International Database for Barley Genes and Barley Genetic Stocks

BGS 101, Absent lower laterals 1, als1

BGN  43:74
Stock number: BGS 101
Locus name: Absent lower laterals 1
Locus symbol: als1

Previous nomenclature and gene symbolization:

Absent lower laterals = als (6).


Monofactorial recessive (6).
Located in chromosome 3HL (6, 7. 9.10); als1.a is about 31.2 cM distal from the uzu1 (uzu 1) locus (7), als1.a is about 39.7 cM proximal from the cur2 (curly 2) locus (6); als1.a is near AFLP marker E4234-11 in subgroup 28 of the Proctor/Nudinka map (8); als1.a in BW012 is about 4.6 cM proximal from RFLP marker KFP128 (1); als1.a in BW012 is about 16.7 cM proximal of SSR marker GBM1050 (3); als1.a is associated with SNP markers 2_0628 to 2_0650 (positions 151.97 to 192.0 cM) in 3H bins 10 to 12 of the Bowman backcross-derived line BW012 (4), in 3H bin11 (3).


Lateral spikelets at the base of the spike fail to develop or are partially developed. Tillers are large, coarse, and stiff, and only 1 or 2 tillers are produced in the six-rowed stock (6). The als1.a plants resemble those produced by the uniculm 2 (cul2) mutant (6). Plants of the Bowman backcross-derived line commonly produce 3 to 4 tillers with short, malformed spikes (irregular placement of central and lateral spikelets); and seed yields are very low (1, 2). The als1.a plants produced primary tillers, but secondary tillers were not formed (2). Other morphological differences between BW012 and Bowman included longer awns, 17 vs. 12 cm, and 3 to 5 more kernels per spike. Kernels were slightly longer and wider, but kernel weights were about 10% lighter (5).

Origin of mutant:

A gamma-ray induced mutant in Montcalm (CIho 7149) (6).

Mutational events:

als1.a (Alb Acc 281, GSHO 1065) in Montcalm (CIho 7149) (6).

Mutant used for description and seed stocks:

als1.a (GSHO 1065) in Montcalm; als1.a in Bowman (PI 483237)*7 (GSHO 1990, BW012, NGB 20420).


1. Babb, S., and G.J. Muehlbauer. 2003. Genetic and morphological characterization of the barley uniculm 2 (cul2) mutant. Theor. Appl. Genet. 106:846-857.
2. Dabbert, T., R.J. Okagaki, S. Cho, J. Boddu, and G.J. Muehlbauer. 2009. The genetics of barley low-tillering mutants: absent lower laterals (als). Theor. Appl. Genet. 118:1351-1360.
3. Dabbert, T., R.J. Okagaki, S. Cho, S. Heinen, J. Boddu, and G.J. Muehlbauer. 2010. The genetics of barley low-tillering mutants: low number of tillers-1 (lnt1) Theor. Appl. Genet. 121:705-715.
4. 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.
5. Franckowiak, J.D. (Unpublished).
6. Kasha, K.J., and G.W.R. Walker. 1960. Several recent barley mutants and their linkages. Can. J. Genet. Cytol. 2:397-415.
7. Konishi, T., J. Hayashi, I. Moriya, and R. Takahashi. 1984. Inheritance and linkage studies in barley. VII. Location of six new mutant genes on chromosome 3. Ber. Ohara Inst. landw. Biol., Okayama Univ. 18:251-264.
8. 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.
9. Shahla, A., and T. Tsuchiya. 1983. Telotrisomic analysis in Triplo 3S in barley. Barley Genet. Newsl. 13:25.
10. Singh, R.J., and T. Tsuchiya. 1974. Further information on telotrisomic analysis in barley. Barley Genet. Newsl. 4:66-69.


T. Tsuchiya and T.E. Haus. 1971. Barley Genet. Newsl. 1:123.


J.D. Franckowiak. 1997. Barley Genet. Newsl. 26:135.
J.D. Franckowiak. 2007. Barley Genet. Newsl. 37:219.
J.D. Franckowiak. 2013. Barley Genet. Newsl. 43:74-75.