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Title: Genetic Architecture of Flowering-Time Variation in Brachypodium distachyon

The transition to reproductive development is a crucial step in the plant life cycle, and the timing of this transition is an important factor in crop yields. Here, we report new insights into the genetic control of natural variation in flowering time in Brachypodium distachyon, a nondomesticated pooid grass closely related to cereals such as wheat (Triticum spp.) and barley (Hordeum vulgare L.). A recombinant inbred line population derived from a cross between the rapid-flowering accession Bd21 and the delayed-flowering accession Bd1-1 were grown in a variety of environmental conditions to enable exploration of the genetic architecture of flowering time. A genotyping-by-sequencing approach was used to develop SNP markers for genetic map construction, and quantitative trait loci (QTLs) that control differences in flowering time were identified. Many of the flowering-time QTLs are detected across a range of photoperiod and vernalization conditions, suggesting that the genetic control of flowering within this population is robust. The two major QTLs identified in undomesticated B. distachyon colocalize with VERNALIZATION1/PHYTOCHROME C and VERNALIZATION2, loci identified as flowering regulators in the domesticated crops wheat and barley. This suggests that variation in flowering time is controlled in part by a set of genes broadly conserved within pooidmore » grasses.« less
ORCiD logo [1] ;  [2] ; ORCiD logo [2] ; ORCiD logo [3] ; ORCiD logo [3] ;  [4] ; ORCiD logo [1]
  1. Univ. of Wisconsin, Madison, WI (United States). Lab. of Genetics; Univ. of Wisconsin, Madison, WI (United States). USDOE Great Lakes Bioenergy Research Center; Univ. of Wisconsin, Madison, WI (United States). Dept. of Biochemistry
  2. Univ. of Wisconsin, Madison, WI (United States). Dept. of Biochemistry
  3. USDOE Joint Genome Institute (JGI), Walnut Creek, CA (United States)
  4. Univ. of Minnesota, St. Paul, MN (United States). Dept. of Agronomy and Plant Genetics, USDA-ARS Plant Science Research Unit
Publication Date:
Grant/Contract Number:
AC02-05CH11231; SC0006999; FCO2-07ER64494; IOS-1258126
Accepted Manuscript
Journal Name:
Plant Physiology (Bethesda)
Additional Journal Information:
Journal Name: Plant Physiology (Bethesda); Journal Volume: 173; Journal Issue: 1; Journal ID: ISSN 0032-0889
American Society of Plant Biologists
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23); National Science Foundation (NSF); National Institutes of Health (NIH)
Country of Publication:
United States
OSTI Identifier: