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Title: Population structure in the model grass Brachypodium distachyon is highly correlated with flowering differences across broad geographic areas

Abstract

The small, annual grass Brachypodium distachyon (L.) Beauv., a close relative of wheat (Triticum aestivum L.) and barley (Hordeum vulgare L.), is a powerful model system for cereals and bioenergy grasses. Genome-wide association studies (GWAS) of natural variation can elucidate the genetic basis of complex traits but have been so far limited in B. distachyon by the lack of large numbers of well-characterized and sufficiently diverse accessions. Here, we report on genotyping-by-sequencing (GBS) of 84 B. distachyon, seven B. hybridum, and three B. stacei accessions with diverse geographic origins including Albania, Armenia, Georgia, Italy, Spain, and Turkey. Over 90,000 high-quality single-nucleotide polymorphisms (SNPs) distributed across the Bd21 reference genome were identified. Our results confirm the hybrid nature of the B. hybridum genome, which appears as a mosaic of B. distachyon-like and B. stacei-like sequences. Analysis of more than 50,000 SNPs for the B. distachyon accessions revealed three distinct, genetically defined populations. Surprisingly, these genomic profiles are associated with differences in flowering time rather than with broad geographic origin. High levels of differentiation in loci associated with floral development support the differences in flowering phenology between B. distachyon populations. Genome-wide association studies combining genotypic and phenotypic data also suggest the presencemore » of one or more photoperiodism, circadian clock, and vernalization genes in loci associated with flowering time variation within B. distachyon populations. As a result, our characterization elucidates genes underlying population differences, expands the germplasm resources available for Brachypodium, and illustrates the feasibility and limitations of GWAS in this model grass.« less

Authors:
 [1];  [1];  [1];  [1];  [2];  [3];  [1];  [4];  [5];  [1];  [1]
  1. Univ. of Massachusetts, Amherst, MA (United States)
  2. ETSIA, Technical Univ. of Madrid, Madrid (Spain)
  3. The Ohio State Univ.-Lima, Lima, OH (United States)
  4. Univ. of Florence, Florence (Italy)
  5. Univ. di Palermo, Palermo (Italy)
Publication Date:
Research Org.:
Univ. of California, San Diego, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
OSTI Identifier:
1312966
Grant/Contract Number:  
SC0006621
Resource Type:
Accepted Manuscript
Journal Name:
The Plant Genome
Additional Journal Information:
Journal Volume: 9; Journal Issue: 2; Journal ID: ISSN 1940-3372
Publisher:
Alliance of Crop, Soil, and Environmental Science Societies
Country of Publication:
United States
Language:
English
Subject:
09 BIOMASS FUELS

Citation Formats

Tyler, Ludmila, Lee, Scott J., Young, Nelson D., DeIulio, Gregory A., Benavente, Elena, Reagon, Michael, Sysopha, Jessica, Baldini, Riccardo M., Troia, Angelo, Hazen, Samuel P., and Caicedo, Ana L. Population structure in the model grass Brachypodium distachyon is highly correlated with flowering differences across broad geographic areas. United States: N. p., 2016. Web. doi:10.3835/plantgenome2015.08.0074.
Tyler, Ludmila, Lee, Scott J., Young, Nelson D., DeIulio, Gregory A., Benavente, Elena, Reagon, Michael, Sysopha, Jessica, Baldini, Riccardo M., Troia, Angelo, Hazen, Samuel P., & Caicedo, Ana L. Population structure in the model grass Brachypodium distachyon is highly correlated with flowering differences across broad geographic areas. United States. https://doi.org/10.3835/plantgenome2015.08.0074
Tyler, Ludmila, Lee, Scott J., Young, Nelson D., DeIulio, Gregory A., Benavente, Elena, Reagon, Michael, Sysopha, Jessica, Baldini, Riccardo M., Troia, Angelo, Hazen, Samuel P., and Caicedo, Ana L. Fri . "Population structure in the model grass Brachypodium distachyon is highly correlated with flowering differences across broad geographic areas". United States. https://doi.org/10.3835/plantgenome2015.08.0074. https://www.osti.gov/servlets/purl/1312966.
@article{osti_1312966,
title = {Population structure in the model grass Brachypodium distachyon is highly correlated with flowering differences across broad geographic areas},
author = {Tyler, Ludmila and Lee, Scott J. and Young, Nelson D. and DeIulio, Gregory A. and Benavente, Elena and Reagon, Michael and Sysopha, Jessica and Baldini, Riccardo M. and Troia, Angelo and Hazen, Samuel P. and Caicedo, Ana L.},
abstractNote = {The small, annual grass Brachypodium distachyon (L.) Beauv., a close relative of wheat (Triticum aestivum L.) and barley (Hordeum vulgare L.), is a powerful model system for cereals and bioenergy grasses. Genome-wide association studies (GWAS) of natural variation can elucidate the genetic basis of complex traits but have been so far limited in B. distachyon by the lack of large numbers of well-characterized and sufficiently diverse accessions. Here, we report on genotyping-by-sequencing (GBS) of 84 B. distachyon, seven B. hybridum, and three B. stacei accessions with diverse geographic origins including Albania, Armenia, Georgia, Italy, Spain, and Turkey. Over 90,000 high-quality single-nucleotide polymorphisms (SNPs) distributed across the Bd21 reference genome were identified. Our results confirm the hybrid nature of the B. hybridum genome, which appears as a mosaic of B. distachyon-like and B. stacei-like sequences. Analysis of more than 50,000 SNPs for the B. distachyon accessions revealed three distinct, genetically defined populations. Surprisingly, these genomic profiles are associated with differences in flowering time rather than with broad geographic origin. High levels of differentiation in loci associated with floral development support the differences in flowering phenology between B. distachyon populations. Genome-wide association studies combining genotypic and phenotypic data also suggest the presence of one or more photoperiodism, circadian clock, and vernalization genes in loci associated with flowering time variation within B. distachyon populations. As a result, our characterization elucidates genes underlying population differences, expands the germplasm resources available for Brachypodium, and illustrates the feasibility and limitations of GWAS in this model grass.},
doi = {10.3835/plantgenome2015.08.0074},
journal = {The Plant Genome},
number = 2,
volume = 9,
place = {United States},
year = {Fri Apr 29 00:00:00 EDT 2016},
month = {Fri Apr 29 00:00:00 EDT 2016}
}

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A Robust, Simple Genotyping-by-Sequencing (GBS) Approach for High Diversity Species
journal, May 2011


Inferring weak population structure with the assistance of sample group information
journal, September 2009


The microRNA regulated SBP-box genes SPL9 and SPL15 control shoot maturation in Arabidopsis
journal, February 2008


Painting the chromosomes of Brachypodium—current status and future prospects
journal, June 2011


Recombination and linkage disequilibrium in Arabidopsis thaliana
journal, August 2007

  • Kim, Sung; Plagnol, Vincent; Hu, Tina T.
  • Nature Genetics, Vol. 39, Issue 9
  • DOI: 10.1038/ng2115

LOST MERISTEMS genes regulate cell differentiation of central zone descendants in Arabidopsis shoot meristems: LOM genes control meristem maintenance
journal, October 2010


Genome-wide association studies in plants: the missing heritability is in the field
journal, January 2011


Painting the chromosomes of Brachypodium—current status and future prospects
journal, June 2011


Selection and phenotypic characterization of a core collection of Brachypodium distachyon inbred lines
journal, January 2014


Genome diversity in Brachypodium distachyon: deep sequencing of highly diverse inbred lines
journal, July 2014

  • Gordon, Sean P.; Priest, Henry; Des Marais, David L.
  • The Plant Journal, Vol. 79, Issue 3
  • DOI: 10.1111/tpj.12569

Approximate Bayesian Computation in Population Genetics
journal, December 2002


Inference of Population Structure Using Multilocus Genotype Data: Linked Loci and Correlated Allele Frequencies
journal, August 2003


Inference of Population Structure Using Multilocus Genotype Data
journal, June 2000


Works referencing / citing this record:

Extensive gene content variation in the Brachypodium distachyon pan-genome correlates with population structure
text, January 2017

  • Gordon, Sean P.; Contreras-Moreira, Bruno; Woods, Daniel P.
  • Nature Publishing Group
  • DOI: 10.5167/uzh-148888

Comparative plastome genomics and phylogenomics of Brachypodium : flowering time signatures, introgression and recombination in recently diverged ecotypes
journal, December 2017

  • Sancho, Rubén; Cantalapiedra, Carlos P.; López-Alvarez, Diana
  • New Phytologist, Vol. 218, Issue 4
  • DOI: 10.1111/nph.14926

Evolutionary processes from the perspective of flowering time diversity
journal, October 2019

  • Gaudinier, Allison; Blackman, Benjamin K.
  • New Phytologist, Vol. 225, Issue 5
  • DOI: 10.1111/nph.16205

Colonization history of the Canary Islands endemic Lavatera acerifolia, (Malvaceae) unveiled with genotyping‐by‐sequencing data and niche modelling
journal, April 2020

  • Villa‐Machío, Irene; Fernández de Castro, Alejandro G.; Fuertes‐Aguilar, Javier
  • Journal of Biogeography, Vol. 47, Issue 4
  • DOI: 10.1111/jbi.13808

Extensive gene content variation in the Brachypodium distachyon pan-genome correlates with population structure
journal, December 2017

  • Gordon, Sean P.; Contreras-Moreira, Bruno; Woods, Daniel P.
  • Nature Communications, Vol. 8, Issue 1
  • DOI: 10.1038/s41467-017-02292-8

DNA-Based Assessment of Genetic Diversity in Grassland Plant Species: Challenges, Approaches, and Applications
text, January 2019


DNA-Based Assessment of Genetic Diversity in Grassland Plant Species: Challenges, Approaches, and Applications
journal, December 2019


Genome-wide scans of selection highlight the impact of biotic and abiotic constraints in natural populations of the model grass Brachypodium distachyon
journal, September 2018

  • Bourgeois, Yann; Stritt, Christoph; Walser, Jean-Claude
  • The Plant Journal, Vol. 96, Issue 2
  • DOI: 10.1111/tpj.14042

Environmental isolation explains Iberian genetic diversity in the highly homozygous model grass Brachypodium distachyon
journal, June 2017

  • Marques, Isabel; Shiposha, Valeriia; López-Alvarez, Diana
  • BMC Evolutionary Biology, Vol. 17, Issue 1
  • DOI: 10.1186/s12862-017-0996-x