full article
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