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Rachis brittleness in a hybrid–parent barley (Hordeum vulgare) breeding germplasm with different combinations at the non‐brittle rachis genes

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Issue date
2020
Author
Fernández Calleja, Miriam
Casas Cendoya, Ana Maria
Pérez Torres, Antonio
Gracia Gimeno, Ma. Pilar
Igartua Arregui, Ernesto
Suggested citation
Fernández Calleja, Miriam; Casas Cendoya, Ana Maria; Pérez Torres, Antonio; Gracia Gimeno, Ma. Pilar; Igartua Arregui, Ernesto; . (2020) . Rachis brittleness in a hybrid–parent barley (Hordeum vulgare) breeding germplasm with different combinations at the non‐brittle rachis genes. Plant Breeding, 2020, vol. 139, núm. 2, p. 317-327. https://doi.org/10.1111/pbr.12776.
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Abstract
Two dominant, closely linked and complementary genes, Btr1 and Btr2, control rachis brittleness in barley. Recessive mutations in any of these genes turn the fragile rachis (brittle) into a tough rachis phenotype (non‐brittle). The cross of parents with alternative mutations in the btr genes leads to a brittle F1 hybrid that presents grain retention problems. We evaluated rachis fragility through a mechanical test and under natural conditions, in F1 crosses with different compositions at the btr genes. Brittleness was significantly higher in Btr1btr1Btr2btr2 crosses compared to hybrids and inbred parents carrying one of the mutations (btr1btr1Btr2Btr2/Btr1Btr1btr2btr2). This fact could jeopardize the efficient harvest of hybrids bearing alternative mutations, reducing the choice of possible crosses for hybrid barley breeding and hindering the exploitation of potential heterotic patterns. Furthermore, non‐brittle hybrids showed higher brittleness than inbreds, suggesting the presence of other dominant factors affecting the trait. In conclusion, this work encourages a deeper study of the genetic control of the rachis brittleness trait and urges the consideration of rachis tenacity as a target for hybrid barley breeding.
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http://hdl.handle.net/10459.1/83146
DOI
https://doi.org/10.1111/pbr.12776
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Plant Breeding, 2020, vol. 139, núm. 2, p. 317-327
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  • Articles publicats (Producció Vegetal i Ciència Forestal) [851]

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