BGS 163, Spring growth habit 1, sgh1

Light sensitiveness = ls (2).
Spring habit of growth 1 = sh1 (3).

Monofactorial recessive (2).
Located in chromosome 4HL (2); sgh1.a is about 5.1 cM distal from the Hsh1 (Hairy leaf sheath 1) locus (1, 4).

The sgh1.a allele conditions a highly spring habit (grade I) and plants readily form ear primordia under long-day conditions without prior cold treatment. However, the type cultivar, Iwate Mensury C, and some other cultivars, which are homozygous for the sgh1.a allele, behave as a winter type when sown in the fall (short-day condition) (2, 3, 6). When near-isogenic lines for growth habit are grown at Kurashiki, Japan, the sgh1.a allele has little influence on maturity or phenotype in the presence of the other spring habit of growth genes (7). Cultivars having only the sgh1.a allele for spring habit are rare (5, 6). The sgh1.a allele is found rarely in spring barley cultivars from Tibet (8).

Natural occurrence in many cultivars (3, 5).

sgh1.a in many cultivars in the so-called Occidental region, and in most cases sgh1.a is accompanied by the dominant allele at the Sgh2 (Spring growth habit 2) locus (5).

sgh1.a in Iwate Mensury C (OUJ308, GSHO 575); sgh1.a in Hayakiso 2 (OUJ064)*11 (7); sgh1.a in Dairokkaku 1 (OUJ654)*11 (7).

1. Takahashi, R., J. Hayashi, and S. Yasuda. 1957. [Four genes in linkage in barley, which are inherited independently of the markers in the known seven linkage groups in barley.] Nogaku Kenkyu 45:1-10. [In Japanese.]
2. Takahashi, R., and J. Yamamoto. 1951. [Physiology and genetics of ear emergence in barley and wheat. I. The inheritance and linkage of "light sensitiveness" in barley.] Nogaku Kenkyu 40:13-24. [In Japanese.]
3. 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.
4. Takahashi, R., S. Yasuda, J. Yamamoto, and I. Shiojiri. 1953. [Physiology and genetics of ear emergence in barley and wheat. II. Genic analysis of growth-habit in two spring barleys.] Nogaku Kenkyu 40:157-168. [In Japanese.]
5. 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.
6. Yasuda, S. 1969. [Physiology and genetics of ear emergence in barley and wheat. VIII. Effects of four genes for spring habit on earliness in barley.] Nogaku Kenkyu 53:99-113. [In Japanese.]
7. 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.
8. Yasuda, S., J. Hayashi, and I. Moriya. 1986. Genotype differentiation in spring growth habit of barley strains collected from northern parts of Pakistan and India. Barley Genet. Newsl. 16:18-19.

S. Yasuda. 1972. Barley Genet. Newsl. 2:188.

T. Konishi and J.D. Franckowiak. 1997. Barley Genet. Newsl. 26:188.