International Database for Barley Genes and Barley Genetic Stocks
BGS 240, Semidwarf 6, sdw6
Stock number: BGS 240
Locus name: Semidwarf 6
Locus symbol: sdw6
Previous nomenclature and gene symbolization:
Semidwarf f = sdw.f (2).
Monofactorial recessive (4).
The location is limited to chromosomes 1H or 7H based on SNP markers retained in the Bowman backcross-derived line BW806, between 1_0764 to 1_0075 (positions 61.55 to 82.35 cM) in 1H and between 2_1270 and 1_1219 (positions 93.97 to 107.44 cM) in 7H (1).
Plants with the sdw6.f gene are 10 to 20% shorter than normal sibs in the Bowman backcross-derived line BW806. Kernels were slightly shorter and were 10 to 20% lighter. The number of kernels per spike was slightly reduced. Grain yields were about 3/4 of normal and test weights were slightly lower. Based on the heterogeneous marker positions in line BW806, sdw6.f is not an allele at any of the previously named semidwarf loci (1, 2).
Origin of mutant:
An ethyl methanesulfonate induced mutant in Vada (PI 243182) isolated as Betina (PI 362200) by Institute de la Recherche Agronomique, Versailles, Yvelines, France; released as a cultivar in 1970 (3, 4).
sdw6.f [GSHO 2449, Betina (PI 362200)] in Vada (PI 241382) (3).
Mutant used for description and seed stocks:
sdw6.f (GSHO 2449, PI 362200) in Vada; sdw6.f in Bowman (PI 483237)*4 (GSHO 2331), sdw6.f in Bowman*5 (BW806, NGB 20783).
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 Franckowiak, J.D. (Unpublished).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. Sigurbjörnsson, B., and A. Micke. 1974. Philosophy and accomplishments of mutation breeding. pp. 303-343. In Polyploidy and Induced Mutations in Plant Breeding. IAEA, Vienna.
4. USDA, GRIN. http://www.ars-grin.gov/cgi-bin/npgs/acc/display.pl?1270981.
J.D. Franckowiak. 2010. Barley Genet. Newsl. 40:84.
J.D. Franckowiak. 2016. Barley Genet. Newsl. 46:77.