International Database for Barley Genes and Barley Genetic Stocks

BGS 718, Opposite spikelets 2, ops2

BGN  43:213
Stock number: BGS 718
Locus name: Opposite spikelets 2
Locus symbol: ops2

Previous nomenclature and gene symbolization:

Opposite spikelets-2 = op-2 (3, 4).


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).


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).

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).


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 Franckowiak, J.D. (Unpublished).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 Lundqvist, U. (Unpublished).


U. Lundqvist and J.D. Franckowiak. 2013. Barley Genet. Newsl. 43:213.