International Database for Barley Genes and Barley Genetic Stocks

BGS 227, Small lateral spikelet 1, sls1

BGN  48:111
Stock number: BGS 227
Locus name: Small lateral spikelet 1
Locus symbol: sls1

Previous nomenclature and gene symbolization:



Monofactorial recessive (3).
Located in chromosome 1HL (3); sls1.a is closely linked to the msg1 (male sterile genetic 1) locus (3); sls1.a is associated with SNP markers 1_0933 to 3_0343 (positions 82.35 to 87.19 cM) in 1H bin 08 of the Bowman backcross-derived line BW867 (1), at about 314 Mb.


Sterile lateral spikelets become progressively smaller toward the tip of two-rowed spikes in plants, which express the Vrs1.b and int-c.b alleles at the six-rowed spike 1 and intermedium spike-c loci, respectively. The terminal rachis internodes generally have rudimentary lateral spikelets. Expression of the sls1 is affected by genetic background, but express is often stronger in late tillers. The trait can be observed only in some two-rowed segregates from crosses between six- and two-rowed cultivars. No significant differences in agronomic traits were observed between Boman backcross-derived line sls1.a (BW867) and Bowman, but kernels tended to be wider and heavier and test weights are slightly higher (2).

Origin of mutant:

Natural occurrence in six-rowed cultivars derived from Manchurian introductions, but it cannot be observed visually in six-rowed barley cultivars with the six-rowed or deficiens spike traits (vrs1.a and Vrs1.t, respectively) (2)..

Mutational events:

sls1.a in MSS005 [ from CIho 5368 in Betzes (PI 129430)*11 (GSHO 1810)]; sls1.a in Morex (CIho 15773, GSHO 2492); molecular markers associated with the presence of the sls1.a allele occur frequently in six-rowed spring barleys of Manchurian

Mutant used for description and seed stocks:

sls1.a in Morex (GSHO 2492); sls1.a from MSS005 in Bowman (PI 483237, NGB 22812 )*8 (GSHO 2034, BW867, NGB 22304).


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 Franckowiak, J.D. (Unpublished).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. Franckowiak, J.D. 1995. Notes on linkage drag in Bowman backcross derived lines of spring barley. Barley Genet. Newsl. 24:63-70.


J.D. Franckowiak. 1997. Barley Genet. Newsl. 26:225.


J.D. Franckowiak. 2010. Barley Genet. Newsl. 40:78.
J.D. Franckowiak. 2018. Barley Genet. Newsl. 48:111.