International Database for Barley Genes and Barley Genetic Stocks
BGS 718, Opposite spikelets 2, ops2
Stock number: BGS 718
Locus name: Opposite spikelets 2
Locus symbol: ops2
Previous nomenclature and gene symbolization:
Opposite spikelets-2 = op-2 (3, 4).
Inheritance:
Monofactorial recessive (4).
Location in chromosome 5HL (1); ops2.2 is associated with SNP markers 1_0217 to 1_0869 (positions 234.98 to 264.33 cM) in 5H bins 12 to 13 of the Bowman backcross-derived line BW640 (1).
Location in chromosome 5HL (1); ops2.2 is associated with SNP markers 1_0217 to 1_0869 (positions 234.98 to 264.33 cM) in 5H bins 12 to 13 of the Bowman backcross-derived line BW640 (1).
Description:
The ops2.2 plants have variable rachis internode lengths, which causes an irregular arrangement of spikelets in the spike (3, 4). Compared to Bowman, ops2.2 plants of the Bowman backcross-derived line, BW640, were about 2/3 normal height and had shorter peduncles, 2/3 to 3/4 of normal. Average rachis internode lengths were 4.1 vs. 4.8 cm for Bowman. The awns of BW640 were slightly shorter and kernels were 10% smaller and lighter. Grain yields of BW640 were 1/2 to 2/3 those of Bowman (2).
 spike with only slightly elongated rachis internodes to the left compared with normal Bowman.'))
Origin of mutant:
A gamma-ray induced mutant in Foma (NGB 14659, CIho 11333) (4).
Mutational events:
ops2.2 (NGB 115378, GSHO 2426) in Foma (NGB 14659, CIho 11333) (4).
Mutant used for description and seed stocks:
ops2.2 (NGB 115378, GSHO 2426) in Foma; ops2.2 in Bowman (PI 483237)*2 (GSHO 2317); ops2.2 in Bowman*5 (BW640, NGB 22205).
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 Franckowiak, J.D. (Unpublished).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. Gustafsson, Å., A. Hagberg, U. Lundqvist, and G. Persson. 1969. A proposed system of symbols for the collection of barley mutants at Svalöv. Hereditas 62:409-414.
4. Lundqvist, U. (Unpublished).
2. Franckowiak, J.D. (Unpublished).
3. Gustafsson, Å., A. Hagberg, U. Lundqvist, and G. Persson. 1969. A proposed system of symbols for the collection of barley mutants at Svalöv. Hereditas 62:409-414.
4. Lundqvist, U. (Unpublished).
Prepared:
U. Lundqvist and J.D. Franckowiak. 2013. Barley Genet. Newsl. 43:213.
