International Database for Barley Genes and Barley Genetic Stocks
BGS 309, Spring growth habit 2, Sgh2
Stock number: BGS 309
Locus name: Spring growth habit 2
Locus symbol: Sgh2
Previous nomenclature and gene symbolization:
Spring habit of growth 2 = Sh2 (4).
Inheritance:
Monofactorial dominant (1), but a multiple allelic series exists with the alleles for the highest grade of spring habit dominant over those for less spring-like habit. The dominant alleles are epistatic to the winter habit alleles at the sgh1 and Sgh3 loci (1, 2, 3).
Located in chromosome 5HL (1, 2); Sgh2.I is over 15.1 cM distal from the raw1 (smooth awn 1) locus (1, 2).
Description:
When grown under long-day conditions in the greenhouse, plants with the Sgh2.I gene for spring habit (grade I type) head in about 40 days. Plants with the Sgh2.II gene (grade II type) are 10 days or more later than those with Sgh2.I, and require about 10 days of pre-chilling to make up the difference in heading time (2). Complex interactions with genotype and other spring growth habits are reported (5). The Sgh2.II allele is prevalent in the Oriental region, while the Sgh2.I allele is confined to the Occidental region (1, 2).
No images
Origin of mutant:
Natural occurrence in most spring types of barley (3).
Mutational events:
Sgh2.I or Sgh2.II are present in many spring barley cultivars and probably some wild progenitors (2).
Mutant used for description and seed stocks:
Sgh2.I in Indian Barley (OUJ694, GSHO 770); Sgh2.II in Marumi 16 (OUJ007, GSHO 767).
References:
1. Takahashi, R., and S. Yasuda. 1956. Genetic studies of spring and winter habit of growth habit in barley. Ber. Ohara Inst. landw. Biol., Okayama Univ. 10:245-308.
2. Takahashi, R., and S. Yasuda. 1971. Genetics of earliness and growth habit in barley. p. 388-408. In R.A. Nilan (ed.) Barley Genetics II. Proc. Second Int. Barley Genet. Symp., Pullman, WA, 1969. Washington State Univ. Press, Pullman.
3. Takahashi, R., S. Yasuda, J. Hayashi, T. Fukuyama, I. Moriya, and T. Konishi. 1983. Catalogue of barley germplasm preserved in Okayama University. Inst. Agric. Biol. Sci., Okayama Univ., Kurashiki, Japan. 217 p.
4. Takahashi, R., S. Yasuda, J. Hayashi, and I. Shiojiri. 1954. [Physiology and genetics of ear emergence in wheat and barley. III. Genetic studies on the spring habit of growth with various barley varieties.] Nogaku Kenkyu 41:87-96. [In Japanese.]
5. Yasuda, S. 1981. Comparison of yield and some yield components among strains with different genetic combinations of spring genes in barley. Barley Genet. Newsl. 11:38-40.
Prepared:
S. Yasuda. 1972. Barley Genet. Newsl. 2:199.
Revised:
J.D. Franckowiak and T. Konishi. 1997. Barley Genet. Newsl. 26:259.
