International Database for Barley Genes and Barley Genetic Stocks
BGS 26, Subnodal bract 1, snb1
Stock number: BGS 26
Locus name: Subnodal bract 1
Locus symbol: snb1
Previous nomenclature and gene symbolization:
Subnodal bract = sb (4, 5).
Inheritance:
Monofactorial recessive (4).
Located in chromosome 7HS (3, 5); snb1 is near the centromere of chromosome 2H (3);snb1.a is about 36.3 cM proximal from the brh1 (brachytic 1) locus (5).
Located in chromosome 7HS (3, 5); snb1 is near the centromere of chromosome 2H (3);snb1.a is about 36.3 cM proximal from the brh1 (brachytic 1) locus (5).
Description:
A glume-like or stick-like bract arises immediately under the node-base (below and between the outer glumes) of the central spikelets. The bracts are present at only a few internodes on randomly arranged central spikelets. Expression of the subnodal bract trait is variable because not all spikes on homozygous snb1.a plants have the extra bract (5). The subnodal bract trait was not observed in progeny from crosses to Bowman; however, the Bowman backcross-derived line for snb1.a (BW872) contains donor parent markers for 7H in the critical region (1, 2).
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Origin of mutant:
Natural occurrence in L50-220 (Hordeum sativum var ibericum1) from Russia Alb Acc 67a, GSHO 1217) (5).
Mutational events:
snb1.a in L50-200 (GSHO 1217, Alb Acc 67A) (2, 5), a recessive allele at the brh1 (brachytic 1) locus is present also in this stock (5).
Mutant used for description and seed stocks:
snb1.a (GSHO 1217) in L50-200; snb1.a is likely present in Bowman backcross line BW372 (Bowman*2/L50-200), but the trait was not observed (1, 2).snb1.a (GSHO 1217) in L50-200; snb1.a is likely present in Bowman backcross line BW372 (Bowman*2/L50-200), but the trait was not observed (1, 2).snb1.a (GSHO 1217) in L50-200; snb1.a is likely present in Bowman backcross-derived line BW372 (Bowman*2/L50-200), but the trait was not observed (1, 2).
References:
1. Druka, A., J. Franckowiak, U. Lundqvist, N. Bonar, J. Alexander, K. Houston, S. Radovic, F. Shahinnia, V. Vendramin, M. Morgante, N. Stein, and R. Waugh. 2011. Genetic dissection of barley morphology and development. Plant Physiol. 155:617-627.
2. Franckowiak, J.D. (Unpublished).
3. Fedak, G., T. Tsuchiya, and S.B. Helgason. 1972. Use of monotelotrisomics for linkage mapping in barley. Can. J. Genet. Cytol. 14:949-957.
4. Walker, G.W., K. Kasha, and R.A. Miller. 1958. Recombination studies in barley. Proc. Genet. Soc. Can. 3:41-43.
5. Walker, G.W.R., J. Dietrich, R. Miller, and K.J. Kasha. 1963. Recent barley mutants and their linkages II. Genetic data for further mutants. Can. J. Genet. Cytol. 5:200-219.
2. Franckowiak, J.D. (Unpublished).
3. Fedak, G., T. Tsuchiya, and S.B. Helgason. 1972. Use of monotelotrisomics for linkage mapping in barley. Can. J. Genet. Cytol. 14:949-957.
4. Walker, G.W., K. Kasha, and R.A. Miller. 1958. Recombination studies in barley. Proc. Genet. Soc. Can. 3:41-43.
5. Walker, G.W.R., J. Dietrich, R. Miller, and K.J. Kasha. 1963. Recent barley mutants and their linkages II. Genetic data for further mutants. Can. J. Genet. Cytol. 5:200-219.
Prepared:
J.D. Franckowiak. 1997. Barley Genet. Newsl. 26:72.
Revised:
J.D. Franckowiak. 2018. Barley Genet. Newsl. 48:67
