International Database for Barley Genes and Barley Genetic Stocks

BGS 642, NADH nitrate reductase-deficient 6 (molybdenum cofactor), nar6

BGN  35:199
Stock number: BGS 642
Locus name: NADH nitrate reductase-deficient 6 (molybdenum cofactor)
Locus symbol: nar6

Previous nomenclature and gene symbolization:



Monofactorial recessive (3).
Location in chromosome 2HL (1), nar6.v is co-segregating with nar4 (NADH nitrate reductase-deficient 4 (molybdenum cofactor) and Gln2 (Glutamine synthetase 2) in 2H bin 13 (1).


The nar6 mutant is characterized by a pleiotropic loss of nitrate reductase and xanthine dehydrogenase activity (3). Homozygotes are not viable and the nar6 gene must be maintained as a heterozygote (2).
No images

Origin of mutant:

A sodium azide induced mutant in Steptoe (CIho 15229) (2).

Mutational events:

nar6.v (Az69) in Steptoe (CIho 15229) (2).

Mutant used for description and seed stocks:

nar6.v (Az69) in Steptoe.


1. Kleinhofs, A. 1997. Integrated barley RFLP and classical marker maps. Barley Genet. Newsl. 27:105-112.

2. Kleinhofs, A. (Unpublished).

3. Kleinhofs, A., A. Killian, M.A. Saghai Maroof, R.M. Biyashev, P. Hayes, F.Q. Chen, N. Lapitan, A. Fenwick, T.K. Blake, V. Kanazin, L. Dahleen, D. Kudrna, J. Bollinger, S.J. Knapp, B. Liu, M. Sorrells, M. Heun, J.D. Franckowiak, D. Hoffman, R. Skadsen, and B.J. Steffenson. 1993. A molecular, isozyme and morphological map of the barley (Hordeum vulgare) genome. Theor. Appl. Genet. 86:705-712.


A. Kleinhofs. 2005. Barley Genet. Newsl. 35:200.