International Database for Barley Genes and Barley Genetic Stocks
BGS 133, Semidwarf 2, sdw2
Stock number: BGS 133
Locus name: Semidwarf 2
Locus symbol: sdw2
Previous nomenclature and gene symbolization:
Semidwarf-b = sdw-b (3).
Inheritance:
Monofactorial recessive (3).
Located in chromosome 3HL (3); sdw2.b is over 34.5 cM distal from the sld1 (slender dwarf 1) locus (3). sdw2.b is associated with SNP markers 2_0650 to 2_0612 (positions 192.0 to 198.33 cM) in 3H bins 12 to 13 of the Bowman backcross-derived line BW829 (1).
Located in chromosome 3HL (3); sdw2.b is over 34.5 cM distal from the sld1 (slender dwarf 1) locus (3). sdw2.b is associated with SNP markers 2_0650 to 2_0612 (positions 192.0 to 198.33 cM) in 3H bins 12 to 13 of the Bowman backcross-derived line BW829 (1).
Description:
Plants are about 3/4 normal height; culms are thin with narrow, short, erect leaves. The flag leaf is narrow and short. The peduncle is short, the collar has a small leaf-like bract, and the basal rachis internode is elongated (3). Compared to Bowman, plants of the Bowman backcross-derived line for sdw2.b, BW829, were shorter 10 to 20% shorter, peduncles were 1/2 to 2/3 as long, rachis internodes were 10 to 20% shorter, and leaf blades were about 2/3 normal length and width. BW829 plants headed 1 to 3 days earlier than Bowman and they yielded about 2/3 as much. Kernels were shorter and thinner and weighed about 20% less, 4.6 vs 5.6 mg (2).
)
)
)
Origin of mutant:
A N-methyl-N-nitrosourea induced mutant in Mg4170 (3).
Mutational events:
sdw2.b (267MK, later called 437MK, GSHO 2466) in Mg4170 (3).
Mutant used for description and seed stocks:
sdw2.b (GSHO 2466) in Mg4170; sdw2.b in Bowman (PI 483237)*7 (GSHO 1965, BW829, NGB 22266).
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 Franckowiak, J.D. (Unpublished).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. Szarejko, I., and M. Maluszynski. 1984. Two new dwarfism genes on barley chromosome 3. Barley Genet. Newsl. 14:35-38.
2. Franckowiak, J.D. (Unpublished).
3. Szarejko, I., and M. Maluszynski. 1984. Two new dwarfism genes on barley chromosome 3. Barley Genet. Newsl. 14:35-38.
Prepared:
J.D. Franckowiak. 1997. Barley Genet. Newsl. 26:169.
Revised:
J.D. Franckowiak. 1997. Barley Genet. Newsl. 45:108.
