International Database for Barley Genes and Barley Genetic Stocks

BGS 27, Long basal rachis internode 3, lbi3

BGN  42:79
Stock number: BGS 27
Locus name: Long basal rachis internode 3
Locus symbol: lbi3

Previous nomenclature and gene symbolization:

Long basal rachis internode 3 = lb3 (1).


Monofactorial recessive (1).
Located in chromosome 7HL (3); lbi3.c is over 20.0 cM distal from the nud1 (naked caryopsis 1) locus (3); lbi3.c is associated with SNP markers 1_0534 to 2_0042 (positions 111.21 to 118.80) in 7H bin 07 of the Bowman backcross-derived line BW473 (1), in 7H bin 07.


Mutant plants in the cultivar Montcalm have a marked elongation and weakness of the basal rachis internode of the spike. This region may be 10 to 13 cm long in some tillers. The spike hangs vertically downward from the collar on emergence from the sheath and is often broken off in this region by the wind. When not broken off, spikes have normal fertility, contain well-filled grain, and show normal maturity (3). Expression of the lbi3.c allele in the Bowman-derived line is limited to a slight elongation of the basal rachis internode and a slightly lax spike.

Origin of mutant:

A gamma-ray induced mutant in Montcalm (CIho 7149) (3).

Mutational events:

lbi3.c (Alb Acc 291, GSHO 536), lbi3.d (Alb Acc 292), lbi3.e (Alb Acc 293), lbi3.m (Alb Acc 290) in Montcalm (CIho 7149) (3).

Mutant used for description and seed stocks:

lbi3.c (GSHO 536, Alb Acc 291) in Montcalm; lbi3.c in Bowman (PI 483237)*7 (GSHO 1840, BW473, NGB 20703).


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 Franckowiak, J.D. (Unpublished).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. Kasha, K.J., and G.W.R. Walker. 1960. Several recent barley mutants and their linkages. Can. J. Genet. Cytol. 2:397-415.


J.D. Franckowiak. 1997. Barley Genet. Newsl. 26:73.


J.D. Franckowiak. 2012. Barley Genet. Newsl. 42:79.