1
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White LC. Shallow sequencing can mislead when evaluating hybridization capture methods. CONSERV GENET RESOUR 2023. [DOI: 10.1007/s12686-023-01298-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/05/2023]
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2
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Liu Y. Conservation prioritization based on past cascading climatic effects on genetic diversity and population size dynamics: Insights from a temperate tree species. DIVERS DISTRIB 2022. [DOI: 10.1111/ddi.13490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Affiliation(s)
- Yang Liu
- Department of Forest and Conservation Sciences University of British Columbia Vancouver British Columbia Canada
- Department of Archaeology University of Cambridge Cambridge UK
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3
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Cao Y, Zhang DY, Zeng YF, Bai WN. Recent demographic histories of temperate deciduous trees inferred from microsatellite markers. BMC Ecol Evol 2021; 21:88. [PMID: 34006219 PMCID: PMC8130339 DOI: 10.1186/s12862-021-01805-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2020] [Accepted: 04/23/2021] [Indexed: 11/17/2022] Open
Abstract
Background Accurate inference of demographic histories for temperate tree species can aid our understanding of current climate change as a driver of evolution. Microsatellites are more suitable for inferring recent historical events due to their high mutation rates. However, most programs analyzing microsatellite data assume a strict stepwise mutation model (SMM), which could cause false detection of population shrinkage when microsatellite mutation does not follow SMM. Results This study aims to reconstruct the recent demographic histories of five cool-temperate tree species in Eastern Asia, Quercus mongolica, Q. liaotungensis, Juglans cathayensis, J. mandshurica and J. ailantifolia, by using 19 microsatellite markers with two methods considering generalized stepwise mutation model (GSM) (MIGRAINE and VarEff). Both programs revealed that all the five species experienced expansions after the Last Glacial Maximum (LGM). Within butternuts, J. cathayensis experienced a more serious bottleneck than the other species, and within oaks, Q. mongolica showed a moderate increase in population size and remained stable after the expansion. In addition, the point estimates of the multistep mutation proportion in the GSM model (pGSM) for all five species were between 0.50 and 0.65, indicating that when inferring population demographic history of the cool-temperate forest species using microsatellite markers, it is better to assume a GSM rather than a SMM. Conclusions This study provides the first direct evidence that five cool-temperate tree species in East Asia have experienced expansions after the LGM with microsatellite data. Considering the mutation model of microsatellite has a vital influence on demographic inference, combining multiple programs such as MIGRAINE and VarEff can effectively reduce errors caused by inappropriate model selection and prior setting. Supplementary Information The online version contains supplementary material available at 10.1186/s12862-021-01805-w.
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Affiliation(s)
- Yu Cao
- State Key Laboratory of Earth Surface Process and Resource Ecology and Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, College of Life Sciences, Beijing Normal University, Beijing, 100875, China
| | - Da-Yong Zhang
- State Key Laboratory of Earth Surface Process and Resource Ecology and Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, College of Life Sciences, Beijing Normal University, Beijing, 100875, China
| | - Yan-Fei Zeng
- State Key Laboratory of Tree Genetics and Breeding, Chinese Academy of Forestry, Beijing, 100091, China
| | - Wei-Ning Bai
- State Key Laboratory of Earth Surface Process and Resource Ecology and Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, College of Life Sciences, Beijing Normal University, Beijing, 100875, China.
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4
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Cortés AJ, Restrepo-Montoya M, Bedoya-Canas LE. Modern Strategies to Assess and Breed Forest Tree Adaptation to Changing Climate. FRONTIERS IN PLANT SCIENCE 2020; 11:583323. [PMID: 33193532 PMCID: PMC7609427 DOI: 10.3389/fpls.2020.583323] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Accepted: 09/29/2020] [Indexed: 05/02/2023]
Abstract
Studying the genetics of adaptation to new environments in ecologically and industrially important tree species is currently a major research line in the fields of plant science and genetic improvement for tolerance to abiotic stress. Specifically, exploring the genomic basis of local adaptation is imperative for assessing the conditions under which trees will successfully adapt in situ to global climate change. However, this knowledge has scarcely been used in conservation and forest tree improvement because woody perennials face major research limitations such as their outcrossing reproductive systems, long juvenile phase, and huge genome sizes. Therefore, in this review we discuss predictive genomic approaches that promise increasing adaptive selection accuracy and shortening generation intervals. They may also assist the detection of novel allelic variants from tree germplasm, and disclose the genomic potential of adaptation to different environments. For instance, natural populations of tree species invite using tools from the population genomics field to study the signatures of local adaptation. Conventional genetic markers and whole genome sequencing both help identifying genes and markers that diverge between local populations more than expected under neutrality, and that exhibit unique signatures of diversity indicative of "selective sweeps." Ultimately, these efforts inform the conservation and breeding status capable of pivoting forest health, ecosystem services, and sustainable production. Key long-term perspectives include understanding how trees' phylogeographic history may affect the adaptive relevant genetic variation available for adaptation to environmental change. Encouraging "big data" approaches (machine learning-ML) capable of comprehensively merging heterogeneous genomic and ecological datasets is becoming imperative, too.
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Affiliation(s)
- Andrés J. Cortés
- Corporación Colombiana de Investigación Agropecuaria AGROSAVIA, Rionegro, Colombia
- Departamento de Ciencias Forestales, Facultad de Ciencias Agrarias, Universidad Nacional de Colombia – Sede Medellín, Medellín, Colombia
| | - Manuela Restrepo-Montoya
- Departamento de Ciencias Forestales, Facultad de Ciencias Agrarias, Universidad Nacional de Colombia – Sede Medellín, Medellín, Colombia
| | - Larry E. Bedoya-Canas
- Departamento de Ciencias Forestales, Facultad de Ciencias Agrarias, Universidad Nacional de Colombia – Sede Medellín, Medellín, Colombia
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5
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Zheng C, Tan L, Sang M, Ye M, Wu R. Genetic adaptation of Tibetan poplar ( Populus szechuanica var. tibetica) to high altitudes on the Qinghai-Tibetan Plateau. Ecol Evol 2020; 10:10974-10985. [PMID: 33144942 PMCID: PMC7593140 DOI: 10.1002/ece3.6508] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Revised: 05/14/2020] [Accepted: 05/28/2020] [Indexed: 12/26/2022] Open
Abstract
Plant adaptation to high altitudes has long been a substantial focus of ecological and evolutionary research. However, the genetic mechanisms underlying such adaptation remain poorly understood. Here, we address this issue by sampling, genotyping, and comparing populations of Tibetan poplar, Populus szechuanica var. tibetica, distributed from low (~2,000 m) to high altitudes (~3,000 m) of Sejila Mountain on the Qinghai-Tibet Plateau. Population structure analyses allow clear classification of two groups according to their altitudinal distributions. However, in contrast to the genetic variation within each population, differences between the two populations only explain a small portion of the total genetic variation (3.64%). We identified asymmetrical gene flow from high- to low-altitude populations. Integrating population genomic and landscape genomic analyses, we detected two hotspot regions, one containing four genes associated with altitudinal variation, and the other containing ten genes associated with response to solar radiation. These genes participate in abiotic stress resistance and regulation of reproductive processes. Our results provide insight into the genetic mechanisms underlying high-altitude adaptation in Tibetan poplar.
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Affiliation(s)
- Chenfei Zheng
- Beijing Advanced Innovation Center for Tree Breeding by Molecular DesignCenter for Computational BiologyCollege of Biological Sciences and TechnologyBeijing Forestry UniversityBeijingChina
| | - Lizhi Tan
- Beijing Advanced Innovation Center for Tree Breeding by Molecular DesignCenter for Computational BiologyCollege of Biological Sciences and TechnologyBeijing Forestry UniversityBeijingChina
| | - Mengmeng Sang
- Beijing Advanced Innovation Center for Tree Breeding by Molecular DesignCenter for Computational BiologyCollege of Biological Sciences and TechnologyBeijing Forestry UniversityBeijingChina
| | - Meixia Ye
- Beijing Advanced Innovation Center for Tree Breeding by Molecular DesignCenter for Computational BiologyCollege of Biological Sciences and TechnologyBeijing Forestry UniversityBeijingChina
| | - Rongling Wu
- Beijing Advanced Innovation Center for Tree Breeding by Molecular DesignCenter for Computational BiologyCollege of Biological Sciences and TechnologyBeijing Forestry UniversityBeijingChina
- Center for Statistical GeneticsPennsylvania State UniversityHersheyPAUSA
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6
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Cortés AJ, López-Hernández F, Osorio-Rodriguez D. Predicting Thermal Adaptation by Looking Into Populations' Genomic Past. Front Genet 2020; 11:564515. [PMID: 33101385 PMCID: PMC7545011 DOI: 10.3389/fgene.2020.564515] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Accepted: 08/24/2020] [Indexed: 12/18/2022] Open
Abstract
Molecular evolution offers an insightful theory to interpret the genomic consequences of thermal adaptation to previous events of climate change beyond range shifts. However, disentangling often mixed footprints of selective and demographic processes from those due to lineage sorting, recombination rate variation, and genomic constrains is not trivial. Therefore, here we condense current and historical population genomic tools to study thermal adaptation and outline key developments (genomic prediction, machine learning) that might assist their utilization for improving forecasts of populations' responses to thermal variation. We start by summarizing how recent thermal-driven selective and demographic responses can be inferred by coalescent methods and in turn how quantitative genetic theory offers suitable multi-trait predictions over a few generations via the breeder's equation. We later assume that enough generations have passed as to display genomic signatures of divergent selection to thermal variation and describe how these footprints can be reconstructed using genome-wide association and selection scans or, alternatively, may be used for forward prediction over multiple generations under an infinitesimal genomic prediction model. Finally, we move deeper in time to comprehend the genomic consequences of thermal shifts at an evolutionary time scale by relying on phylogeographic approaches that allow for reticulate evolution and ecological parapatric speciation, and end by envisioning the potential of modern machine learning techniques to better inform long-term predictions. We conclude that foreseeing future thermal adaptive responses requires bridging the multiple spatial scales of historical and predictive environmental change research under modern cohesive approaches such as genomic prediction and machine learning frameworks.
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Affiliation(s)
- Andrés J Cortés
- Corporación Colombiana de Investigación Agropecuaria AGROSAVIA, C.I. La Selva, Rionegro, Colombia.,Departamento de Ciencias Forestales, Facultad de Ciencias Agrarias, Universidad Nacional de Colombia - Sede Medellín, Medellín, Colombia
| | - Felipe López-Hernández
- Corporación Colombiana de Investigación Agropecuaria AGROSAVIA, C.I. La Selva, Rionegro, Colombia
| | - Daniela Osorio-Rodriguez
- Division of Geological and Planetary Sciences, California Institute of Technology (Caltech), Pasadena, CA, United States
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7
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Quantitative genetic architecture of adaptive phenology traits in the deciduous tree, Populus trichocarpa (Torr. and Gray). Heredity (Edinb) 2020; 125:449-458. [PMID: 32901141 PMCID: PMC7784687 DOI: 10.1038/s41437-020-00363-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2020] [Revised: 08/26/2020] [Accepted: 08/27/2020] [Indexed: 12/02/2022] Open
Abstract
In a warming climate, the ability to accurately predict and track shifting environmental conditions will be fundamental for plant survival. Environmental cues define the transitions between growth and dormancy as plants synchronise development with favourable environmental conditions, however these cues are predicted to change under future climate projections which may have profound impacts on tree survival and growth. Here, we use a quantitative genetic approach to estimate the genetic basis of spring and autumn phenology in Populus trichocarpa to determine this species capacity for climate adaptation. We measured bud burst, leaf coloration, and leaf senescence traits across two years (2017–2018) and combine these observations with measures of lifetime growth to determine how genetic correlations between phenology and growth may facilitate or constrain adaptation. Timing of transitions differed between years, although we found strong cross year genetic correlations in all traits, suggesting that genotypes respond in consistent ways to seasonal cues. Spring and autumn phenology were correlated with lifetime growth, where genotypes that burst leaves early and shed them late had the highest lifetime growth. We also identified substantial heritable variation in the timing of all phenological transitions (h2 = 0.5–0.8) and in lifetime growth (h2 = 0.8). The combination of additive variation and favourable genetic correlations in phenology traits suggests that populations of cultivated varieties of P. Trichocarpa may have the capability to adapt their phenology to climatic changes without negative impacts on growth.
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8
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Zhang M, Suren H, Holliday JA. Phenotypic and Genomic Local Adaptation across Latitude and Altitude in Populus trichocarpa. Genome Biol Evol 2020; 11:2256-2272. [PMID: 31298685 PMCID: PMC6735766 DOI: 10.1093/gbe/evz151] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/10/2019] [Indexed: 12/14/2022] Open
Abstract
Local adaptation to climate allows plants to cope with temporally and spatially heterogeneous environments, and parallel phenotypic clines provide a natural experiment to uncover the genomic architecture of adaptation. Though extensive effort has been made to investigate the genomic basis of local adaptation to climate across the latitudinal range of tree species, less is known for altitudinal clines. We used exome capture to genotype 451 Populus trichocarpa genotypes across altitudinal and latitudinal gradients spanning the natural species range, and phenotyped these trees for a variety of adaptive traits in two common gardens. We observed clinal variation in phenotypic traits across the two transects, which indicates climate-driven selection, and coupled gene-based genotype–phenotype and genotype–environment association scans to identify imprints of climatic adaptation on the genome. Although many of the phenotype- and climate-associated genes were unique to one transect, we found evidence of parallelism between latitude and altitude, as well as significant convergence when we compared our outlier genes with those putatively involved in climatic adaptation in two gymnosperm species. These results suggest that not only genomic constraint during adaptation to similar environmental gradients in poplar but also different environmental contexts, spatial scale, and perhaps redundant function among potentially adaptive genes and polymorphisms lead to divergent adaptive architectures.
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Affiliation(s)
- Man Zhang
- Department of Forest Resources and Environmental Conservation, Virginia Tech, Blacksburg, Virginia.,National Engineering Research Center for Floriculture, School of Landscape Architecture, Beijing Forestry University, China
| | - Haktan Suren
- Department of Forest Resources and Environmental Conservation, Virginia Tech, Blacksburg, Virginia
| | - Jason A Holliday
- Department of Forest Resources and Environmental Conservation, Virginia Tech, Blacksburg, Virginia
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9
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Pyhäjärvi T, Kujala ST, Savolainen O. 275 years of forestry meets genomics in Pinus sylvestris. Evol Appl 2020; 13:11-30. [PMID: 31988655 PMCID: PMC6966708 DOI: 10.1111/eva.12809] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Revised: 04/05/2019] [Accepted: 04/24/2019] [Indexed: 12/12/2022] Open
Abstract
Pinus sylvestris has a long history of basic and applied research that is relevant for both forestry and evolutionary studies. Its patterns of adaptive variation and role in forest economic and ecological systems have been studied extensively for nearly 275 years, detailed demography for a 100 years and mating system more than 50 years. However, its reference genome sequence is not yet available and genomic studies have been lagging compared to, for example, Pinus taeda and Picea abies, two other economically important conifers. Despite the lack of reference genome, many modern genomic methods are applicable for a more detailed look at its biological characteristics. For example, RNA-seq has revealed a complex transcriptional landscape and targeted DNA sequencing displays an excess of rare variants and geographically homogenously distributed molecular genetic diversity. Current DNA and RNA resources can be used as a reference for gene expression studies, SNP discovery, and further targeted sequencing. In the future, specific consequences of the large genome size, such as functional effects of regulatory open chromatin regions and transposable elements, should be investigated more carefully. For forest breeding and long-term management purposes, genomic data can help in assessing the genetic basis of inbreeding depression and the application of genomic tools for genomic prediction and relatedness estimates. Given the challenges of breeding (long generation time, no easy vegetative propagation) and the economic importance, application of genomic tools has a potential to have a considerable impact. Here, we explore how genomic characteristics of P. sylvestris, such as rare alleles and the low extent of linkage disequilibrium, impact the applicability and power of the tools.
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Affiliation(s)
- Tanja Pyhäjärvi
- Department of Ecology and GeneticsUniversity of OuluOuluFinland
- Biocenter OuluUniversity of OuluOuluFinland
| | | | - Outi Savolainen
- Department of Ecology and GeneticsUniversity of OuluOuluFinland
- Biocenter OuluUniversity of OuluOuluFinland
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10
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Guerra FP, Suren H, Holliday J, Richards JH, Fiehn O, Famula R, Stanton BJ, Shuren R, Sykes R, Davis MF, Neale DB. Exome resequencing and GWAS for growth, ecophysiology, and chemical and metabolomic composition of wood of Populus trichocarpa. BMC Genomics 2019; 20:875. [PMID: 31747881 PMCID: PMC6864938 DOI: 10.1186/s12864-019-6160-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Accepted: 10/09/2019] [Indexed: 12/26/2022] Open
Abstract
Background Populus trichocarpa is an important forest tree species for the generation of lignocellulosic ethanol. Understanding the genomic basis of biomass production and chemical composition of wood is fundamental in supporting genetic improvement programs. Considerable variation has been observed in this species for complex traits related to growth, phenology, ecophysiology and wood chemistry. Those traits are influenced by both polygenic control and environmental effects, and their genome architecture and regulation are only partially understood. Genome wide association studies (GWAS) represent an approach to advance that aim using thousands of single nucleotide polymorphisms (SNPs). Genotyping using exome capture methodologies represent an efficient approach to identify specific functional regions of genomes underlying phenotypic variation. Results We identified 813 K SNPs, which were utilized for genotyping 461 P. trichocarpa clones, representing 101 provenances collected from Oregon and Washington, and established in California. A GWAS performed on 20 traits, considering single SNP-marker tests identified a variable number of significant SNPs (p-value < 6.1479E-8) in association with diameter, height, leaf carbon and nitrogen contents, and δ15N. The number of significant SNPs ranged from 2 to 220 per trait. Additionally, multiple-marker analyses by sliding-windows tests detected between 6 and 192 significant windows for the analyzed traits. The significant SNPs resided within genes that encode proteins belonging to different functional classes as such protein synthesis, energy/metabolism and DNA/RNA metabolism, among others. Conclusions SNP-markers within genes associated with traits of importance for biomass production were detected. They contribute to characterize the genomic architecture of P. trichocarpa biomass required to support the development and application of marker breeding technologies.
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Affiliation(s)
- Fernando P Guerra
- Department of Plant Sciences, University of California at Davis, 262C Robbins Hall, Mail Stop 4, Davis, CA, 95616, USA.,Instituto de Ciencias Biológicas, Universidad de Talca, Talca, P.O. Box 747, 3460000, Chile
| | - Haktan Suren
- Department of Forest Resources and Environmental Conservation, Virginia Polytechnic Institute and State University, Blacksburg, VA, 24061, USA
| | - Jason Holliday
- Department of Forest Resources and Environmental Conservation, Virginia Polytechnic Institute and State University, Blacksburg, VA, 24061, USA
| | - James H Richards
- Department of Land, Air and Water Resources, University of California, Davis, CA, 95616, USA
| | - Oliver Fiehn
- Department of Molecular and Cellular Biology & Genome Center, University of California, Davis, CA, 95616, USA
| | - Randi Famula
- Department of Plant Sciences, University of California at Davis, 262C Robbins Hall, Mail Stop 4, Davis, CA, 95616, USA
| | - Brian J Stanton
- Biological Research Group, GreenWood Resources, Portland, OR, 97201, USA
| | - Richard Shuren
- Biological Research Group, GreenWood Resources, Portland, OR, 97201, USA
| | - Robert Sykes
- National Renewable Energy Laboratory, Golden, CO, 80401, USA
| | - Mark F Davis
- National Renewable Energy Laboratory, Golden, CO, 80401, USA
| | - David B Neale
- Department of Plant Sciences, University of California at Davis, 262C Robbins Hall, Mail Stop 4, Davis, CA, 95616, USA. .,Bioenergy Research Center, University of California at Davis, Davis, CA, 95616, USA.
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11
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Acosta JJ, Fahrenkrog AM, Neves LG, Resende MFR, Dervinis C, Davis JM, Holliday JA, Kirst M. Exome Resequencing Reveals Evolutionary History, Genomic Diversity, and Targets of Selection in the Conifers Pinus taeda and Pinus elliottii. Genome Biol Evol 2019; 11:508-520. [PMID: 30689841 PMCID: PMC6385631 DOI: 10.1093/gbe/evz016] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/22/2019] [Indexed: 12/22/2022] Open
Abstract
Loblolly pine (Pinus taeda) and slash pine (Pinus elliottii) are ecologically and economically important pine species that dominate many forest ecosystems in the southern United States, but like all conifers, the study of their genetic diversity and demographic history has been hampered by their large genome size. A small number of studies mainly based on candidate-gene sequencing have been reported for P. taeda to date, whereas none are available for P. elliottii. Targeted exome resequencing has recently enabled population genomics studies for conifers, approach used here to assess genomic diversity, signatures of selection, population structure, and demographic history of P. elliottii and P. taeda. Extensive similarities were revealed between these species: both species feature rapid linkage disequilibrium decay and high levels of genetic diversity. Moreover, genome-wide positive correlations for measures of genetic diversity between the species were also observed, likely due to shared structural genomic constraints. Also, positive selection appears to be targeting a common set of genes in both pines. Demographic history differs between both species, with only P. taeda being affected by a dramatic bottleneck during the last glacial period. The ability of P. taeda to recover from a dramatic reduction in population size while still retaining high levels of genetic diversity shows promise for other pines facing environmental stressors associated with climate change, indicating that these too may be able to adapt successfully to new future conditions even after a drastic population size contraction.
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Affiliation(s)
- Juan J Acosta
- School of Forest Resources and Conservation, University of Florida.,University of Florida Genetics Institute, University of Florida.,Camcore, Department of Forestry and Environmental Resources, North Carolina State University, Raleigh, NC
| | - Annette M Fahrenkrog
- School of Forest Resources and Conservation, University of Florida.,Plant Molecular and Cellular Biology Graduate Program, University of Florida
| | - Leandro G Neves
- School of Forest Resources and Conservation, University of Florida.,Plant Molecular and Cellular Biology Graduate Program, University of Florida.,RAPiD Genomics, Gainesville, FL
| | | | | | - John M Davis
- School of Forest Resources and Conservation, University of Florida
| | - Jason A Holliday
- Department of Forest Resources and Environmental Conservation, Virginia Polytechnic Institute and State University
| | - Matias Kirst
- School of Forest Resources and Conservation, University of Florida.,Plant Molecular and Cellular Biology Graduate Program, University of Florida.,University of Florida Genetics Institute, University of Florida
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12
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Cortés AJ, Skeen P, Blair MW, Chacón-Sánchez MI. Does the Genomic Landscape of Species Divergence in Phaseolus Beans Coerce Parallel Signatures of Adaptation and Domestication? FRONTIERS IN PLANT SCIENCE 2018; 9:1816. [PMID: 30619396 PMCID: PMC6306030 DOI: 10.3389/fpls.2018.01816] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2018] [Accepted: 11/22/2018] [Indexed: 05/10/2023]
Abstract
Exploring the genomic architecture of species and populations divergence aids understanding how lineages evolve and adapt, and ultimately can show the repeatability of evolutionary processes. Yet, the genomic signatures associated with divergence are still relatively unexplored, leading to a knowledge gap on whether species divergence ultimately differs in its genetic architecture from divergence at other spatial scales (i.e., populations, ecotypes). Our goal in this research was to determine whether genomic islands of speciation are more prone to harbor within-species differentiation due to genomic features, suppressed recombination, smaller effective population size or increased drift, across repeated hierarchically nested levels of divergence. We used two species of Phaseolus beans with strong genepool and population sub-structure produced by multiple independent domestications each especially in Andean and Mesoamerican / Middle American geographies. We genotyped 22,531 GBS-derived SNP markers in 209 individuals of wild and cultivated Phaseolus vulgaris and Phaseolus lunatus. We identified six regions for species-associated divergence. Out of these divergence peaks, 21% were recovered in the four within-species between-genepool comparisons and in the five within-genepool wild-cultivated comparisons (some of the latter did retrieve genuine signatures of the well described multiple domestication syndromes). However, genomic regions with overall high relative differentiation (measured by FST) coincided with regions of low SNP density and regions of elevated delta divergence between-genepools (ΔDiv), independent of the scale of divergence. The divergence in chromosome Pv10 further coincided with a between-species pericentric inversion. These convergences suggest that shared variants are being recurrently fixed at replicated regions of the genome, and in a similar manner across different hierarchically nested levels of divergence, likely as result of genomic features that make certain regions more prone to accumulate islands of speciation and within-species divergence. In summary, neighboring signatures of speciation, adaptation and domestication in Phaseolus beans are influenced by ubiquitous genomic constrains, which may continue to fortuitously shape genomic differentiation at various others scales of divergence.
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Affiliation(s)
- Andrés J. Cortés
- Corporación Colombiana de Investigación Agropecuaria (Agrosavia) – Centro de Investigación La Selva, Rionegro, Colombia
- Universidad Nacional de Colombia – Sede Medellín, Facultad de Ciencias Agrarias – Departamento de Ciencias
Forestales, Medellín, Colombia
| | - Paola Skeen
- Universidad Nacional de Colombia – Bogotá, Facultad de Ciencias Agrarias – Departamento de Agronomía, Bogotá, Colombia
- Department of Plant Sciences, University of California, Davis, Davis, CA, United States
| | - Matthew W. Blair
- Department of Agricultural and Environmental Science, Tennessee State University, Nashville, TN, United States
| | - María I. Chacón-Sánchez
- Universidad Nacional de Colombia – Bogotá, Facultad de Ciencias Agrarias – Departamento de Agronomía, Bogotá, Colombia
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13
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Functional and evolutionary genomic inferences in Populus through genome and population sequencing of American and European aspen. Proc Natl Acad Sci U S A 2018; 115:E10970-E10978. [PMID: 30373829 PMCID: PMC6243237 DOI: 10.1073/pnas.1801437115] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
We performed de novo, full-genome sequence analysis of two Populus species, North American quaking and Eurasian trembling aspen, that contain striking levels of genetic variation. Our results showed that positive and negative selection broadly affects patterns of genomic variation, but to varying degrees across coding and noncoding regions. The strength of selection and rates of sequence divergence were strongly related to differences in gene expression and coexpression network connectivity. These results highlight the importance of both positive and negative selection in shaping genome-wide levels of genetic variation in an obligately outcrossing, perennial plant. The resources we present establish aspens as a powerful study system enabling future studies for understanding the genomic determinants of adaptive evolution. The Populus genus is one of the major plant model systems, but genomic resources have thus far primarily been available for poplar species, and primarily Populus trichocarpa (Torr. & Gray), which was the first tree with a whole-genome assembly. To further advance evolutionary and functional genomic analyses in Populus, we produced genome assemblies and population genetics resources of two aspen species, Populus tremula L. and Populus tremuloides Michx. The two aspen species have distributions spanning the Northern Hemisphere, where they are keystone species supporting a wide variety of dependent communities and produce a diverse array of secondary metabolites. Our analyses show that the two aspens share a similar genome structure and a highly conserved gene content with P. trichocarpa but display substantially higher levels of heterozygosity. Based on population resequencing data, we observed widespread positive and negative selection acting on both coding and noncoding regions. Furthermore, patterns of genetic diversity and molecular evolution in aspen are influenced by a number of features, such as expression level, coexpression network connectivity, and regulatory variation. To maximize the community utility of these resources, we have integrated all presented data within the PopGenIE web resource (PopGenIE.org).
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14
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Wang Y, Jiang W, Ye W, Fu C, Gitzendanner MA, Soltis PS, Soltis DE, Qiu Y. Evolutionary insights from comparative transcriptome and transcriptome-wide coalescence analyses in Tetrastigma hemsleyanum. BMC PLANT BIOLOGY 2018; 18:208. [PMID: 30249188 PMCID: PMC6154912 DOI: 10.1186/s12870-018-1429-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Accepted: 09/17/2018] [Indexed: 05/22/2023]
Abstract
BACKGROUND Tetrastigma hemsleyanum is of great medicinal importance and used as a model system to address the evolutionary history of warm-temperate evergreen (WTE) forest biomes in East Asia over Neogene time scales. However, further studies on the neutral and adaptive divergence processes of T. hemsleyanum are currently impeded by a lack of genomic resources. In this study, we de novo assembled and annotated a reference transcriptome for two cpDNA lineages (Central-South-East vs. Southwest) of T. hemsleyanum. We further used comparative genomic and multilocus coalescent approaches to investigate the tempo and mode of lineage diversification in T. hemsleyanum. RESULTS A total of 52,838 and 65,197 unigenes with an N50 of 1,667 and 1,841 bp for Central-South-East (CSE) and Southwest (SW) lineages, respectively, were recovered, and 6,692 putative orthologs were identified between the two lineages. Estimation of Ka/Ks ratios for these orthologs revealed that ten genes had Ka/Ks values significantly greater than 0.5 (P < 0.05), whereas 2,099 (Ka/Ks < 0.5, P < 0.05) were inferred to be under purifying selection. Based on three bioinformatic strategies, we identified a total of 1,018 single-copy nuclear genes (SCNGs) from the orthologs. We successfully designed eight nuclear gene primer pairs with high intraspecific variation (e.g. hT = 0.923, πT = 1.68×10-3), when surveyed across a subset of T. hemsleyanum individuals. Concordant with the previous cpDNA data, the haplotype networks constructed for most nuclear gene loci clearly identified the two lineages. A multilocus coalescence analysis suggested that the separation between the two lineages appears to have occurred during the mid-Pliocene. Despite their ancient divergence, both lineages experienced expansion at rather localized scales and have continued to exchange genes at a low rate. CONCLUSIONS This study demonstrated the utility of transcriptome sequencing as a basis for SCNG development in non-model species and the advantages of integrating multiple nuclear loci for phylogeographic and phylogenetic studies.
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Affiliation(s)
- Yihan Wang
- Key Laboratory of Conservation Biology for Endangered Wildlife of the Ministry of Education, and College of Life Sciences, Zhejiang University, Hangzhou, 310058 China
- College of Life Sciences, Henan Agricultural University, Zhengzhou, 450002 China
| | - Weimei Jiang
- Key Laboratory of Conservation Biology for Endangered Wildlife of the Ministry of Education, and College of Life Sciences, Zhejiang University, Hangzhou, 310058 China
| | - Wenqing Ye
- Key Laboratory of Conservation Biology for Endangered Wildlife of the Ministry of Education, and College of Life Sciences, Zhejiang University, Hangzhou, 310058 China
| | - Chengxin Fu
- Key Laboratory of Conservation Biology for Endangered Wildlife of the Ministry of Education, and College of Life Sciences, Zhejiang University, Hangzhou, 310058 China
| | | | - Pamela S Soltis
- Florida Museum of Natural History, University of Florida, Gainesville, FL 32611 USA
| | - Douglas E Soltis
- Department of Biology, University of Florida, Gainesville, FL 32611 USA
- Florida Museum of Natural History, University of Florida, Gainesville, FL 32611 USA
| | - Yingxiong Qiu
- Key Laboratory of Conservation Biology for Endangered Wildlife of the Ministry of Education, and College of Life Sciences, Zhejiang University, Hangzhou, 310058 China
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15
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Chhatre VE, Evans LM, DiFazio SP, Keller SR. Adaptive introgression and maintenance of a trispecies hybrid complex in range‐edge populations of
Populus. Mol Ecol 2018; 27:4820-4838. [DOI: 10.1111/mec.14820] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2017] [Revised: 07/19/2018] [Accepted: 07/20/2018] [Indexed: 12/16/2022]
Affiliation(s)
- Vikram E. Chhatre
- Department of Plant Biology University of Vermont Burlington Vermont
| | - Luke M. Evans
- Department of Ecology and Evolutionary Biology Institute of Behavioral Genetics University of Colorado Boulder Colorado
| | | | - Stephen R. Keller
- Department of Plant Biology University of Vermont Burlington Vermont
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16
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Genotyping and Sequencing Technologies in Population Genetics and Genomics. POPULATION GENOMICS 2018. [DOI: 10.1007/13836_2017_5] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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17
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Wei M, Xu X, Li C. Identification and expression of CAMTA genes in Populus trichocarpa under biotic and abiotic stress. Sci Rep 2017; 7:17910. [PMID: 29263356 PMCID: PMC5738416 DOI: 10.1038/s41598-017-18219-8] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2017] [Accepted: 12/07/2017] [Indexed: 12/16/2022] Open
Abstract
The calmodulin-binding transcription activators (CAMTAs) transcription factor family plays an important role in normal plant growth and development, as well as in biotic and abiotic stress resistance. In this study, we identified seven CAMTA genes across the whole genome of Populus trichocarpa and analyzed the expression patterns of PtCAMTAs in the root and leaf tissues. Promoter cis-element analysis indicated that most CAMTA genes contained stress- or phytohormone-related cis-elements. Quantitative real-time reverse transcription-PCR (qRT-PCR) indicated indicated that PtCAMTAs were induced by mannitol, NaCl, cold stress, pathogenic infection with A. alternata, and phytohormone treatments with abscisic acid, salicylic acid, and methyl jasmonate. We analyzed the expression of homologous genes between P. trichocarpa and P. ussuriensis and alternative splicing forms of PtCAMTA genes under cold stress. We also performed a network interaction analysis for PtCAMTA proteins to predict their interactions and associations. The results of the present study serve as a basis for future functional studies on the Populus CAMTA family.
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Affiliation(s)
- Ming Wei
- State Key Laboratory of Tree Genetics and Breeding, Northeast Forestry University, 26 Hexing Road, Harbin, 150040, China
| | - Xuemei Xu
- Library of Northeast Forestry University, 26 Hexing Road, Harbin, 150040, China
| | - Chenghao Li
- State Key Laboratory of Tree Genetics and Breeding, Northeast Forestry University, 26 Hexing Road, Harbin, 150040, China.
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18
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Abstract
Phylogeography, and its extensions into comparative phylogeography, have their roots in the layering of gene trees across geography, a paradigm that was greatly facilitated by the nonrecombining, fast evolution provided by animal mtDNA. As phylogeography moves into the era of next-generation sequencing, the specter of reticulation at several levels-within loci and genomes in the form of recombination and across populations and species in the form of introgression-has raised its head with a prominence even greater than glimpsed during the nuclear gene PCR era. Here we explore the theme of reticulation in comparative phylogeography, speciation analysis, and phylogenomics, and ask how the centrality of gene trees has fared in the next-generation era. To frame these issues, we first provide a snapshot of multilocus phylogeographic studies across the Carpentarian Barrier, a prominent biogeographic barrier dividing faunas spanning the monsoon tropics in northern Australia. We find that divergence across this barrier is evident in most species, but is heterogeneous in time and demographic history, often reflecting the taxonomic distinctness of lineages spanning it. We then discuss a variety of forces generating reticulate patterns in phylogeography, including introgression, contact zones, and the potential selection-driven outliers on next-generation molecular markers. We emphasize the continued need for demographic models incorporating reticulation at the level of genomes and populations, and conclude that gene trees, whether explicit or implicit, should continue to play a role in the future of phylogeography.
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19
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Harris SE, Munshi-South J. Signatures of positive selection and local adaptation to urbanization in white-footed mice (Peromyscus leucopus). Mol Ecol 2017; 26:6336-6350. [PMID: 28980357 DOI: 10.1111/mec.14369] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2016] [Accepted: 09/25/2017] [Indexed: 02/06/2023]
Abstract
Urbanization significantly alters natural ecosystems and has accelerated globally. Urban wildlife populations are often highly fragmented by human infrastructure, and isolated populations may adapt in response to local urban pressures. However, relatively few studies have identified genomic signatures of adaptation in urban animals. We used a landscape genomic approach to examine signatures of selection in urban populations of white-footed mice (Peromyscus leucopus) in New York City. We analysed 154,770 SNPs identified from transcriptome data from 48 P. leucopus individuals from three urban and three rural populations and used outlier tests to identify evidence of urban adaptation. We accounted for demography by simulating a neutral SNP data set under an inferred demographic history as a null model for outlier analysis. We also tested whether candidate genes were associated with environmental variables related to urbanization. In total, we detected 381 outlier loci and after stringent filtering, identified and annotated 19 candidate loci. Many of the candidate genes were involved in metabolic processes and have well-established roles in metabolizing lipids and carbohydrates. Our results indicate that white-footed mice in New York City are adapting at the biomolecular level to local selective pressures in urban habitats. Annotation of outlier loci suggests selection is acting on metabolic pathways in urban populations, likely related to novel diets in cities that differ from diets in less disturbed areas.
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Affiliation(s)
- Stephen E Harris
- The Graduate Center, City University of New York (CUNY), New York, NY, USA
| | - Jason Munshi-South
- Louis Calder Center-Biological Field Station, Fordham University, Armonk, NY, USA
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20
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Fahrenkrog AM, Neves LG, Resende MFR, Dervinis C, Davenport R, Barbazuk WB, Kirst M. Population genomics of the eastern cottonwood ( Populus deltoides). Ecol Evol 2017; 7:9426-9440. [PMID: 29187979 PMCID: PMC5696417 DOI: 10.1002/ece3.3466] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2017] [Revised: 08/14/2017] [Accepted: 08/16/2017] [Indexed: 12/30/2022] Open
Abstract
Despite its economic importance as a bioenergy crop and key role in riparian ecosystems, little is known about genetic diversity and adaptation of the eastern cottonwood (Populus deltoides). Here, we report the first population genomics study for this species, conducted on a sample of 425 unrelated individuals collected in 13 states of the southeastern United States. The trees were genotyped by targeted resequencing of 18,153 genes and 23,835 intergenic regions, followed by the identification of single nucleotide polymorphisms (SNPs). This natural P. deltoides population showed low levels of subpopulation differentiation (FST = 0.022–0.106), high genetic diversity (θW = 0.00100, π = 0.00170), a large effective population size (Ne ≈ 32,900), and low to moderate levels of linkage disequilibrium. Additionally, genomewide scans for selection (Tajima's D), subpopulation differentiation (XTX), and environmental association analyses with eleven climate variables carried out with two different methods (LFMM and BAYENV2) identified genes putatively involved in local adaptation. Interestingly, many of these genes were also identified as adaptation candidates in another poplar species, Populus trichocarpa, indicating possible convergent evolution. This study constitutes the first assessment of genetic diversity and local adaptation in P. deltoides throughout the southern part of its range, information we expect to be of use to guide management and breeding strategies for this species in future, especially in the face of climate change.
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Affiliation(s)
- Annette M Fahrenkrog
- School of Forest Resources and Conservation University of Florida Gainesville FL USA.,Plant Molecular and Cellular Biology Graduate Program University of Florida Gainesville FL USA
| | - Leandro G Neves
- School of Forest Resources and Conservation University of Florida Gainesville FL USA.,Plant Molecular and Cellular Biology Graduate Program University of Florida Gainesville FL USA.,Present address: RAPiD Genomics LLC756 2nd Avenue Gainesville FL 32601 USA
| | - Márcio F R Resende
- Horticultural Sciences Department University of Florida Gainesville FL USA
| | - Christopher Dervinis
- School of Forest Resources and Conservation University of Florida Gainesville FL USA
| | - Ruth Davenport
- Biology Department University of Florida Gainesville FL USA
| | - W Brad Barbazuk
- Biology Department University of Florida Gainesville FL USA.,University of Florida Genetics Institute University of Florida Gainesville FL USA
| | - Matias Kirst
- School of Forest Resources and Conservation University of Florida Gainesville FL USA.,University of Florida Genetics Institute University of Florida Gainesville FL USA
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21
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McKown AD, Klápště J, Guy RD, Soolanayakanahally RY, La Mantia J, Porth I, Skyba O, Unda F, Douglas CJ, El-Kassaby YA, Hamelin RC, Mansfield SD, Cronk QCB. Sexual homomorphism in dioecious trees: extensive tests fail to detect sexual dimorphism in Populus †. Sci Rep 2017; 7:1831. [PMID: 28500332 PMCID: PMC5431824 DOI: 10.1038/s41598-017-01893-z] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2016] [Accepted: 04/05/2017] [Indexed: 11/09/2022] Open
Abstract
The evolution of sexual dimorphism and expansion of sex chromosomes are both driven through sexual conflict, arising from differing fitness optima between males and females. Here, we pair work in poplar (Populus) describing one of the smallest sex-determining regions known thus far in complex eukaryotes (~100 kbp) with comprehensive tests for sexual dimorphism using >1300 individuals from two Populus species and assessing 96 non-reproductive functional traits. Against expectation, we found sexual homomorphism (no non-reproductive trait differences between the sexes), suggesting that gender is functionally neutral with respect to non-reproductive features that affect plant survival and fitness. Combined with a small sex-determining region, we infer that sexual conflict may be effectively stymied or non-existent within these taxa. Both sexual homomorphism and the small sex-determining region occur against a background of strong environmental selection and local adaptation in Populus. This presents a powerful hypothesis for the evolution of dioecious species. Here, we suggest that environmental selection may be sufficient to suppress and stymy sexual conflict if it acts orthogonal to sexual selection, thereby placing limitations on the evolution of sexual dimorphism and genomic expansion of sex chromosomes.
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Affiliation(s)
- Athena D McKown
- Department of Forest and Conservation Sciences, Faculty of Forestry, University of British Columbia, Forest Sciences Centre, Vancouver, BC V6T 1Z4, Canada.
| | - Jaroslav Klápště
- Department of Dendrology and Forest Tree Breeding, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences, Prague, 165 21, Czech Republic.,Scion (New Zealand Forest Research Institute Ltd.), Whakarewarewa, Rotorua, 3046, New Zealand
| | - Robert D Guy
- Department of Forest and Conservation Sciences, Faculty of Forestry, University of British Columbia, Forest Sciences Centre, Vancouver, BC V6T 1Z4, Canada
| | - Raju Y Soolanayakanahally
- Saskatoon Research and Development Centre, Agriculture and Agri-Food Canada, Saskatoon, SK, S7N 0X2, Canada
| | - Jonathan La Mantia
- United States Department of Agriculture-Agricultural Research Service (USDA-ARS), Corn and Soybean Research, Wooster, OH, 44691, USA
| | - Ilga Porth
- Department of Wood Science, Faculty of Forestry, University of British Columbia, Forest Sciences Centre, Vancouver, BC V6T 1Z4, Canada.,Département des sciences du bois et de la forêt, Faculté de foresterie, de géographie et de géomatique, Université Laval, Québec, QC G1V 0A6, Canada
| | - Oleksandr Skyba
- Department of Wood Science, Faculty of Forestry, University of British Columbia, Forest Sciences Centre, Vancouver, BC V6T 1Z4, Canada
| | - Faride Unda
- Department of Wood Science, Faculty of Forestry, University of British Columbia, Forest Sciences Centre, Vancouver, BC V6T 1Z4, Canada
| | - Carl J Douglas
- Department of Botany, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
| | - Yousry A El-Kassaby
- Department of Forest and Conservation Sciences, Faculty of Forestry, University of British Columbia, Forest Sciences Centre, Vancouver, BC V6T 1Z4, Canada
| | - Richard C Hamelin
- Department of Forest and Conservation Sciences, Faculty of Forestry, University of British Columbia, Forest Sciences Centre, Vancouver, BC V6T 1Z4, Canada
| | - Shawn D Mansfield
- Department of Wood Science, Faculty of Forestry, University of British Columbia, Forest Sciences Centre, Vancouver, BC V6T 1Z4, Canada
| | - Quentin C B Cronk
- Department of Botany, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
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22
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Landscape Genomics of Angiosperm Trees: From Historic Roots to Discovering New Branches of Adaptive Evolution. COMPARATIVE AND EVOLUTIONARY GENOMICS OF ANGIOSPERM TREES 2017. [DOI: 10.1007/7397_2016_19] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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23
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Fahrenkrog AM, Neves LG, Resende MFR, Vazquez AI, de Los Campos G, Dervinis C, Sykes R, Davis M, Davenport R, Barbazuk WB, Kirst M. Genome-wide association study reveals putative regulators of bioenergy traits in Populus deltoides. THE NEW PHYTOLOGIST 2017; 213:799-811. [PMID: 27596807 DOI: 10.1111/nph.14154] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2016] [Accepted: 07/13/2016] [Indexed: 05/18/2023]
Abstract
Genome-wide association studies (GWAS) have been used extensively to dissect the genetic regulation of complex traits in plants. These studies have focused largely on the analysis of common genetic variants despite the abundance of rare polymorphisms in several species, and their potential role in trait variation. Here, we conducted the first GWAS in Populus deltoides, a genetically diverse keystone forest species in North America and an important short rotation woody crop for the bioenergy industry. We searched for associations between eight growth and wood composition traits, and common and low-frequency single-nucleotide polymorphisms detected by targeted resequencing of 18 153 genes in a population of 391 unrelated individuals. To increase power to detect associations with low-frequency variants, multiple-marker association tests were used in combination with single-marker association tests. Significant associations were discovered for all phenotypes and are indicative that low-frequency polymorphisms contribute to phenotypic variance of several bioenergy traits. Our results suggest that both common and low-frequency variants need to be considered for a comprehensive understanding of the genetic regulation of complex traits, particularly in species that carry large numbers of rare polymorphisms. These polymorphisms may be critical for the development of specialized plant feedstocks for bioenergy.
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Affiliation(s)
- Annette M Fahrenkrog
- School of Forest Resources and Conservation, University of Florida, PO Box 110410, Gainesville, FL, 32611, USA
- Plant Molecular and Cellular Biology Graduate Program, University of Florida, PO Box 110690, Gainesville, FL, 32610, USA
| | - Leandro G Neves
- School of Forest Resources and Conservation, University of Florida, PO Box 110410, Gainesville, FL, 32611, USA
- Plant Molecular and Cellular Biology Graduate Program, University of Florida, PO Box 110690, Gainesville, FL, 32610, USA
| | - Márcio F R Resende
- School of Forest Resources and Conservation, University of Florida, PO Box 110410, Gainesville, FL, 32611, USA
- Genetics and Genomics Graduate Program, University of Florida, PO Box 103610, Gainesville, FL, 32610, USA
| | - Ana I Vazquez
- Department of Epidemiology and Biostatistics, Michigan State University, 909 Fee Road, East Lansing, MI, 48824, USA
| | - Gustavo de Los Campos
- Department of Epidemiology and Biostatistics, Michigan State University, 909 Fee Road, East Lansing, MI, 48824, USA
- Statistics Department, Michigan State University, 619 Red Cedar Road, MI, 48824, USA
| | - Christopher Dervinis
- School of Forest Resources and Conservation, University of Florida, PO Box 110410, Gainesville, FL, 32611, USA
| | - Robert Sykes
- National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, CO, 80401, USA
| | - Mark Davis
- National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, CO, 80401, USA
| | - Ruth Davenport
- Biology Department, University of Florida, PO Box 118525, Gainesville, FL, 32611, USA
| | - William B Barbazuk
- Plant Molecular and Cellular Biology Graduate Program, University of Florida, PO Box 110690, Gainesville, FL, 32610, USA
- Biology Department, University of Florida, PO Box 118525, Gainesville, FL, 32611, USA
- University of Florida Genetics Institute, University of Florida, PO Box 103610, Gainesville, FL, 32611, USA
| | - Matias Kirst
- School of Forest Resources and Conservation, University of Florida, PO Box 110410, Gainesville, FL, 32611, USA
- Plant Molecular and Cellular Biology Graduate Program, University of Florida, PO Box 110690, Gainesville, FL, 32610, USA
- University of Florida Genetics Institute, University of Florida, PO Box 103610, Gainesville, FL, 32611, USA
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24
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Jordan R, Dillon SK, Prober SM, Hoffmann AA. Landscape genomics reveals altered genome wide diversity within revegetated stands of Eucalyptus microcarpa (Grey Box). THE NEW PHYTOLOGIST 2016; 212:992-1006. [PMID: 27440730 DOI: 10.1111/nph.14084] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2016] [Accepted: 05/31/2016] [Indexed: 05/22/2023]
Abstract
In order to contribute to evolutionary resilience and adaptive potential in highly modified landscapes, revegetated areas should ideally reflect levels of genetic diversity within and across natural stands. Landscape genomic analyses enable such diversity patterns to be characterized at genome and chromosomal levels. Landscape-wide patterns of genomic diversity were assessed in Eucalyptus microcarpa, a dominant tree species widely used in revegetation in Southeastern Australia. Trees from small and large patches within large remnants, small isolated remnants and revegetation sites were assessed across the now highly fragmented distribution of this species using the DArTseq genomic approach. Genomic diversity was similar within all three types of remnant patches analysed, although often significantly but only slightly lower in revegetation sites compared with natural remnants. Differences in diversity between stand types varied across chromosomes. Genomic differentiation was higher between small, isolated remnants, and among revegetated sites compared with natural stands. We conclude that small remnants and revegetated sites of our E. microcarpa samples largely but not completely capture patterns in genomic diversity across the landscape. Genomic approaches provide a powerful tool for assessing restoration efforts across the landscape.
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Affiliation(s)
- Rebecca Jordan
- Bio21 Institute, School of BioSciences, University of Melbourne, 30 Flemington Rd, Parkville, Vic, 3010, Australia
- CSIRO Land and Water, 147 Underwood Ave, Floreat, WA, 6014, Australia
| | - Shannon K Dillon
- CSIRO Agriculture, Clunies Ross Street, Black Mountain, ACT, 2601, Australia
| | - Suzanne M Prober
- CSIRO Land and Water, 147 Underwood Ave, Floreat, WA, 6014, Australia
| | - Ary A Hoffmann
- Bio21 Institute, School of BioSciences, University of Melbourne, 30 Flemington Rd, Parkville, Vic, 3010, Australia
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25
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Zhang M, Zhou L, Bawa R, Suren H, Holliday J. Recombination Rate Variation, Hitchhiking, and Demographic History Shape Deleterious Load in Poplar. Mol Biol Evol 2016; 33:2899-2910. [DOI: 10.1093/molbev/msw169] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
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26
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Suren H, Hodgins KA, Yeaman S, Nurkowski KA, Smets P, Rieseberg LH, Aitken SN, Holliday JA. Exome capture from the spruce and pine giga‐genomes. Mol Ecol Resour 2016; 16:1136-46. [DOI: 10.1111/1755-0998.12570] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Revised: 07/06/2016] [Accepted: 07/11/2016] [Indexed: 12/12/2022]
Affiliation(s)
- H. Suren
- Department of Forest Resources and Environmental Conservation Virginia Tech 304 Cheatham Hall Blacksburg VA 24061 USA
- Genetics Bioinformatics and Computational Biology Program Virginia Tech Blacksburg VA 24061 USA
| | - K. A. Hodgins
- School of Biological Sciences Monash University Bld 18 Clayton VIC 3800 Australia
| | - S. Yeaman
- Department of Biological Sciences University of Calgary Calgary Alberta Canada
| | - K. A. Nurkowski
- School of Biological Sciences Monash University Bld 18 Clayton VIC 3800 Australia
| | - P. Smets
- Department of Forest and Conservation Sciences University of British Columbia 3041‐2424 Main Mall Vancouver BC V6T 1Z4 Canada
| | - L. H. Rieseberg
- Department of Botany University of British Columbia 3529 ‐ 6270 University Boulevard Vancouver British Columbia V6T 1Z4 Canada
| | - S. N. Aitken
- Department of Forest and Conservation Sciences University of British Columbia 3041‐2424 Main Mall Vancouver BC V6T 1Z4 Canada
| | - J. A. Holliday
- Department of Forest Resources and Environmental Conservation Virginia Tech 304 Cheatham Hall Blacksburg VA 24061 USA
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27
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Holliday JA, Zhou L, Bawa R, Zhang M, Oubida RW. Evidence for extensive parallelism but divergent genomic architecture of adaptation along altitudinal and latitudinal gradients in Populus trichocarpa. THE NEW PHYTOLOGIST 2016; 209:1240-51. [PMID: 26372471 DOI: 10.1111/nph.13643] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2015] [Accepted: 08/13/2015] [Indexed: 05/10/2023]
Abstract
Adaptation to climate across latitude and altitude reflects shared climatic constraints, which may lead to parallel adaptation. However, theory predicts that higher gene flow should favor more concentrated genomic architectures, which would lead to fewer locally maladapted recombinants. We used exome capture to resequence the gene space along a latitudinal and two altitudinal transects in the model tree Populus trichocapra. Adaptive trait phenotyping was coupled with FST outlier tests and sliding window analysis to assess the degree of parallel adaptation as well as the genomic distribution of outlier loci. Up to 51% of outlier loci overlapped between transect pairs and up to 15% of these loci overlapped among all three transects. Genomic clustering of adaptive loci was more pronounced for altitudinal than latitudinal transects. In both altitudinal transects, there was a larger number of these 'islands of divergence', which were on average longer and included several of exceptional physical length. Our results suggest that recapitulation of genetic clines over latitude and altitude involves extensive parallelism, but that steep altitudinal clines generate islands of divergence. This suggests that physical proximity of genes in coadapted complexes may buffer against the movement of maladapted alleles from geographically proximal but climatically distinct populations.
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Affiliation(s)
- Jason A Holliday
- Department of Forest Resources and Environmental Conservation, Virginia Polytechnic Institute and State University, 304 Cheatham Hall, Blacksburg, VA, 24061, USA
| | - Lecong Zhou
- Department of Forest Resources and Environmental Conservation, Virginia Polytechnic Institute and State University, 304 Cheatham Hall, Blacksburg, VA, 24061, USA
| | - Rajesh Bawa
- Department of Forest Resources and Environmental Conservation, Virginia Polytechnic Institute and State University, 304 Cheatham Hall, Blacksburg, VA, 24061, USA
| | - Man Zhang
- Department of Forest Resources and Environmental Conservation, Virginia Polytechnic Institute and State University, 304 Cheatham Hall, Blacksburg, VA, 24061, USA
| | - Regis W Oubida
- Department of Forest Resources and Environmental Conservation, Virginia Polytechnic Institute and State University, 304 Cheatham Hall, Blacksburg, VA, 24061, USA
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28
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Natural Selection and Recombination Rate Variation Shape Nucleotide Polymorphism Across the Genomes of Three Related Populus Species. Genetics 2015; 202:1185-200. [PMID: 26721855 PMCID: PMC4788117 DOI: 10.1534/genetics.115.183152] [Citation(s) in RCA: 65] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2015] [Accepted: 12/24/2015] [Indexed: 12/30/2022] Open
Abstract
A central aim of evolutionary genomics is to identify the relative roles that various evolutionary forces have played in generating and shaping genetic variation within and among species. Here we use whole-genome resequencing data to characterize and compare genome-wide patterns of nucleotide polymorphism, site frequency spectrum, and population-scaled recombination rates in three species of Populus: Populus tremula, P. tremuloides, and P. trichocarpa. We find that P. tremuloides has the highest level of genome-wide variation, skewed allele frequencies, and population-scaled recombination rates, whereas P. trichocarpa harbors the lowest. Our findings highlight multiple lines of evidence suggesting that natural selection, due to both purifying and positive selection, has widely shaped patterns of nucleotide polymorphism at linked neutral sites in all three species. Differences in effective population sizes and rates of recombination largely explain the disparate magnitudes and signatures of linked selection that we observe among species. The present work provides the first phylogenetic comparative study on a genome-wide scale in forest trees. This information will also improve our ability to understand how various evolutionary forces have interacted to influence genome evolution among related species.
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Mathew LA, Jensen JD. Evaluating the ability of the pairwise joint site frequency spectrum to co-estimate selection and demography. Front Genet 2015; 6:268. [PMID: 26347771 PMCID: PMC4538300 DOI: 10.3389/fgene.2015.00268] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2015] [Accepted: 08/03/2015] [Indexed: 12/23/2022] Open
Abstract
The ability to infer the parameters of positive selection from genomic data has many important implications, from identifying drug-resistance mutations in viruses to increasing crop yield by genetically integrating favorable alleles. Although it has been well-described that selection and demography may result in similar patterns of diversity, the ability to jointly estimate these two processes has remained elusive. Here, we use simulation to explore the utility of the joint site frequency spectrum to estimate selection and demography simultaneously, including developing an extension of the previously proposed Jaatha program (Mathew et al., 2013). We evaluate both complete and incomplete selective sweeps under an isolation-with-migration model with and without population size change (both population growth and bottlenecks). Results suggest that while it may not be possible to precisely estimate the strength of selection, it is possible to infer the presence of selection while estimating accurate demographic parameters. We further demonstrate that the common assumption of selective neutrality when estimating demographic models may lead to severe biases. Finally, we apply the approach we have developed to better characterize the within-host demographic and selective history of human cytomegalovirus (HCMV) infection using published next generation sequencing data.
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Affiliation(s)
- Lisha A Mathew
- School of Life Sciences, École Polytechnique Fédérale de Lausanne Lausanne, Switzerland
| | - Jeffrey D Jensen
- School of Life Sciences, École Polytechnique Fédérale de Lausanne Lausanne, Switzerland
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Menon M, Barnes WJ, Olson MS. Population genetics of freeze tolerance among natural populations of Populus balsamifera across the growing season. THE NEW PHYTOLOGIST 2015; 207:710-22. [PMID: 25809016 DOI: 10.1111/nph.13381] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2014] [Accepted: 02/16/2015] [Indexed: 05/07/2023]
Abstract
Protection against freeze damage during the growing season influences the northern range limits of plants. Freeze tolerance and freeze avoidance are the two major freeze resistance strategies. Winter survival strategies have been extensively studied in perennials, but few have addressed them and their genetic basis during the growing season. We examined intraspecific phenotypic variation in freeze resistance of Populus balsamifera across latitude and the growing season. To investigate the molecular basis of this variation, we surveyed nucleotide diversity and examined patterns of gene expression in the poplar C-repeat binding factor (CBF) gene family. Foliar freeze tolerance exhibited latitudinal and seasonal variation indicative of natural genotypic variation. CBF6 showed signatures of recent selective sweep. Of the 46 SNPs surveyed across the six CBF homologs, only CBF2_619 exhibited latitudinal differences consistent with increased freeze tolerance in the north. All six CBF genes were cold inducible, but showed varying patterns of expression across the growing season. Some Poplar CBF homologs exhibited patterns consistent with historical selection and clinal variation in freeze tolerance documented here. However, the CBF genes accounted for only a small amount of the variation, indicating that other genes in this and other molecular pathways likely play significant roles in nature.
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Affiliation(s)
- Mitra Menon
- Department of Biological Sciences, Texas Tech University, Lubbock, TX, 79409, USA
| | - William J Barnes
- Department of Biological Sciences, Texas Tech University, Lubbock, TX, 79409, USA
| | - Matthew S Olson
- Department of Biological Sciences, Texas Tech University, Lubbock, TX, 79409, USA
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Stölting KN, Paris M, Meier C, Heinze B, Castiglione S, Bartha D, Lexer C. Genome-wide patterns of differentiation and spatially varying selection between postglacial recolonization lineages of Populus alba (Salicaceae), a widespread forest tree. THE NEW PHYTOLOGIST 2015; 207:723-34. [PMID: 25817433 DOI: 10.1111/nph.13392] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2014] [Accepted: 02/25/2015] [Indexed: 05/10/2023]
Abstract
Studying the divergence continuum in plants is relevant to fundamental and applied biology because of the potential to reveal functionally important genetic variation. In this context, whole-genome sequencing (WGS) provides the necessary rigour for uncovering footprints of selection. We resequenced populations of two divergent phylogeographic lineages of Populus alba (n = 48), thoroughly characterized by microsatellites (n = 317), and scanned their genomes for regions of unusually high allelic differentiation and reduced diversity using > 1.7 million single nucleotide polymorphisms (SNPs) from WGS. Results were confirmed by Sanger sequencing. On average, 9134 high-differentiation (≥ 4 standard deviations) outlier SNPs were uncovered between populations, 848 of which were shared by ≥ three replicate comparisons. Annotation revealed that 545 of these were located in 437 predicted genes. Twelve percent of differentiation outlier genome regions exhibited significantly reduced genetic diversity. Gene ontology (GO) searches were successful for 327 high-differentiation genes, and these were enriched for 63 GO terms. Our results provide a snapshot of the roles of 'hard selective sweeps' vs divergent selection of standing genetic variation in distinct postglacial recolonization lineages of P. alba. Thus, this study adds to our understanding of the mechanisms responsible for the origin of functionally relevant variation in temperate trees.
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Affiliation(s)
- Kai N Stölting
- Unit of Ecology and Evolution, Department of Biology, University of Fribourg, Chemin du Musee 10, 1700, Fribourg, Switzerland
| | - Margot Paris
- Unit of Ecology and Evolution, Department of Biology, University of Fribourg, Chemin du Musee 10, 1700, Fribourg, Switzerland
| | - Cécile Meier
- Unit of Ecology and Evolution, Department of Biology, University of Fribourg, Chemin du Musee 10, 1700, Fribourg, Switzerland
| | - Berthold Heinze
- Department of Forest Genetics, Austrian Research Centre for Forests (BFW), Seckendorff-Gudent Weg 8, 1130, Vienna, Austria
| | | | - Denes Bartha
- Department of Botany, West-Hungarian University, 9400, Sopron, Hungary
| | - Christian Lexer
- Unit of Ecology and Evolution, Department of Biology, University of Fribourg, Chemin du Musee 10, 1700, Fribourg, Switzerland
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Yang X, Du Q, Chen J, Wang B, Zhang D. Association mapping in Populus reveals the interaction between Pto-miR530a and its target Pto-KNAT1. PLANTA 2015; 242:77-95. [PMID: 25833262 DOI: 10.1007/s00425-015-2287-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2014] [Accepted: 03/20/2015] [Indexed: 05/26/2023]
Abstract
We used transcript profiling and multi-SNP association to investigate the genetic regulatory relationship between miRNA Pto-miR530a and its target Pto-KNAT1, identifying additive, dominant, and epistatic effects. MicroRNAs (miRNAs) play crucial roles in the post-transcriptional regulation of plant growth and development; indeed, many studies have described the importance of miRNA-target interactions in herbaceous species. However, elucidation of the miRNA-target interactions in trees may require novel strategies. In the present study, we describe a strategy combining expression profiling by reverse transcription quantitative PCR (RT-qPCR) and association mapping with multiple single nucleotide polymorphisms (SNPs) to evaluate the interaction between Pto-miR530a and its target Pto-KNAT1 in Populus tomentosa. RT-qPCR analysis showed a negative correlation (r = -0.62, P < 0.05) between expression levels of Pto-miR530a and Pto-KNAT1 in eight tissues. We used a Bayesian hierarchical model to identify allelic variants of Pto-miR530a and Pto-KNAT1 that associated with eight traits related to growth and wood properties, in a population of 460 unrelated individuals of P. tomentosa. This analysis identified 27 associations, with the proportions of phenotypic variance (R (2)) contributed by each SNP ranging of 0.82-15.81 %, the additive effects of each SNP ranging of 0.16-18.09, and the dominant effects ranging from -14.09 to 19.00. Epistatic interaction models showed a strong interaction among SNPs in the miRNA target with R (2) of 0.1-3.56 %, and information gain of significant SNP pairs of -3.09 to 0.93 %, representing the regulatory interactions between the miRNA and the mRNA. Thus, we used a new strategy that combines association genetics and expression profiling based on SNPs to study the regulatory relationship between this miRNA and its target mRNA, thereby providing novel advances in our understanding of the genetic architecture of important traits.
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Affiliation(s)
- Xiaohui Yang
- National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Technology, Beijing Forestry University, No. 35, Qinghua East Road, Beijing, 100083, People's Republic of China,
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Szövényi P, Frangedakis E, Ricca M, Quandt D, Wicke S, Langdale JA. Establishment of Anthoceros agrestis as a model species for studying the biology of hornworts. BMC PLANT BIOLOGY 2015; 15:98. [PMID: 25886741 PMCID: PMC4393856 DOI: 10.1186/s12870-015-0481-x] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2015] [Accepted: 03/24/2015] [Indexed: 05/18/2023]
Abstract
BACKGROUND Plants colonized terrestrial environments approximately 480 million years ago and have contributed significantly to the diversification of life on Earth. Phylogenetic analyses position a subset of charophyte algae as the sister group to land plants, and distinguish two land plant groups that diverged around 450 million years ago - the bryophytes and the vascular plants. Relationships between liverworts, mosses hornworts and vascular plants have proven difficult to resolve, and as such it is not clear which bryophyte lineage is the sister group to all other land plants and which is the sister to vascular plants. The lack of comparative molecular studies in representatives of all three lineages exacerbates this uncertainty. Such comparisons can be made between mosses and liverworts because representative model organisms are well established in these two bryophyte lineages. To date, however, a model hornwort species has not been available. RESULTS Here we report the establishment of Anthoceros agrestis as a model hornwort species for laboratory experiments. Axenic culture conditions for maintenance and vegetative propagation have been determined, and treatments for the induction of sexual reproduction and sporophyte development have been established. In addition, protocols have been developed for the extraction of DNA and RNA that is of a quality suitable for molecular analyses. Analysis of haploid-derived genome sequence data of two A. agrestis isolates revealed single nucleotide polymorphisms at multiple loci, and thus these two strains are suitable starting material for classical genetic and mapping experiments. CONCLUSIONS Methods and resources have been developed to enable A. agrestis to be used as a model species for developmental, molecular, genomic, and genetic studies. This advance provides an unprecedented opportunity to investigate the biology of hornworts.
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Affiliation(s)
- Péter Szövényi
- Institute of Evolutionary Biology and Environmental Studies, University of Zurich, Zurich, Switzerland.
- Institute of Systematic Botany, University of Zurich, Zurich, Switzerland.
- Swiss Institute of Bioinformatics, Quartier Sorge-Batiment Genopode, Lausanne, Switzerland.
- MTA-ELTE-MTM Ecology Research Group, ELTE, Biological Institute, Budapest, Hungary.
| | - Eftychios Frangedakis
- Department of Plant Sciences, University of Oxford, South Parks Rd, Oxford, UK.
- Current Address: Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113 0033, Japan.
| | - Mariana Ricca
- Institute of Evolutionary Biology and Environmental Studies, University of Zurich, Zurich, Switzerland.
- Swiss Institute of Bioinformatics, Quartier Sorge-Batiment Genopode, Lausanne, Switzerland.
| | - Dietmar Quandt
- Nees-Institut für Biodiversität der Pflanzen, University of Bonn, Meckenheimer Allee 170, D - 53115, Bonn, Germany.
| | - Susann Wicke
- Nees-Institut für Biodiversität der Pflanzen, University of Bonn, Meckenheimer Allee 170, D - 53115, Bonn, Germany.
- Institute for Evolution and Biodiversity, University of Muenster, Huefferstr. 1, 48149, Muenster, Germany.
| | - Jane A Langdale
- Department of Plant Sciences, University of Oxford, South Parks Rd, Oxford, UK.
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Oubida RW, Gantulga D, Zhang M, Zhou L, Bawa R, Holliday JA. Partitioning of multivariate phenotypes using regression trees reveals complex patterns of adaptation to climate across the range of black cottonwood (Populus trichocarpa). FRONTIERS IN PLANT SCIENCE 2015; 6:181. [PMID: 25870603 PMCID: PMC4375981 DOI: 10.3389/fpls.2015.00181] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2014] [Accepted: 03/06/2015] [Indexed: 05/25/2023]
Abstract
Local adaptation to climate in temperate forest trees involves the integration of multiple physiological, morphological, and phenological traits. Latitudinal clines are frequently observed for these traits, but environmental constraints also track longitude and altitude. We combined extensive phenotyping of 12 candidate adaptive traits, multivariate regression trees, quantitative genetics, and a genome-wide panel of SNP markers to better understand the interplay among geography, climate, and adaptation to abiotic factors in Populus trichocarpa. Heritabilities were low to moderate (0.13-0.32) and population differentiation for many traits exceeded the 99th percentile of the genome-wide distribution of FST, suggesting local adaptation. When climate variables were taken as predictors and the 12 traits as response variables in a multivariate regression tree analysis, evapotranspiration (Eref) explained the most variation, with subsequent splits related to mean temperature of the warmest month, frost-free period (FFP), and mean annual precipitation (MAP). These grouping matched relatively well the splits using geographic variables as predictors: the northernmost groups (short FFP and low Eref) had the lowest growth, and lowest cold injury index; the southern British Columbia group (low Eref and intermediate temperatures) had average growth and cold injury index; the group from the coast of California and Oregon (high Eref and FFP) had the highest growth performance and the highest cold injury index; and the southernmost, high-altitude group (with high Eref and low FFP) performed poorly, had high cold injury index, and lower water use efficiency. Taken together, these results suggest variation in both temperature and water availability across the range shape multivariate adaptive traits in poplar.
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Affiliation(s)
| | | | | | | | | | - Jason A. Holliday
- *Correspondence: Jason A. Holliday, Department of Forest Resources and Environmental Conservation, Virginia Polytechnic Institute and State University, 304 Cheatham Hall, Blacksburg, VA 24061, USA
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Geographical barriers and climate influence demographic history in narrowleaf cottonwoods. Heredity (Edinb) 2015; 114:387-96. [PMID: 25585921 DOI: 10.1038/hdy.2014.115] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2014] [Revised: 10/30/2014] [Accepted: 11/04/2014] [Indexed: 12/29/2022] Open
Abstract
Studies of genetic variation can clarify the role of geography and spatio-temporal variation of climate in shaping demography, particularly in temperate zone tree species with large latitudinal ranges. Here, we examined genetic variation in narrowleaf cottonwood, Populus angustifolia, a dominant riparian tree. Using multi-locus surveys of polymorphism in 363 individuals across the species' 1800 km latitudinal range, we found that, first, P. angustifolia has stronger neutral genetic structure than many forest trees (simple sequence repeat (SSR) FST=0.21), with major genetic groups corresponding to large apparent geographical barriers to gene flow. Second, using SSRs and putatively neutral sequenced loci, coalescent simulations indicated that populations diverged before the last glacial maximum (LGM), suggesting the presence of population structure before the LGM. Third, the LGM and subsequent warming appear to have had different influences on each of these distinct populations, with effective population size reduction in the southern extent of the range but major expansion in the north. These results are consistent with the hypothesis that climate and geographic barriers have jointly affected the demographic history of P. angustifolia, and point the importance of both factors as being instrumental in shaping genetic variation and structure in widespread forest trees.
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McKown AD, Guy RD, Quamme L, Klápště J, La Mantia J, Constabel CP, El-Kassaby YA, Hamelin RC, Zifkin M, Azam MS. Association genetics, geography and ecophysiology link stomatal patterning in Populus trichocarpa with carbon gain and disease resistance trade-offs. Mol Ecol 2014; 23:5771-90. [PMID: 25319679 DOI: 10.1111/mec.12969] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2014] [Revised: 09/29/2014] [Accepted: 10/12/2014] [Indexed: 01/18/2023]
Abstract
Stomata are essential for diffusive entry of gases to support photosynthesis, but may also expose internal leaf tissues to pathogens. To uncover trade-offs in range-wide adaptation relating to stomata, we investigated the underlying genetics of stomatal traits and linked variability in these traits with geoclimate, ecophysiology, condensed foliar tannins and pathogen susceptibility in black cottonwood (Populus trichocarpa). Upper (adaxial) and lower (abaxial) leaf stomatal traits were measured from 454 accessions collected throughout much of the species range. We calculated broad-sense heritability (H(2) ) of stomatal traits and, using SNP data from a 34K Populus SNP array, performed a genome-wide association studies (GWAS) to uncover genes underlying stomatal trait variation. H(2) values for stomatal traits were moderate (average H(2) = 0.33). GWAS identified genes associated primarily with adaxial stomata, including polarity genes (PHABULOSA), stomatal development genes (BRASSINOSTEROID-INSENSITIVE 2) and disease/wound-response genes (GLUTAMATE-CYSTEINE LIGASE). Stomatal traits correlated with latitude, gas exchange, condensed tannins and leaf rust (Melampsora) infection. Latitudinal trends of greater adaxial stomata numbers and guard cell pore size corresponded with higher stomatal conductance (gs ) and photosynthesis (Amax ), faster shoot elongation, lower foliar tannins and greater Melampsora susceptibility. This suggests an evolutionary trade-off related to differing selection pressures across the species range. In northern environments, more adaxial stomata and larger pore sizes reflect selection for rapid carbon gain and growth. By contrast, southern genotypes have fewer adaxial stomata, smaller pore sizes and higher levels of condensed tannins, possibly linked to greater pressure from natural leaf pathogens, which are less significant in northern ecosystems.
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Affiliation(s)
- Athena D McKown
- Department of Forest and Conservation Sciences, Faculty of Forestry, Forest Sciences Centre, University of British Columbia, 2424 Main Mall, Vancouver, BC, V6T 1Z4, Canada
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