International Database for Barley Genes and Barley Genetic Stocks
BGS 334, Smooth awn 6, raw6
Stock number: BGS 334
Locus name: Smooth awn 6
Locus symbol: raw6
Previous nomenclature and gene symbolization:
Smooth awn 6 = r6 (2).
Monofactorial recessive (1).
Located in chromosome 5HL (2); raw6.f is near the raw1 (smooth awn 1) locus based on linkage drag (2).
Plants have very fewer stigma hairs and seed set is greatly reduced. In the Bowman backcross-derived line, which contains the raw6.f and raw1.a genes, plants have very smooth awns and very few stigma hairs, and seed set is commonly less than 5%. Phenotypically, raw6.f plants closely resemble those produced by the raw5.e (smooth awn 5) gene. Recombination between the raw6.f and raw1.a genes is low because a recombinant was isolated only after several backcrosses to Bowman.
Origin of mutant:
A sodium azide induced mutant in Glenn (CIho 15769) (1).
raw6.f (GSHO 2437) in Glenn (CIho 15769) (1).
Mutant used for description and seed stocks:
raw6.f (GSHO 2437) in Glenn; raw6.f in Bowman (PI 483237)*8 (GSHO 2134, BW665, NGB 22229).
1. Faue, A.C. 1987. Chemical mutagenesis as a breeding tool for barley. M.S. Thesis. North Dakota State Univ., Fargo.
2. Franckowiak, J.D. 1995. Notes on linkage drag in Bowman backcross derived lines of spring barley. Barley Genet. Newsl. 24:63-70.
J.D. Franckowiak. 1997. Barley Genet. Newsl. 26:282.