International Database for Barley Genes and Barley Genetic Stocks
BGS 545, Intermedium spike-i, int-i
Stock number: BGS 545
Locus name: Intermedium spike-i
Locus symbol: int-i
Previous nomenclature and gene symbolization:
Monofactorial recessive (3).
Location is chromosome 2HS (1); int-i.39 is associated with SNP markers 1_1110 to 2_1304 (positions to 34.31 to 58.56 cM) in 2H bins 04 and 05 of the Bowman backcross-derived line BW426) (1), likely in 2H bin 04 or 05.
Lateral spikelets are enlarged and slightly pointed at the apex, but they fail to set seed. The tip of the spike may have very short rachis internodes and appears very dense or fasciated (4). Plants of the Bowman backcross-derived line BW426 exhibited elongation of the basal rachis internode. BW426 plants were about 3/4 the height of Bowman plants and the spikes had slightly long rachis internodes. Although kernels per spike and seed weights were variable over nurseries, BW426 plants had In general fewer kernels/spike and kernel weights were 10 to15% below those of Bowman. Grain yields of BW426 were 1/2 to 3/4 of normal (2).
Origin of mutant:
An ethylene imine induced mutant in Kristina (NGB 14661, NGB 1500) (4).
int-i.39 (NGB 115457, GSHO 1769) in Kristina (NGB 14661, NGB 1500) (3, 4).
Mutant used for description and seed stocks:
int-i.39 (GSHO 1769, NGB 115457) in Kristina; int-i.39 in Bowman (PI 483237)*4 (GSHO 2272); int-i.39 in Bowman*6 (BW426, NGB 20659).
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 Franckowiak, J.D. (Unpublished).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., and U. Lundqvist. 1980. Hexastichon and intermedium mutants in barley. Hereditas 92:229-236.
4. Lundqvist, U., and A. Lundqvist. 1988. Induced intermedium mutants in barley: origin, morphology and inheritance. Hereditas 108:13-26.
U. Lundqvist and J.D. Franckowiak. 1997. Barley Genet. Newsl. 26:471.
J.D. Franckowiak and U. Lundqvist. 2011. Barley Genet. Newsl. 41:181.