International Database for Barley Genes and Barley Genetic Stocks

BGS 160, Enhancer of minute, min2

BGN  26:186
Stock number: BGS 160
Locus name: Enhancer of minute
Locus symbol: min2

Previous nomenclature and gene symbolization:

Enhancer of minute = en-min


Monofactorial recessive, but expressed only in plants homozygous for the min1.a (semi-minute dwarf 1) allele (3).
Location is unknown.


Plants are extremely dwarfed with the adult plant being less than 5 cm tall. The leaf blade and sheath are very short and thick and have a whitish dark green color. Roots are thick and short with C-tumor-like swelling at their tips. No spikes are formed; hence, the stock must be maintained as a heterozygote at the min1 locus (2). Among the kernels produced by heterozygous plants, those that will give rise to minute plants have a markedly shrunken endosperm (1, 2). Tissues of the plant are mixoploid with 2x, 3x, 4x, and up to 60x cells being formed by abnormal cytokinesis (1, 2).
No images

Origin of mutant:

A spontaneous mutant at the min1 locus in Kaiyo Bozu (OUJ378, PI 467405) permits expression of en-min (2).

Mutational events:

Natural occurrence of en-min (OUL921, GSHO 266) in Kaiyo Bozu (OUJ378, PI 467405) (2).

Mutant used for description and seed stocks:

en-min in a line of Kaiyo Bozu (GSHO 266) that is heterozygous at the min1 locus.


1. Morikawa, T., and E. Gomi. 1996. Pleiotropism of minute gene (min) of barley. p. 530-532. 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.
2. Takahashi, R., A. Mochizuki, and J. Hayashi. 1955. [Heritable mixoploidy in barley.] Nogaku Kenkyu 43:51-62. [In Japanese.]
3. Takahashi, R., A. Mochizuki, and J. Hayashi. 1959. Heritable mixoploidy in barley. II. On the semi-minute. Nogaku Kenkyu 47:95-104. [In Japanese with English summary.]


R. Takahashi. 1972. Barley Genet. Newsl. 2:185.


T. Konishi and J.D. Franckowiak. 1997. Barley Genet. Newsl. 26:186.