International Database for Barley Genes and Barley Genetic Stocks
BGS 182, Extra floret-a, flo-a
Stock number: BGS 182
Locus name: Extra floret-a
Locus symbol: flo-a
Previous nomenclature and gene symbolization:
Monofactorial recessive (3, 4).
Location in chromosome 6HL (1); flo-a.1 is associated with SNP markers 1_0539 to 1_0040 (positions 76.05 to 107.26 cM) in 6H bins 06 to 07 of the Bowman backcross-derived line BW367 (1); flo-a.3 is associated with SNP markers 2_0746 to 1_1246 (positions 125.86 to 134.55 cM) in 6H bin 08 of the Bowman backcross-derived line BW368 (1); flo-a.5 is associated with SNP markers 1_0061 to 1_1246 (positions 70.15 to 134.55 cM) in 6H bins 05 to 08 of the Bowman backcross-derived line BW369 (1), likely in 6H bin 07.
Extra floral bracts develop occasionally at the base of the central spikelet on the abaxial side. Formation of the extra floral bracts is most common in the central portion of the spike, but rarely will the floral bracts form another spikelet (2, 4). Except for the occasional development of a floral bract below the central spikelet, the Bowman backcross-derived lines for mutants at the flo-a locus, BW367, BW368, and BW369 were similar to Bowman (2).
Origin of mutant:
An ethylene imine induced mutant in Foma (NGB 14659, CIho 11333) (4).
flo-a.1 (NGB 114271, GSHO 1741) in Foma (NGB 14659, CIho 11333) (4); flo-a.3 (NGB 114273, GSHO 1742), previously named flo-b.3 in Foma; flo-a.5 (NGB 114275, GSHO 1743), previously named flo-c.5 in Foma (4).
Mutant used for description and seed stocks:
flo-a.1 (NGB 114271, GSHO 1741 ) in Foma, flo-a.3 (NGB 114273, GSHO 1742) in Foma; flo-a.5 (NGB 114275, GSHO 1743) in Foma; flo-a.1 in Bowman (PI 483237)*5 (GSHO 2005), in Bowman*7 (BW367, NGB 20606); flo-a.3 in Bowman (PI 483237)*6 (GSHO 2128, BW368, NGB 20607); flo-a.5 in Bowman (PI 483237)*7 (GSHO 1877, NGB 114275, BW369, NGB 20608).
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 Franckowiak, J.D. (Unpublished).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. Gustafsson, Å., A. Hagberg, U. Lundqvist, and G. Persson. 1969. A proposed system of symbols for the collection of barley mutants at Svalöv. Hereditas 62:409-414.
4. Lundqvist, U. (Unpublished).
U. Lundqvist and J.D. Franckowiak. 1997. Barley Genet. Newsl. 26:205.
J.D. Franckowiak and U. Lundqvist. 2011. Barley Genet. Newsl. 41:112.
U. Lundqvist and J.D. Franckowiak. 2015. Barley Genet. Newsl. 45:116.