International Database for Barley Genes and Barley Genetic Stocks
BGS 83, Slender dwarf 2, sld2
Stock number: BGS 83
Locus name: Slender dwarf 2
Locus symbol: sld2
Previous nomenclature and gene symbolization:
Monofactorial recessive (4).
Located in chromosome 2HS (4); sld2.b is over 18.2 cM distal from the eog1 (elongated outer glume 1) locus (4); sld2.b is associated with SNP markers 1_1505 to 1_0325 (positions 81.43 to 90.54 cM) in 2H bins 06 to 07 of the Bowman backcross-derived line BW862 (1).
Mutant plants have short and slender culms, narrow leaves, short and lax spikes, and thin kernels (4). When grown at Langdon, North Dakota, USA, semi-dwarf plants were difficult to identify in progenies from crosses between OUM142 and two-rowed spring barley. The frequency of semidwarf, late maturing plants is low because sld2.b is linked to an Eam1 (early maturity 1) gene in the repulsion phase (3). Plant vigor and heading dates were highly variable across trial locations for the Bowman backcross-derived line for sld2.b, BW862. Plants headed 18 days later and were half as tall when grown near Dundee, Scotland, while plants were nearly normal at Aberdeen, Idaho. Grain yields for BW862 ranged from less than 10% to over 80% of the Bowman yields (2).
Origin of mutant:
An ethyl methanesulfonate induced mutant in Akashinriki (OUJ659, PI 467400) (4).
sld2.b (OUM142, GSHO 2491) in Akashinriki (OUJ659, PI 467400) (4).
Mutant used for description and seed stocks:
sld2.b (OUM 142, GSHO 2491) in Akashinriki; sld2.b in Bowman (PI 483237)*4 (GSHO 1876); sld2.b in Bowman*7 (BW862, NGB 22299).
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. 2010. Genetic dissection of barley morphology and development. Plant Physiol. 155:617-627.
2. Franckowiak, J.D. (Unpublished).
3. Franckowiak, J.D. 1995. Notes on linkage drag in Bowman backcross derived lines of spring barley. Barley Genet. Newsl. 24:63-70.
4. Hayashi, J., T. Konishi, I. Moraiya, and R. Takahashi. 1984. Inheritance and studies in barley. VI. Ten mutant genes located on chromosomes 1 to 7, except 3. Ber. Ohara Inst. landw. Biol., Okayama Univ. 18:227-250.
T. Konishi and J.D. Franckowiak. 1997. Barley Genet. Newsl. 26:121.
J.D. Franckowiak. 2014. Barley Genet. Newsl. 44:74.