International Database for Barley Genes and Barley Genetic Stocks

BGS 613, Branched 1, brc1

BGN  45:224
Stock number: BGS 613
Locus name: Branched 1
Locus symbol: brc1

Revised locus symbol:

The brc1.5 mutant is one of the alleles at the com2 (Compositum 2) locus (3). See BGS 071 for more information on the alleles at the com2 locus.

Previous nomenclature and gene symbolization:

Branched-5 = brc-5 (1, 2,3).


Monofactorial recessive (2).
Located in chromosome 2HS (2), brc1.5 is about 2.5 cM from AFLP marker E3636-2 and proximal from molecular marker CDO665A (2, 4); the BLASTn association of brh1.5 is with rice gene FUZZY PANICLE (FZP) (3, 4), in bin 2H bin 05.


A second-order ramification of the barley spike is observed in the brc1.5 mutant. The basal parts of the spike elongate to form rachis-like branches, and thus generating a ramified spike phenotype (1, 2). The brc1.5 (com2) mutant disrupts production of COM2 containing an AP2/ERF (an ethylene-responsive element DNA binding factor) domain that represses inflorescence branch formation (3).

Origin of mutant:

Natural occurrence in line BGRC 13145 from the Braunschweig seed collection (Hordeum vulgare L. convar. distichon (L.) Alef. var. inerme Körn.) (5).

Mutational events:

brc1.5 (G22, SG-H3/5/8-88 from Köln) in BGRC 13145 of Braunschweig seed collection (2, 5).

Mutant used for description and seed stocks:

brc1.5 (G22) in BGRC 13145; brc1.5 in Bowman (PI 483237)*2 (BW071, NGB 20408).


1. Bossinger, G., U. Lundqvist, W. Rohde, and F. Salamini. 1992. Genetics of plant development in barley. p. 989-1017. In L. Munck, K. Kirkegaard, and B. Jensen (eds.). Barley Genetics VI. Proc. Sixth Int. Barley Genet. Symp., Helsingborg, 1991. Munksgaard Int. Publ., Copenhagen.

2. Castiglioni, P., C. Pozzi, M. Heun, V. Terzi, K.J. Müller, W. Rohde, and F. Salamini. 1998. An AFLP-based procedure for the efficient mapping of mutations and DNA probes in barley. Genetics 149:2039-2056.

3. Poursarebani, N., T. Seidensticker, R. Koppolu, C. Trautewig, P. Gawroński, F. Bini, G. Govind, T. Rutten, S. Sakuma, A. Tagiri, G.M. Wolde, H. M. Youssef, A. Battal, S. Ciannamea, T. Fusca, T. Nussbaumer, C. Pozzi, A. Börner, U. Lundqvist, T. Komatsuda, S. Salvi, R. Tuberosa, C. Uauy, N. Sreenivasulu, L. Rossini, and T. Schnurbusch. The genetic basis of composite spike form in barley and ‘Miracle-Wheat’. Genetics 201:155-165.

4. Rossini, L., A. Vecchietti, L. Nicoloso, N. Stein, S. Franzago, F. Salamini, and C. Pozzi. 2006. Candidate genes for barley mutants involved in plant architecture: an in silico approach. Theor. Appl. Genet. 112:1073-1085.

5. Salamini, F. (Personal communications).


J.D. Franckowiak and U. Lundqvist. 2002. Barley Genet. Newsl. 32:114.
J.D. Franckowiak and U. Lundqvist. 2015. Barley Genet. Newsl. 45:224-225.