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GrainGenes Gene Class Report: Brittle rachis

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Gene Class	Brittle rachis
LINK	Brittle rachis genes at Komugi: Catalog of Gene Symbols for Wheat
Character affected	Rachis fragility
Gene	btr1 (Hordeum) [ Show all 10 ]
Allele	Btr1 (Hordeum) btr1 (Hordeum)
Locus	btr1 btr1/btr2 btr2 Br-A1 Br-B1
Comment	Brittle rachis in T. durum was defined as a spike that disarticulated when the tip was bent by 45 degrees relative to the peduncle (Watanabe, 2005). In chromosome substitution lines of wild emmer to common wheat, the 3AS derivative was more brittle than the 3BS derivative (Millet et al. 2013). Wedge (W) type disarticulation is associated with the Br-1 gene set whereas barrel (B) type disarticulation is caused by a different gene and is limited to species with the D genome (Li and Gill, 2006).
Wheat Gene Catalog Reference	10974 Millet E et al. (2013) Production of chromosome-arm substitution lines of wild emmer in common wheat Euphytica 190:1-17. 11080 Li W and Gill BS (2006) Multiple genetic pathways for seed shattering in the grasses. Functional and Integrative Genomics 6:300-309. 10242 Watanabe N (2005) The occurrence and inheritance of a brittle rachis phenotype in Italian durum wheat cultivars. Euphytica 142:247-251.
Data Curator	Cooper, Laurel Jan-2020

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