International Database for Barley Genes and Barley Genetic Stocks

BGS 719, Opposite spikelets 3, ops3

BGN  43:214
Stock number: BGS 719
Locus name: Opposite spikelets 3
Locus symbol: ops3

Previous nomenclature and gene symbolization:

Opposite spikelets-1 = op-1 (3, 4).


Monofactorial recessive (4).
Location in chromosome 5HS (1); ops3.1 is associated with SNP markers 1_1048 to 1_0688 (positions 46.35 to 52.12 cM) in 5H bin 03 and with SNP markers 2_0722 and 2_0495 (positions 23.45 and 32.35 cM) in 7H bin 02 of the Bowman backcross-derived line BW639 (1), likely in 5H bin 03.


The opposite spike like arrangement of spikelets in the spike of ops3.1 plants is caused variable rachis internode lengths (3, 4). Compared to normal sibs, plants of the Bowman backcross-derived line for ops3.1, BW639, were slightly later and taller and had slightly longer peduncles (2). Plants of the BW639 had 2 to 4 more kernels per spike and yielded about 3/4 as much grain as Bowman plants (2).

Origin of mutant:

An ethylene imine induced mutant in Bonus (NGB 14657, PI 189763) (4).

Mutational events:

ops3.1 (NGB 115377, GSHO 2425) in Bonus (NGB 14657, PI 189763) (4).

Mutant used for description and seed stocks:

ops3.1 (NGB 115377, GSHO 2425) in Bonus; ops3.1 in Bowman (PI 483237)*2 (GSHO 2316); ops3.1in Bowman*5 (BW639, NGB 22204).


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 Franckowiak, J.D. (Unpublished).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 Lundqvist, U. (Unpublished).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. 43:214.