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Tonin R, Wilhelmi S, Gültas M, Gerdol R, Paun O, Trucchi E, Schmitt AO, Wellstein C. Ice holes microrefugia harbor genetically and functionally distinct populations of Vaccinium vitis-idaea (Ericaceae). Sci Rep 2023; 13:13055. [PMID: 37567871 PMCID: PMC10421893 DOI: 10.1038/s41598-023-39772-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2023] [Accepted: 07/31/2023] [Indexed: 08/13/2023] Open
Abstract
In the mountain terrain, ice holes are little depressions between rock boulders that are characterized by the exit of cold air able to cool down the rock surface even in summer. This cold air creates cold microrefugia in warmer surroundings that preserve plant species probably over thousands of years under extra-zonal climatic conditions. We hypothesized that ice hole populations of the model species Vaccinium vitis-idaea (Ericaceae) show genetic differentiation from nearby zonal subalpine populations, and high functional trait distinctiveness, in agreement with genetic patterns. We genotyped almost 30,000 single nucleotide polymorphisms using restriction site-associated DNA sequencing and measured eight functional traits indicative of individual performance and ecological strategies. Genetic results showed high differentiation among the six populations suggesting isolation. On siliceous bedrock, ice hole individuals exhibited higher levels of admixture than those from subalpine populations which could have experienced more bottlenecks during demographic fluctuations related to glacial cycles. Ice hole and subalpine calcareous populations clearly separated from siliceous populations, indicating a possible effect of bedrock in shaping genetic patterns. Trait analysis reflected the bedrock effect on populations' differentiation. The significant correlation between trait and genetic distances suggests the genetic contribution in shaping intraspecific functional differentiation. In conclusion, extra-zonal populations reveal a prominent genetic and phenotypic differentiation determined by history and ecological contingency. Therefore, microrefugia populations can contribute to the overall variability of the species and lead to intraspecific-driven responses to upcoming environmental changes.
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Affiliation(s)
- Rita Tonin
- Faculty of Agricultural, Environmental and Food Sciences, Free University of Bozen-Bolzano, 39100, Bozen, Italy
| | - Selina Wilhelmi
- Breeding Informatics Group, Department of Animal Sciences, University of Göttingen, 37075, Göttingen, Germany
- Center for Integrated Breeding Research (CiBreed), 37075, Göttingen, Germany
- Department of Forest Genetics and Forest Tree Breeding, University of Göttingen, 37077, Göttingen, Germany
| | - Mehmet Gültas
- Center for Integrated Breeding Research (CiBreed), 37075, Göttingen, Germany
- Faculty of Agriculture, South Westphalia University of Applied Sciences, 59494, Soest, Germany
| | - Renato Gerdol
- Department of Environmental and Prevention Sciences, University of Ferrara, 44121, Ferrara, Italy
| | - Ovidiu Paun
- Department for Botany and Biodiversity Research, University of Vienna, 1030, Vienna, Austria
| | - Emiliano Trucchi
- Department of Life and Environmental Science, Università Politecnica delle Marche, 60131, Ancona, Italy
| | - Armin Otto Schmitt
- Breeding Informatics Group, Department of Animal Sciences, University of Göttingen, 37075, Göttingen, Germany
- Center for Integrated Breeding Research (CiBreed), 37075, Göttingen, Germany
| | - Camilla Wellstein
- Faculty of Agricultural, Environmental and Food Sciences, Free University of Bozen-Bolzano, 39100, Bozen, Italy.
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Šrut M, Sabolić I, Erdelez A, Grbin D, Furdek Turk M, Bakarić R, Peharda M, Štambuk A. Marine Pollutant Tributyltin Affects DNA Methylation and Fitness of Banded Murex ( Hexaplex trunculus) Populations. TOXICS 2023; 11:276. [PMID: 36977041 PMCID: PMC10051066 DOI: 10.3390/toxics11030276] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 03/07/2023] [Accepted: 03/13/2023] [Indexed: 06/18/2023]
Abstract
Banded murex, Hexaplex trunculus, is a marine gastropod whose reproductive fitness can be severely affected by very low concentrations of antifouling compound tributyltin (TBT). TBT has strong xenoandrogen impacts on snails, causing the development of imposex (e.g., the superimposition of male sexual characteristic in females), thereby affecting the fitness of entire populations. TBT is also known as a DNA-demethylating agent and an obesogenic factor. The aim of this study was to unravel the interactions between TBT bioaccumulation, phenotypic responses, and epigenetic and genetic endpoints in native populations of H. trunculus. Seven populations inhabiting environments along the pollution gradient were sampled in the coastal eastern Adriatic. These included sites of intense marine traffic and boat maintenance activity and sites with low anthropogenic impact. Populations inhabiting intermediately and highly polluted sites exhibited higher TBT burdens, higher incidences of imposex, and higher wet masses of snails than populations in lowly polluted sites. Other morphometric traits and cellular biomarker responses did not show clear differentiation among populations in relation to marine traffic/pollution intensity. An analysis of methylation sensitive amplification polymorphism (MSAP) revealed environmentally driven population differentiation and higher epigenetics than genetic within-population diversity. Moreover, decreases in genome-wide DNA methylation coincided with the imposex level and snail mass, suggesting an epigenetic background of the animal phenotypic response.
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Affiliation(s)
- Maja Šrut
- Institute of Zoology, Center for Molecular Biosciences, University of Innsbruck, Technikerstraße 25, 6020 Innsbruck, Austria;
| | - Iva Sabolić
- Department of Biology, Faculty of Science, University of Zagreb, Rooseveltov trg 6, 10000 Zagreb, Croatia; (I.S.); (D.G.); (R.B.)
| | - Anita Erdelez
- Institute of Oceanography and Fisheries, Šetalište I. Meštrovića 63, 21000 Split, Croatia; (A.E.); (M.P.)
| | - Dorotea Grbin
- Department of Biology, Faculty of Science, University of Zagreb, Rooseveltov trg 6, 10000 Zagreb, Croatia; (I.S.); (D.G.); (R.B.)
| | - Martina Furdek Turk
- Division for Marine and Environmental Research, Ruđer Bošković Institute, Bijenička 54, 10000 Zagreb, Croatia;
| | - Robert Bakarić
- Department of Biology, Faculty of Science, University of Zagreb, Rooseveltov trg 6, 10000 Zagreb, Croatia; (I.S.); (D.G.); (R.B.)
| | - Melita Peharda
- Institute of Oceanography and Fisheries, Šetalište I. Meštrovića 63, 21000 Split, Croatia; (A.E.); (M.P.)
| | - Anamaria Štambuk
- Department of Biology, Faculty of Science, University of Zagreb, Rooseveltov trg 6, 10000 Zagreb, Croatia; (I.S.); (D.G.); (R.B.)
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Hiki K, Nakajima F, Tobino T. Application of cDNA-AFLP to biomarker exploration in a non-model species Grandidierella japonica. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2017; 140:206-213. [PMID: 28260686 DOI: 10.1016/j.ecoenv.2017.02.037] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2016] [Revised: 02/23/2017] [Accepted: 02/24/2017] [Indexed: 06/06/2023]
Abstract
Biomarkers of exposure can be used to identify specific contaminants that are adversely affecting aquatic organisms. However, it remains prohibitively costly to investigate multiple novel biomarkers of exposure in a non-model species, despite the development of next-generation sequencing technology. In this study, we focused on the use of cDNA-amplified fragment length polymorphism (AFLP) as a cost-effective biomarker discovery tool to test whether it could identify biomarkers of exposure in the non-model amphipod species Grandidierella japonica. Loci were identified that were differentially expressed in amphipods exposed to reference chemicals (Cu, Zn, and nicotine) and to an environmental sample (road dust) at sublethal concentrations. Eight loci were shown to respond consistently to nicotine at different concentrations, but not to Cu or Zn. Some of the loci also responded to an environmental road dust sample containing nicotine. These findings suggest that loci identified using cDNA-AFLP could be used as biomarkers of nicotine exposure in environmental samples with complex matrices. Further studies with other organisms and toxicants are needed, but we have demonstrated that the use of cDNA-AFLP to identify biomarkers for ecotoxicological studies of non-model species is at least feasible.
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Affiliation(s)
- Kyoshiro Hiki
- Department of Urban Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
| | - Fumiyuki Nakajima
- Department of Urban Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Tomohiro Tobino
- Environmental Science Center, The University of Tokyo, 7-3-1 Hongo, Bunkyo-Ku, Tokyo 113-0033, Japan
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Sedlacek J, Cortés AJ, Wheeler J, Bossdorf O, Hoch G, Klápště J, Lexer C, Rixen C, Wipf S, Karrenberg S, van Kleunen M. Evolutionary potential in the Alpine: trait heritabilities and performance variation of the dwarf willow Salix herbacea from different elevations and microhabitats. Ecol Evol 2016; 6:3940-52. [PMID: 27516856 PMCID: PMC4972222 DOI: 10.1002/ece3.2171] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2016] [Revised: 04/04/2016] [Accepted: 04/04/2016] [Indexed: 01/18/2023] Open
Abstract
Alpine ecosystems are seriously threatened by climate change. One of the key mechanisms by which plants can adapt to changing environmental conditions is through evolutionary change. However, we still know little about the evolutionary potential in wild populations of long-lived alpine plants. Here, we investigated heritabilities of phenological traits, leaf size, and performance traits in natural populations of the long-lived alpine dwarf shrub Salix herbacea using relatedness estimates inferred from SSR (Simple Sequence Repeat) markers. Salix herbacea occurs in early- and late-snowmelt microhabitats (ridges and snowbeds), and we assessed how performance consequences of phenological traits and leaf size differ between these microhabitats in order to infer potential for evolutionary responses. Salix herbacea showed low, but significant, heritabilities of leaf size, clonal and sexual reproduction, and moderate heritabilities of phenological traits. In both microhabitats, we found that larger leaves, longer intervals between snowmelt and leaf expansion, and longer GDD (growing-degree days) until leaf expansion resulted in a stronger increase in the number of stems (clonal reproduction). In snowbeds, clonal reproduction increased with a shorter GDD until flowering, while the opposite was found on ridges. Furthermore, the proportion of flowering stems increased with GDD until flowering in both microhabitats. Our results suggest that the presence of significant heritable variation in morphology and phenology might help S. herbacea to adapt to changing environmental conditions. However, it remains to be seen if the rate of such an evolutionary response can keep pace with the rapid rate of climate change.
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Affiliation(s)
- Janosch Sedlacek
- EcologyDepartment of BiologyUniversity of KonstanzUniversitätsstraße 1078457KonstanzGermany
| | - Andrés J. Cortés
- Department of Ecology and GeneticsUppsala UniversityNorbyvägen 18 D75236UppsalaSweden
- Present address: Department of Plant BiologySwedish Agricultural UniversityUndervisningsplan 7E75007UppsalaSweden
| | - Julia Wheeler
- WSL Institute for Snow and Avalanche Research SLFFlüelastrasse 117260DavosSwitzerland
- Institute of BotanyUniversity of BaselSchönbeinstrasse 64056BaselSwitzerland
- Present address: Department of Environmental ConservationUniversity of MassachusettsAmherstMassachusetts01003
| | - Oliver Bossdorf
- Plant Evolutionary EcologyInstitute of Evolution and EcologyAuf der Morgenstelle 5University of Tübingen72076TübingenGermany
| | - Guenter Hoch
- Institute of BotanyUniversity of BaselSchönbeinstrasse 64056BaselSwitzerland
| | - Jaroslav Klápště
- Department of Forest and Conservation SciencesFaculty of ForestryUniversity of British Columbia2424 Main MallVancouverBritish ColumbiaV6T 1Z4Canada
- Department of Genetics and Physiology of Forest TreesFaculty of Forestry and Wood SciencesCzech University of Life Sciences in PragueKamýcká 129165 21Prague 6Czech Republic
- Present address: Scion (New Zealand Forest Research Institute Ltd.)49 Sala StreetWhakarewarewa3046RotoruaNew Zealand
| | - Christian Lexer
- Department of Botany and Biodiversity ResearchUniversity of ViennaRennweg 14A‐1030ViennaAustria
| | - Christian Rixen
- WSL Institute for Snow and Avalanche Research SLFFlüelastrasse 117260DavosSwitzerland
| | - Sonja Wipf
- WSL Institute for Snow and Avalanche Research SLFFlüelastrasse 117260DavosSwitzerland
| | - Sophie Karrenberg
- Department of Ecology and GeneticsUppsala UniversityNorbyvägen 18 D75236UppsalaSweden
| | - Mark van Kleunen
- EcologyDepartment of BiologyUniversity of KonstanzUniversitätsstraße 1078457KonstanzGermany
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Strigolactone pathway genes and plant architecture: association analysis and QTL detection for horticultural traits in chrysanthemum. Mol Genet Genomics 2016; 291:957-69. [PMID: 26780913 DOI: 10.1007/s00438-015-1155-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2015] [Accepted: 12/08/2015] [Indexed: 12/27/2022]
Abstract
Chrysanthemums are important ornamental plants with abundant phenotypic diversity. Especially in cut-flower breeding, shoot branching is important for the success of new varieties. To assess the genetic regulation of shoot branching and other horticultural important traits, we phenotyped and genotyped two types of chrysanthemum populations: a genotype collection of 86 varieties and a biparental F1-population (MK11/3) of 160 individuals. Using two different statistical approaches, a genome-wide association analysis and a single marker ANOVA, with AFLP marker data and candidate gene markers for shoot branching, we tried to identify markers correlated to the traits of interest. As expected for the outcrossing hexasomic chrysanthemums most of the phenotypic traits showed a continuous variation in both populations. With the candidate gene approach we identified 11 significantly associated marker alleles for all 4 strigolactone pathway genes BRC1, CCD7, CCD8 and MAX2 regulating shoot branching in the genotype collection. In the MK11/3 we detected seven markers for all candidate genes except MAX2 explaining a large proportion of the variation. Using anonymous AFLP markers in the GWA with the 86 genotypes and the single locus analysis with the F1-population we could detect 15 and 17 additional marker-trait associations, respectively. Our analyses indicate a polygenic inheritance of the shoot branching in the chrysanthemum, with a fundamental role of the strigolactone pathway genes BRC1, CCD7, CCD8 and MAX2 and we identified 50 associated markers to all traits under study. These markers could be used in the selection of the parental plants for breeding chrysanthemums to enrich them for positive alleles influencing plant architecture traits.
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Alsdurf J, Anderson C, Siemens DH. Epigenetics of drought-induced trans-generational plasticity: consequences for range limit development. AOB PLANTS 2015; 8:plv146. [PMID: 26685218 PMCID: PMC4722181 DOI: 10.1093/aobpla/plv146] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2015] [Accepted: 11/19/2015] [Indexed: 05/26/2023]
Abstract
Genetic variation gives plants the potential to adapt to stressful environments that often exist beyond their geographic range limits. However, various genetic, physiological or developmental constraints might prevent the process of adaptation. Alternatively, environmentally induced epigenetic changes might sustain populations for several generations in stressful areas across range boundaries, but previous work on Boechera stricta, an upland mustard closely related to Arabidopsis, documented a drought-induced trans-generational plastic trade-off that could contribute to range limit development. Offspring of parents who were drought treated had higher drought tolerance, but lower levels of glucosinolate toxins. Both drought tolerance and defence are thought to be needed to expand the range to lower elevations. Here, we used methylation-sensitive amplified fragment length polymorphisms to determine whether environmentally induced DNA methylation and thus epigenetics could be a mechanism involved in the observed trans-generational plastic trade-off. We compared 110 offspring from the same self-fertilizing lineages whose parents were exposed to experimental drought stress treatments in the laboratory. Using three primer combinations, 643 polymorphic epi-loci were detected. Discriminant function analysis (DFA) on the amount of methylation detected resulted in significant combinations of epi-loci that distinguished the parent drought treatments in the offspring. Principal component (PC) and univariate association analyses also detected the significant differences, even after controlling for lineage, planting flat, developmental differences and multiple testing. Univariate tests also indicated significant associations between the amount of methylation and drought tolerance or glucosinolate toxin concentration. One epi-locus that was implicated in DFA, PC and univariate association analysis may be directly involved in the trade-off because increased methylation at this site on the genome decreased drought tolerance, but increased glucosinolate concentration.
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Affiliation(s)
- Jacob Alsdurf
- Integrative Genomics Program, Black Hills State University, Spearfish, SD 77799, USA Present address: Division of Biology, Kansas State University, Ackert Hall, Room 315, Manhattan, KS 66506-4901, USA
| | - Cynthia Anderson
- Integrative Genomics Program, Black Hills State University, Spearfish, SD 77799, USA
| | - David H Siemens
- Integrative Genomics Program, Black Hills State University, Spearfish, SD 77799, USA
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Cánovas JL, Jiménez JF, Mota JF, Gómez PS. Genetic diversity ofViola cazorlensisGand., an endemic species of Mediterranean dolomitic habitats: implications for conservation. SYST BIODIVERS 2015. [DOI: 10.1080/14772000.2015.1079275] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Medrano M, Herrera CM, Bazaga P. Epigenetic variation predicts regional and local intraspecific functional diversity in a perennial herb. Mol Ecol 2014; 23:4926-38. [DOI: 10.1111/mec.12911] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2014] [Revised: 08/19/2014] [Accepted: 09/04/2014] [Indexed: 01/04/2023]
Affiliation(s)
- Mónica Medrano
- Estación Biológica de Doñana; Consejo Superior de Investigaciones Científicas (CSIC); Avenida Américo Vespucio s/n Isla de La Cartuja Sevilla 41092 Spain
| | - Carlos M. Herrera
- Estación Biológica de Doñana; Consejo Superior de Investigaciones Científicas (CSIC); Avenida Américo Vespucio s/n Isla de La Cartuja Sevilla 41092 Spain
| | - Pilar Bazaga
- Estación Biológica de Doñana; Consejo Superior de Investigaciones Científicas (CSIC); Avenida Américo Vespucio s/n Isla de La Cartuja Sevilla 41092 Spain
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Moreira B, Castellanos MC, Pausas JG. Genetic component of flammability variation in a Mediterranean shrub. Mol Ecol 2014; 23:1213-23. [DOI: 10.1111/mec.12665] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2013] [Revised: 12/29/2013] [Accepted: 01/08/2014] [Indexed: 02/02/2023]
Affiliation(s)
- B. Moreira
- CIDE-CSIC; Ctra. Náquera Km. 4.5 46113 Montcada Valencia Spain
| | | | - J. G. Pausas
- CIDE-CSIC; Ctra. Náquera Km. 4.5 46113 Montcada Valencia Spain
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Westberg E, Ohali S, Shevelevich A, Fine P, Barazani O. Environmental effects on molecular and phenotypic variation in populations of Eruca sativa across a steep climatic gradient. Ecol Evol 2013; 3:2471-84. [PMID: 24567822 PMCID: PMC3930051 DOI: 10.1002/ece3.646] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2013] [Revised: 05/21/2013] [Accepted: 05/22/2013] [Indexed: 02/01/2023] Open
Abstract
In Israel Eruca sativa has a geographically narrow distribution across a steep climatic gradient that ranges from mesic Mediterranean to hot desert environments. These conditions offer an opportunity to study the influence of the environment on intraspecific genetic variation. For this, we combined an analysis of neutral genetic markers with a phenotypic evaluation in common-garden experiments, and environmental characterization of populations that included climatic and edaphic parameters, as well as geographic distribution. A Bayesian clustering of individuals from nine representative populations based on amplified fragment length polymorphism (AFLP) divided the populations into a southern and a northern geographic cluster, with one admixed population at the geographic border between them. Linear mixed models, with cluster added as a grouping factor, revealed no clear effects of environment or geography on genetic distances, but this may be due to a strong association of geography and environment with genetic clusters. However, environmental factors accounted for part of the phenotypic variation observed in the common-garden experiments. In addition, candidate loci for selection were identified by association with environmental parameters and by two outlier methods. One locus, identified by all three methods, also showed an association with trichome density and herbivore damage, in net-house and field experiments, respectively. Accordingly, we propose that because trichomes are directly linked to defense against both herbivores and excess radiation, they could potentially be related to adaptive variation in these populations. These results demonstrate the value of combining environmental and phenotypic data with a detailed genetic survey when studying adaptation in plant populations. This article describes the use of several types of data to estimate the influence of the environment on intraspecific genetic variation in populations originating from a steep climatic gradient. In addition to molecular marker data, we made use of phenotypic evaluation from common garden experiments, and a broad GIS based environmental data with edaphic information gathered in the field. This study, among others, lead to the identification of an outlier locus with an association to trichome formation and herbivore defense, and its ecological adaptive value is discussed.
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Affiliation(s)
- Erik Westberg
- Institute of Plant Sciences, Israel Plant Gene Bank, Agricultural Research Organization50250, Bet Dagan, Israel
- Institut für Spezielle Botanik und Botanischer Garten, Johannes Gutenberg-Universität MainzD-55099, Mainz, Germany
| | - Shachar Ohali
- Institute of Plant Sciences, Israel Plant Gene Bank, Agricultural Research Organization50250, Bet Dagan, Israel
| | - Anatoly Shevelevich
- Institute of Plant Sciences, Israel Plant Gene Bank, Agricultural Research Organization50250, Bet Dagan, Israel
- The Robert H. Smith Institute of Plant Sciences and Genetics in Agriculture, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem76100, Rehovot, Israel
| | - Pinchas Fine
- Department of Soil Chemistry, Plant Nutrition and Microbiology, Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization50250, Bet Dagan, Israel
| | - Oz Barazani
- Institute of Plant Sciences, Israel Plant Gene Bank, Agricultural Research Organization50250, Bet Dagan, Israel
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Divergent selection and local adaptation in disjunct populations of an endangered conifer, Keteleeria davidiana var. formosana (Pinaceae). PLoS One 2013; 8:e70162. [PMID: 23894608 PMCID: PMC3718774 DOI: 10.1371/journal.pone.0070162] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2013] [Accepted: 06/16/2013] [Indexed: 12/18/2022] Open
Abstract
The present study investigated the genetic diversity, population structure, FST outliers, and extent and pattern of linkage disequilibrium in five populations of Keteleeria davidiana var. formosana, which is listed as a critically endangered species by the Council of Agriculture, Taiwan. Twelve amplified fragment length polymorphism primer pairs generated a total of 465 markers, of which 83.74% on average were polymorphic across populations, with a mean Nei’s genetic diversity of 0.233 and a low level of genetic differentiation (approximately 6%) based on the total dataset. Linkage disequilibrium and HICKORY analyses suggested recent population bottlenecks and inbreeding in K. davidiana var. formosana. Both STRUCTURE and BAPS observed extensive admixture of individual genotypes among populations based on the total dataset in various clustering scenarios, which probably resulted from incomplete lineage sorting of ancestral variation rather than a high rate of recent gene flow. Our results based on outlier analysis revealed generally high levels of genetic differentiation and suggest that divergent selection arising from environmental variation has been driven by differences in temperature, precipitation, and humidity. Identification of ecologically associated outliers among environmentally disparate populations further support divergent selection and potential local adaptation.
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Wang T, Chen G, Zan Q, Wang C, Su YJ. AFLP genome scan to detect genetic structure and candidate loci under selection for local adaptation of the invasive weed Mikania micrantha. PLoS One 2012; 7:e41310. [PMID: 22829939 PMCID: PMC3400595 DOI: 10.1371/journal.pone.0041310] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2011] [Accepted: 06/25/2012] [Indexed: 11/18/2022] Open
Abstract
Why some species become successful invaders is an important issue in invasive biology. However, limited genomic resources make it very difficult for identifying candidate genes involved in invasiveness. Mikania micrantha H.B.K. (Asteraceae), one of the world's most invasive weeds, has adapted rapidly in response to novel environments since its introduction to southern China. In its genome, we expect to find outlier loci under selection for local adaptation, critical to dissecting the molecular mechanisms of invasiveness. An explorative amplified fragment length polymorphism (AFLP) genome scan was used to detect candidate loci under selection in 28 M. micrantha populations across its entire introduced range in southern China. We also estimated population genetic parameters, bottleneck signatures, and linkage disequilibrium. In binary characters, such as presence or absence of AFLP bands, if all four character combinations are present, it is referred to as a character incompatibility. Since character incompatibility is deemed to be rare in populations with extensive asexual reproduction, a character incompatibility analysis was also performed in order to infer the predominant mating system in the introduced M. micrantha populations. Out of 483 AFLP loci examined using stringent significance criteria, 14 highly credible outlier loci were identified by Dfdist and Bayescan. Moreover, remarkable genetic variation, multiple introductions, substantial bottlenecks and character compatibility were found to occur in M. micrantha. Thus local adaptation at the genome level indeed exists in M. micrantha, and may represent a major evolutionary mechanism of successful invasion. Interactions between genetic diversity, multiple introductions, and reproductive modes contribute to increase the capacity of adaptive evolution.
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Affiliation(s)
- Ting Wang
- CAS Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, China
| | - Guopei Chen
- CAS Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, China
- State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Qijie Zan
- Shenzhen Wildlife Rescue and Rehabilitation Center, Shenzhen, China
| | - Chunbo Wang
- State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Ying-juan Su
- State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, China
- * E-mail:
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Herrera CM. Genomic scan as a tool for assessing the genetic component of phenotypic variance in wild populations. Methods Mol Biol 2012; 888:315-29. [PMID: 22665289 DOI: 10.1007/978-1-61779-870-2_18] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Methods for estimating quantitative trait heritability in wild populations have been developed in recent years which take advantage of the increased availability of genetic markers to reconstruct pedigrees or estimate relatedness between individuals, but their application to real-world data is not exempt from difficulties. This chapter describes a recent marker-based technique which, by adopting a genomic scan approach and focusing on the relationship between phenotypes and genotypes at the individual level, avoids the problems inherent to marker-based estimators of relatedness. This method allows the quantification of the genetic component of phenotypic variance ("degree of genetic determination" or "heritability in the broad sense") in wild populations and is applicable whenever phenotypic trait values and multilocus data for a large number of genetic markers (e.g., amplified fragment length polymorphisms, AFLPs) are simultaneously available for a sample of individuals from the same population. The method proceeds by first identifying those markers whose variation across individuals is significantly correlated with individual phenotypic differences ("adaptive loci"). The proportion of phenotypic variance in the sample that is statistically accounted for by individual differences in adaptive loci is then estimated by fitting a linear model to the data, with trait value as the dependent variable and scores of adaptive loci as independent ones. The method can be easily extended to accommodate quantitative or qualitative information on biologically relevant features of the environment experienced by each sampled individual, in which case estimates of the environmental and genotype × environment components of phenotypic variance can also be obtained.
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Affiliation(s)
- Carlos M Herrera
- Estación Biológica de Doñana, Consejo Superior de Investigaciones Científicas (CSIC), Isla de La Cartuja, Sevilla, Spain.
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Anderson JT, Willis JH, Mitchell-Olds T. Evolutionary genetics of plant adaptation. Trends Genet 2011; 27:258-66. [PMID: 21550682 DOI: 10.1016/j.tig.2011.04.001] [Citation(s) in RCA: 211] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2011] [Revised: 04/11/2011] [Accepted: 04/11/2011] [Indexed: 10/18/2022]
Abstract
Plants provide unique opportunities to study the mechanistic basis and evolutionary processes of adaptation to diverse environmental conditions. Complementary laboratory and field experiments are important for testing hypotheses reflecting long-term ecological and evolutionary history. For example, these approaches can infer whether local adaptation results from genetic tradeoffs (antagonistic pleiotropy), where native alleles are best adapted to local conditions, or if local adaptation is caused by conditional neutrality at many loci, where alleles show fitness differences in one environment, but not in a contrasting environment. Ecological genetics in natural populations of perennial or outcrossing plants can also differ substantially from model systems. In this review of the evolutionary genetics of plant adaptation, we emphasize the importance of field studies for understanding the evolutionary dynamics of model and nonmodel systems, highlight a key life history trait (flowering time) and discuss emerging conservation issues.
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Affiliation(s)
- Jill T Anderson
- Institute for Genome Sciences and Policy, Department of Biology, Duke University, P.O. Box 90338, Durham, NC 27708, USA
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HERRERA CM, POZO MI, BAZAGA P. Clonality, genetic diversity and support for the diversifying selection hypothesis in natural populations of a flower-living yeast. Mol Ecol 2011; 20:4395-407. [DOI: 10.1111/j.1365-294x.2011.05217.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Cox K, Vanden Broeck A, Van Calster H, Mergeay J. Temperature-related natural selection in a wind-pollinated tree across regional and continental scales. Mol Ecol 2011; 20:2724-38. [PMID: 21623981 DOI: 10.1111/j.1365-294x.2011.05137.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Adaptive genetic variation is a key factor in evolutionary biology, but the detection of signatures of natural selection remains challenging in nonmodel organisms. We used a genome scan approach to detect signals of natural selection in the Black alder (Alnus glutinosa), a widespread wind-pollinated tree. Gene flow through pollen dispersal is believed to be high in this species, and we therefore expected to find a clear response to natural selection. In combination with two different landscape genetic approaches, we determined which environmental variables were most associated with the inferred selection. This analysis was performed on a regional scale (northern Belgium) and on a continental scale (Europe). Because climate-related differences are much more pronounced at the continental scale, we expected to find more selection-sensitive genetic markers across Europe than across northern Belgium. At both spatial scales, a substantial number of genetic loci were considered outliers, with respect to neutral expectations, and were therefore identified as selective. Based on results from our combined approach, four putative selective loci (or 2.5%) were recovered with high statistical support. Although these loci seemed to be associated with different environmental variables, they were mainly temperature-related. Our study demonstrates that the use of complementary methods in landscape genetics allows the discovery of selective loci which otherwise might stay hidden. In combination with a genome scan, the selective loci can be verified and the nature of the selection pressure can be identified.
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Affiliation(s)
- K Cox
- Research Institute for Nature and Forest, Gaverstraat 4, B-9500 Geraardsbergen, Belgium.
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Castellanos MC, Alcántara JM, Rey PJ, Bastida JM. Intra-population comparison of vegetative and floral trait heritabilities estimated from molecular markers in wild Aquilegia populations. Mol Ecol 2011; 20:3513-24. [PMID: 21504491 DOI: 10.1111/j.1365-294x.2011.05094.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Measuring heritable genetic variation is important for understanding patterns of trait evolution in wild populations, and yet studies of quantitative genetic parameters estimated directly in the field are limited by logistic constraints, such as the difficulties of inferring relatedness among individuals in the wild. Marker-based approaches have received attention because they can potentially be applied directly to wild populations. For long-lived, self-compatible plant species where pedigrees are inadequate, the regression-based method proposed by Ritland has the appeal of estimating heritabilities from marker-based estimates of relatedness. The method has been difficult to implement in some plant populations, however, because it requires significant variance in relatedness across the population. Here, we show that the method can be readily applied to compare the ability of different traits to respond to selection, within populations. For several taxa of the perennial herb genus Aquilegia, we estimated heritabilities of floral and vegetative traits and, combined with estimates of natural selection, compared the ability to respond to selection of both types of traits under current conditions. The intra-population comparisons showed that vegetative traits have a higher potential for evolution, because although they are as heritable as floral traits, selection on them is stronger. These patterns of potential evolution are consistent with macroevolutionary trends in the European lineage of the genus.
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Affiliation(s)
- Maria Clara Castellanos
- Consejo Superior de Investigaciones Científicas, Centro de Investigaciones sobre Desertificación, 46470 Albal, Valencia, Spain.
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Herrera CM, Bazaga P. Untangling individual variation in natural populations: ecological, genetic and epigenetic correlates of long-term inequality in herbivory. Mol Ecol 2011; 20:1675-88. [PMID: 21466603 DOI: 10.1111/j.1365-294x.2011.05026.x] [Citation(s) in RCA: 106] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Individual variation in ecologically important features of organisms is a crucial element in ecology and evolution, yet disentangling its underlying causes is difficult in natural populations. We applied a genomic scan approach using amplified fragment length polymorphism (AFLP) markers to quantify the genetic basis of long-term individual differences in herbivory by mammals at a wild population of the violet Viola cazorlensis monitored for two decades. In addition, methylation-sensitive amplified polymorphism (MSAP) analyses were used to investigate the association between browsing damage and epigenetic characteristics of individuals, an aspect that has been not previously explored for any wild plant. Structural equation modelling was used to identify likely causal structures linking genotypes, epigenotypes and herbivory. Individuals of V. cazorlensis differed widely in the incidence of browsing mammals over the 20-year study period. Six AFLP markers (1.6% of total) were significantly related to herbivory, accounting altogether for 44% of population-wide variance in herbivory levels. MSAP analyses revealed considerable epigenetic variation among individuals, and differential browsing damage was significantly related to variation in multilocus epigenotypes. In addition, variation across plants in epigenetic characteristics was related to variation in several herbivory-related AFLP markers. Statistical comparison of alternative causal models suggested that individual differences in herbivory are the outcome of a complex causal structure where genotypes and epigenotypes are interconnected and have direct and indirect effects on herbivory. Insofar as methylation states of MSAP markers influential on herbivory are transgenerationally heritable, herbivore-driven evolutionary changes at the study population will involve correlated changes in genotypic and epigenotypic distributions.
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Affiliation(s)
- C M Herrera
- Estación Biológica de Doñana, Consejo Superior de Investigaciones Científicas, Avenida Américo Vespucio s/n, Isla de La Cartuja, Sevilla 41092, Spain.
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Herrera CM. Marcescent corollas as functional structures: effects on the fecundity of two insect-pollinated plants. ANNALS OF BOTANY 2010; 106:659-662. [PMID: 20870656 PMCID: PMC2944983 DOI: 10.1093/aob/mcq160] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2010] [Revised: 06/21/2010] [Accepted: 07/03/2010] [Indexed: 05/29/2023]
Abstract
BACKGROUND AND AIMS Persistence of withered corollas after anthesis ('corolla marcescence') is widespread in angiosperms, yet its functional significance does not seem to have been explored for any species. This note reports the results of experiments assessing the fecundity effects of marcescent corollas in two southern Spanish insect-pollinated plants, Lavandula latifolia (Lamiaceae) and Viola cazorlensis (Violaceae). METHODS The effect of marcescent corollas on seed production was evaluated experimentally on wild-growing plants. Newly open flowers were randomly assigned to either control or treatment groups in experimental plants. After anthesis, withered corollas of treatment flowers were removed and those in control flowers were left in place. Fruits produced by treatment and control flowers were collected shortly before dehiscence and the number of seeds counted. KEY RESULTS In V. cazorlensis, removal of withered corollas had no effect on percentage of fruit set, but mean seeds per fruit increased from 9·5 to 11·4. In L. latifolia, corolla removal had no effect on the number of seeds per fruit, but reduced the proportion of flowers ripening fruit from 60 % to 40 %. The detrimental effect of corolla removal on L. latifolia fecundity resulted from the drastic increase in fruit infestation by seed-predatory cecidomyiid larvae, which occurred in 4 % and 34 % of control and treatment fruits, respectively. CONCLUSIONS Because of their potential effects on plant fecundity, marcescent corollas should not be dismissed a priori as biologically irrelevant leftovers from past floral functions. The simplicity of the experimental layout required to test for short-term fecundity effects of corolla marcescence should help to achieve a better understanding of the ecological and evolutionary correlates of this widespread but poorly understood trait.
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Affiliation(s)
- Carlos M Herrera
- Estación Biológica de Doñana, Consejo Superior de Investigaciones Científicas, Avenida Américo Vespucio s/n, Isla de La Cartuja, Seville, Spain.
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Anderson JT, Mitchell-Olds T. Ecological genetics and genomics of plant defenses: Evidence and approaches. Funct Ecol 2010; 25:312-324. [PMID: 21532968 DOI: 10.1111/j.1365-2435.2010.01785.x] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Herbivores exert significant selection on plants, and plants have evolved a variety of constitutive and inducible defenses to resist and tolerate herbivory. Assessing the genetic mechanisms that influence defenses against herbivores will deepen our understanding of the evolution of essential phenotypic traits.Ecogenomics is a powerful interdisciplinary approach that can address fundamental questions about the ecology and evolutionary biology of species, such as: which evolutionary forces maintain variation within a population? and What is the genetic architecture of adaptation? This field seeks to identify gene regions that influence ecologically-important traits, assess the fitness consequences under natural conditions of alleles at key quantitative trait loci (QTLs), and test how the abiotic and biotic environment affects gene expression.Here, we review ecogenomics techniques and emphasize how this framework can address long-standing and emerging questions relating to anti-herbivore defenses in plants. For example, ecogenomics tools can be used to investigate: inducible vs. constitutive defenses; tradeoffs between resistance and tolerance; adaptation to the local herbivore community; selection on alleles that confer resistance and tolerance in natural populations; and whether different genes are activated in response to specialist vs. generalist herbivores and to different types of damage.Ecogenomic studies can be conducted with model species, such as Arabidopsis, or their relatives, in which case myriad molecular tools are already available. Burgeoning sequence data will also facilitate ecogenomic studies of non-model species. Throughout this paper, we highlight approaches that are particularly suitable for ecological studies of non-model organisms, discuss the benefits and disadvantages of specific techniques, and review bioinformatic tools for analyzing data.We focus on established and promising techniques, such as QTL mapping with pedigreed populations, genome wide association studies, transcription profiling strategies, population genomics, and transgenic methodologies. Many of these techniques are complementary and can be used jointly to investigate the genetic architecture of defense traits and selection on alleles in nature.
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Affiliation(s)
- Jill T Anderson
- Institute for Genome Sciences and Policy, Department of Biology, Duke University, P.O. Box 90338, Durham, North Carolina 27708, USA
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Aragón CF, Méndez M, Escudero A. Linkages among life-history components through time: Carryover effects on the demography of a short-lived polycarpic plant. AMERICAN JOURNAL OF BOTANY 2010; 97:1492-7. [PMID: 21616903 DOI: 10.3732/ajb.1000072] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
PREMISE OF THE STUDY Current reproduction in polycarpic plants may be affected by a wide variety of factors, including carryover or "historical" effects derived from environments experienced early in life and from previous investments in organ preformation or other life functions, such as growth or reproduction. Historical effects as determinants of plant reproductive success in a specific season have received considerably less attention than events during the current reproductive episode, especially for short-lived plants. • METHODS We used structural equation modeling to assess direct and indirect relations between past reproduction and both subsequent reproduction and growth in Helianthemum squamatum, a short-lived polycarpic plant. Additionally, we explored the effects of current reproduction on future survival (binomial variable) by using logistic regression. • KEY RESULTS Historical effects derived from previous growth positively affected current reproduction, suggesting the existence of a reproductive hierarchy in the population, in which some individuals are consistently better growers and seeders. The lack of effects of current reproduction on future reproduction, together with the existence of a negative effect on future survival, suggests that to invest maximally in reproduction at the expense of a short life span may be the optimal strategy for H. squamatum, a species inhabiting very unpredictable ecosystems. • CONCLUSIONS Historical effects derived from past investments in growth or reproduction may have important consequences for current plant performance and may play an essential role in shaping life histories.
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Affiliation(s)
- Cristina F Aragón
- Área de Biodiversidad y Conservación, Departamento de Biología y Geología, Universidad Rey Juan Carlos, C/Tulipán s/n 28933 Móstoles, Madrid, Spain
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Herrera CM, Bazaga P. Epigenetic differentiation and relationship to adaptive genetic divergence in discrete populations of the violet Viola cazorlensis. THE NEW PHYTOLOGIST 2010; 187:867-76. [PMID: 20497347 DOI: 10.1111/j.1469-8137.2010.03298.x] [Citation(s) in RCA: 166] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
*In plants, epigenetic variations based on DNA methylation are often heritable and could influence the course of evolution. Before this hypothesis can be assessed, fundamental questions about epigenetic variation remain to be addressed in a real-world context, including its magnitude, structuring within and among natural populations, and autonomy in relation to the genetic context. *Extent and patterns of cytosine methylation, and the relationship to adaptive genetic divergence between populations, were investigated for wild populations of the southern Spanish violet Viola cazorlensis (Violaceae) using the methylation-sensitive amplified polymorphism (MSAP) technique, a modification of the amplified fragment length polymorphism method (AFLP) based on the differential sensitivity of isoschizomeric restriction enzymes to site-specific cytosine methylation. *The genome of V. cazorlensis plants exhibited extensive levels of methylation, and methylation-based epigenetic variation was structured into distinct between- and within- population components. Epigenetic differentiation of populations was correlated with adaptive genetic divergence revealed by a Bayesian population-genomic analysis of AFLP data. Significant associations existed at the individual genome level between adaptive AFLP loci and the methylation state of methylation-susceptible MSAP loci. *Population-specific, divergent patterns of correlated selection on epigenetic and genetic individual variation could account for the coordinated epigenetic-genetic adaptive population differentiation revealed by this study.
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Affiliation(s)
- Carlos M Herrera
- Estación Biológica de Doñana, Consejo Superior de Investigaciones Científicas (CSIC), Isla de La Cartuja, Sevilla, Spain.
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Herrera CM, Jovani R. Lognormal distribution of individual lifetime fecundity: insights from a 23-year study. Ecology 2010; 91:422-30. [PMID: 20392007 DOI: 10.1890/09-0849.1] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Individual variance in lifetime fecundity within populations is a life-history parameter of crucial evolutionary and ecological significance. However, knowledge of its magnitude and underlying mechanisms in natural populations is biased toward short-lived taxa. This paper summarizes results of a 23-year study on a population of the Mediterranean shrub Lavandula latifolia. We document the within-population pattern of individual variation in instantaneous and lifetime fecundity (as estimated by inflorescence production) and explore the mechanisms producing the lognormal distribution of individual fecundities by means of an individual-based simulation model. Throughout the study period, a few individuals consistently produced most inflorescences while the majority of plants exhibited moderate-to-low fecundities. The shape of yearly distributions of annual fecundities varied little across years, and most annual fecundity distributions did not depart significantly from a lognormal. The distribution of individual lifetime fecundity did not depart from lognormality. Despite the simplicity of the premises of our simulation model, it was remarkably successful at predicting the shapes of fecundity distributions and the early establishment of a persistent fecundity hierarchy. The agreement between model results and empirical data supports the view that multiplicative interactions of randomly varying environmental effects can play a central role in determining individual variation in lifetime fecundity in L. latifolia, and suggests that environmental stochasticity can be decisive in the genesis of strong fecundity hierarchies in long-lived plants.
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Affiliation(s)
- Carlos M Herrera
- Estación Biológica de Doñana, CSIC, Américo Vespuccio s/n, E-41092 Sevilla, Spain.
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