International Database for Barley Genes and Barley Genetic Stocks
BGS 612, Gigas 2, gig2
Stock number: BGS 612
Locus name: Gigas 2
Locus symbol: gig2
Previous nomenclature and gene symbolization:
Monofactorial recessive (2, 3).
Location in chromosome 4HL (1); gig2.c is associated with SNP marker 3_0554 (position 102.93 cM) in 4H bin 07 of the Bowman backcross-derived line BW382 (1), in 4H bin 07.
Plants with the gig2 gene are tall and robust. Most plant parts are larger than those of normal sibs and spikes have 4 to 8 more fertile spikelets. In the greenhouse, heading is delayed by two to three weeks and plants are nearly twice as tall as normal sibs. Under field conditions, plants are tall and late and lodge easily. If planted late in North Dakota, gig2.c plants may remain vegetative until the end of the growing season (2). Compared to Bowman, the Bowman backcross-derived line for gig2.c, BW382, headed 14 days later at Aberdeen, Idaho and 27 days later at Dundee, Scotland. Upper leaf blades of BW382 were 25 to 50% wider and plants were taller, 107 vs. 88 cm. The awns were slightly shorter and spikes had 2 to 9 more kernels at various locations. Kernels of BW382 were shorter (8.7 vs. 9.4 mm) and narrower (3.43 vs. 3.86 mm) and lighter (47 vs.59 mg). Test weights of BW382 were about 25% lower and grain yields 25 to 50% lower than those for Bowman (2). Based on a similar phenotype and retained SNP markers in 4HL, BW380 contains an allele at the gig2 locus, tentatively named gig2.e (1, 2).
Origin of mutant:
A spontaneous mutant in the breeding line ND12463 (ND7556/4/ND5835// ND4064/ND2199/3/Bowman/5/ND8879) (2).
gig2.c in ND12463 (GSHO 1750, DWS1372) (3), gig2.e in ND18365 (2B91-4947/ND15403) (2).
Mutant used for description and seed stocks:
gig2.c in ND12463 (GSHO 1750); gig2.c in Bowman (PI 483237)*6 (GSHO 2266); gig2.c in Bowman*8 (BW382, NGB 20621); gig2.e in Bowman*2 (BW380, NGB 20619).
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 Franckowiak, J.D. (Unpublished).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. Franckowiak, J.D., and A. Pecio. 1992. Coordinator’s report: Semidwarf genes. A listing of genetic stocks. Barley Genet. Newsl. 21:116-127.
J.D. Franckowiak. 2002. Barley Genet. Newsl. 32:113.
J.D. Franckowiak. 2014. Barley Genet. Newsl. 44:191.