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Title: Global Diversity of the Brachypodium Species Complex as a Resource for Genome-Wide Association Studies Demonstrated for Agronomic Traits in Response to Climate

Journal Article · · Genetics
 [1]; ORCiD logo [1];  [1];  [1];  [2];  [1];  [3];  [1];  [4];  [4]; ORCiD logo [1]
  1. Australian National Univ., Canberra, ACT (Australia)
  2. Univ. of California, San Diego, CA (United States); Australian National Univ., Canberra, ACT (Australia)
  3. United States Department of Agriculture (USDA), St. Paul, MN (United States)
  4. USDOE Joint Genome Institute (JGI), Walnut Creek, CA (United States)

The development of model systems requires a detailed assessment of standing genetic variation across natural populations. The Brachypodium species complex has been promoted as a plant model for grass genomics with translation to small grain and biomass crops. To capture the genetic diversity within this species complex, thousands of Brachypodium accessions from around the globe were collected and genotyped by sequencing. Overall, 1897 samples were classified into two diploid or allopolyploid species, and then further grouped into distinct inbred genotypes. A core set of diverse B. distachyon diploid lines was selected for whole genome sequencing and high resolution phenotyping. Genome-wide association studies across simulated seasonal environments was used to identify candidate genes and pathways tied to key life history and agronomic traits under current and future climatic conditions. A total of 8, 22, and 47 QTL were identified for flowering time, early vigor, and energy traits, respectively. The results highlight the genomic structure of the Brachypodium species complex, and the diploid lines provided a resource that allows complex trait dissection within this grass model species.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Contributing Organization:
Accession Contributors
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1493985
Journal Information:
Genetics, Vol. 211, Issue 1; ISSN 0016-6731
Publisher:
Genetics Society of AmericaCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 12 works
Citation information provided by
Web of Science

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Cited By (2)

Genetic Variation for Seed Metabolite Levels in Brachypodium distachyon journal May 2019
Extending the Genotype in Brachypodium by Including DNA Methylation Reveals a Joint Contribution with Genetics on Adaptive Traits journal May 2020