BGS549

Stock number: BGS549
Locus name: Long glume awn
Locus symbol: Lga

Previous nomenclature and gene symbolization:

Long outer glume = Log (1). Helgason (1) used the gene symbol

log for the short glume awn type, but this symbol is also used for the

elongated outer glume (e) gene (4).
Inheritance:

Monofactorial dominant (1).

Location is unknown.
Description:

In spikelets of plants with the dominant allele (Lga1.a), the (outer)

glume length and width are unaltered, but the glume plus its awn is much longer

than the kernel. Heterozygotes have a glume awn of intermediate length. In

the short glume awn phenotype (lga1.b), the glume and its awn are about

the same length as the kernel. Tsuchiya (4) reported that the glume awn is 4

to 6 mm for the short type and 11 to 13 mm for the long type. Some recessive

alleles at the e locus (BGS057), which are high variable in glume size,

may have glumes phenotypical similar to those associated with the dominant

allele at the Lga locus. However, all e alleles have wider than

normal glumes and show a recessive inheritance pattern.
Origin of mutant:

The short glume awn appears to be the mutant phenotype and is present in many

two-rowed cultivars of Occidental origin.
Mutational events:

lga1.b in Canadian Thorpe (CI??) (2, 3).
Mutant used for description and seed stocks:

lga1.b in Bowman (PI 483237); Lga1.a from Akashinriki (OUJ, PI

467400) mutant OUM113 in Bowman*8 (BGS5701).
References:

1. Helgason, S.B. 1964. Inheritance of glume characteristics in some barley

crosses. p. 181-185. In S. Broekhuizen, G. Dantuma, H. Lamberts, and W.

Lange (eds.) Barley Genetics I. Proc. First Int. Barley Genet. Symp.,

Wageningen, 1963. Centre for Agricultural Publications and Documentation,

Wageningen.

2. Neatby, K.W. 1926. Inheritance of quantitative and other characters in a

barley cross. Sci. Agr. 7:77-84.

3. Neatby, K.W. 1929. An analysis of the inheritances of quantitative

characters and linkage in barley. Sci. Agr. 9:701-718.

4. Tsuchiya, T. 1974. Preliminary results on genetic studies of outer glume

characters in barley. BGN 4:76-78.
Prepared:

J.D. Franckowiak and U. Lundqvist. 1996. BGN 26: