International Database for Barley Genes and Barley Genetic Stocks

BGS 661, Double seed 1, dub1

BGN  48:172
Stock number: BGS 661
Locus name: Double seed 1
Locus symbol: dub1

Previous nomenclature and gene symbolization:



Monofactorial recessive (2).
Located in chromosome 5HL (2); dub1.1 is near AFLP marker E4038-4 in subgroups 66 to 67 of the Proctor/Nudinka map of chromosome 5H (2), dub1.1 is slightly distal from the mnd6 (many noded dwarf 6) locus (2), which is in 5H bin 10. (2).


The modification of the top of spike is distinctive and occurs on all tillers. The tip of the spike is compacted and a few spikelets form two and three fertile florets adjacent to each other. The double spikelets have fused lemmas and paleas often enclose the part of two, and occasionally more, florets: six anthers and two ovaries (1). The tip of the spike appears phenotypically similar to those of int-m (intermedium spike-m) mutants (1).

Origin of mutant:

An X-ray and ferrisulfate induced mutant in Bonus (NGB 14657, PI 189763) (1).

Mutational events:

dub1.1 (NGB 114331), dub1.2 (NGB 114332) in Bonus (NGB 14657, PI 189763) (1); dub1.3 (NGB 114333), dub1.7 (NGB 114337), dub1.8 (NGB 114338), dub1.9 (NGB 114339), dub1.10 (NGB114340), dub1.11 (NGB 114341), dub1.12 (NGB 114342) in Foma (NGB 14659, CIho 11333) (1); dub1.18a (NGB 114345), dub1.18b (NGB 114347) in Kristina (NGB 14661, NGB 1500) (1); dub1.19 (NGB 114348), dub1.20 (NGB 61114350) in Bonus (1).

Mutant used for description and seed stocks:

dub1.1 (NGB 114331) in Bonus (2).


1. Lundqvist, U. (Unpublished).
2. Pozzi, C., D. di Pietro, G. Halas, C. Roig, and F. Salamini. 2003. Integration of a barley (Hordeum vulgare) molecular linkage map with the position of genetic loci hosting 29 developmental mutants. Heredity 90:390-396.


U. Lundqvist and J.D. Franckowiak. 2007. Barley Genet. Newsl. 37:301.


U. Lundqvist and J.D. Franckowiak. 2018. Barley Genet. Newsl. 48:172.