International Database for Barley Genes and Barley Genetic Stocks

BGS 679, Accordion rachis 4, acr4

BGN  47:181
Stock number: BGS 679
Locus name: Accordion rachis 4
Locus symbol: acr4

Previous nomenclature and gene symbolization:

Accordion rachis 3 = acr-3 (3).


Monofactorial recessive (2, 3).
Located in chromosome 2H or/and 6HL(1); acr4.3 is primarily associated with SNP markers 1_0891 to 2_1533 (positions 54.47 to 141.56 cM) in 2H bins 05 to 10 of the Bowman backcross-derived line BW004 and is associated with SNP markers 1_0015 to 2_0733 (positions 160.38 to 180.69 cM) in 6HL bins 10 to 11 of BW004 (1).


The acr4.3 mutant plants have multiple changes from normal besides elongated rachis internodes (3). Plant height is reduced, maturity is delayed, awns are short, the basal rachis internode is elongated, and partial fertility occurs (3). Plants of the Bowman backcross-derived line for acr4.3, BW004, showed similar alterations in plant morphology (2). The two largest DNA segments of BW004 in which donor parent SNP markers are retained overlap regions where lax spike loci have been mapped: 2HL (acr1, accordion rachis 1) and 6HL (lax-c, laxatum-c) (1, 2).

Origin of mutant:

An ethylene imine induced mutant in Bonus (NGB 14657, PI 189763) (3).

Mutational events:

acr4.3 (NGB 115043) in Bonus (NGB 14657, PI 189763) (2, 3).

Mutant used for description and seed stocks:

acr4.3 (NGB 115043) Bonus; acr4.3 in Bowman (PI 483237)*3 (BW004, NGB 20412).


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 Franckowiak, J.D. (Unpublished).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. Lundqvist, U. (Unpublished).


U. Lundqvist and J.D. Franckowiak. 2011. Barley Genet. Newsl. 41:201.


U. Lundqvist and J.D. Franckowiak. 2017. Barley Genet. Newsl. 47:181