Misexpression of a transcriptional repressor candidate provides a molecular mechanism for the suppression of awns by Tipped 1 in wheat

Abstract Awns are bristle-like structures formed at the tip of the lemma on the florets of some cereal grasses. Wild-type wheat is awned, but awnletted and awnless variants have been selected and nowadays all forms are cultivated. In this study, we dissected the genetic control underlying variation of this characteristic feature by association mapping in a large panel of 1110 winter wheat cultivars of worldwide origin. We identified the B1 (Tipped 1) locus on chromosome 5A as the major determinant of awnlessness globally. Using a combination of fine-mapping and expression analysis, we identified a putative C2H2 zinc finger protein with an EAR domain, characteristic of transcriptional repressors, as a likely candidate for Tipped 1. This gene was found to be up-regulated in awnless B1 compared with awned b1 plants, indicating that misexpression of this transcriptional regulator may contribute to the reduction of awn length in B1 plants. Taken together, our study provides an entry point towards a better molecular understanding of the evolution of morphological features in cereals through selection and breeding.

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  • Name: Würschum, Tobias, Type: Corresponding Author,
  • Name: Jähne, Felix, Type: Corresponding Author,
  • Name: Phillips, Andrew L, Type: Corresponding Author,
  • Name: Langer, Simon M, Type: Corresponding Author,
  • Name: Longin, C Friedrich H, Type: Corresponding Author,
  • Name: Tucker, Matthew R, Type: Corresponding Author,
  • Name: Leiser, Willmar L, Type: Corresponding Author,
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Article License Type cc-by
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Citation Report https://scite.ai/reports/10.1093/jxb/eraa106
DFW Organisation RRes
DFW Work Package 1
DOI 10.1093/jxb/eraa106
Date Last Updated 2022-09-15T14:17:07.149672
Evidence open (via crossref license)
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Open Access Status hybrid
PDF URL https://academic.oup.com/jxb/article-pdf/71/12/3428/33415546/eraa106.pdf
Publisher URL https://doi.org/10.1093/jxb/eraa106