International Database for Barley Genes and Barley Genetic Stocks

BGS 20, Reaction to barley yellow mosaic virus 2 (BaYMV), Rym2

BGN  26:66
Stock number: BGS 20
Locus name: Reaction to barley yellow mosaic virus 2 (BaYMV)
Locus symbol: Rym2

Previous nomenclature and gene symbolization:

Resistance to BaYMV 2 = Ym2 (4).


Monofactorial incomplete dominant (4).
Located in chromosome 7HL (4); Rym2.b is approximately 31.4 cM distal from the nud1 (naked caryopsis 1) locus (4).


Plants with Rym2.b allele have much less yellowing and stunting than susceptible plants when grown in fields that are infested with BaYMV (2). Also, Mihori Hadaka 3 is resistant to BaYMV, BaYMV-2, and BaMMV in Germany (1, 2).
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Origin of mutant:

Natural occurrence in Mihori Hadaka 3 (OUJ373, PI 467403) (4), and other cultivars of Oriental origin (2, 3).

Mutational events:

Rym2.b in Mihori Hadaka 3 (PI 467403) (4).

Mutant used for description and seed stocks:

Rym2.b in Mihori Hadaka 3 (OUJ373, PI 467403, GSHO 984).


1. Götz, R., and W. Friedt. 1993. Mode of inheritance and genetic diversity of BaMMV resistance of exotic barley germplasms carrying genes different from 'ym4'. Theor. Appl. Genet. 86:229-233.
2. Orden, F., and W. Friedt. 1993. Resistance to the barley yellow mosaic virus complex — Different genotypic reactions and genetics of BaMMV-resistance of barley (Hordeum vulgare L.). Plant Breed. 111:125-131.
3. Orden, F., R. Götz, and W. Friedt. 1993. Genetic stocks resistant to barley mosaic viruses (BaMMV, BaYMV, BaYMV-2) in Germany. Barley Genet. Newsl. 22:46-50.
4. Takahashi, R., I. Hayashi, T. Inouye, I. Moriya, and C. Hirao. 1973. Studies on resistance to yellow mosaic disease in barley. I. Tests for varietal reaction and genetic analysis of resistance to the disease. Ber. Ohara Inst. landw. Biol., Okayama Univ. 16:1-17.


R.G. Timian. 1976. Barley Genet. Newsl. 6:117.


T. Konishi and J.D. Franckowiak. 1997. Barley Genet. Newsl. 26:66.