Börner (1996) found only one plant height mutant in barley that showed no response to treatment of seedlings with gibberellic acid (GA₃). The GA insensitive mutant `Hv287' has a semidwarf phenotype and was isolated by Farvet et al. (1975). Many of the other semidwarf mutants were less responsive to GA than their parental cultivars, but increased elongation occurred after GA application. Börner and Korzun (1996) reported that both the GA insensitive semidwarf gene and a GA sensitive lethal dwarf gene from `Hv288' are located in chromosome 2 near the vrs1 (six-rowed spike 1) locus.

Pakniyat et al. (1996) demonstrated that mutants at the ari-e (breviaristatum-e) locus are associated with reduced Na⁺ accumulation or salt tolerance and reduced sensitivity to GA₃ treatment. The gene symbol ari-e.GP was suggested for the Golden Promise mutant.

Dofing (1996) studied the effects of the uniculm (cul2.b, formerly uc2) gene on performance of six-rowed barley at Palmer, Alaska, U.S.A. Near-isogenic uniculm lines had larger kernels, but grain yields were much less at all seedling rates than those of normal lines.

Three plant height mutants, MC166, MC169, and MC170, from a two-rowed line carrying the T6-7a translocation, were shown to increase spike internode length and alter seed shape and weight (Prina et al., 1995).

References:

Börner, A. 1996. GA response in semidwarf barley. BGN 25:24-26.

Börner, A., and V. Korzun. 1996. Genetical studies of two barley mutants differing in their GA response. BGN 25:27-29.

Dofing, S.M. 1996. Near-isogenic analysis of uniculm and conventional-tillering barley lines. p. 617-619. In A.E. Slinkard, G.J. Scoles, and B.G. Rossnagel (eds.) Proc. Fifth Int. Oat Conf. & Seventh Int. Barley Genet. Symp., Saskatoon. Univ. of Saskatchewan, Saskatoon.

Favret, E.A., G.C. Favret, and E.M. Malvarez. 1975. Genetic regulatory mechanisms for seedling growth in barley. p. 37-42. In H. Gaul (ed.) Barley Genetics III. Proc. Third Int. Barley Genet. Symp., Garching, 1975. Verlag Karl Thiemig, München.

Pakniyat, H., E. Baird, W.T.B. Thomas, P.D.S. Caligari, W. Powell, and B.P. Forster. 1996. Effect of semi-dwarf mutants on salt tolerance in barley. p. 660-661. In A.E. Slinkard, G.J. Scoles, and B.G. Rossnagel (eds.) Proc. Fifth Int. Oat Conf. & Seventh Int. Barley Genet. Symp., Saskatoon. Univ. of Saskatchewan, Saskatoon.

Prina, A.R., and M. del C. Arias. 1995. Grain and spike morphology in three pleiotropic barley mutants and their homozygous double combinations. BGN 24:75-79.