International Database for Barley Genes and Barley Genetic Stocks

BGS 641, NADH nitrate reductase-deficient 5 (molybdenum cofactor), nar5

BGN  35:198
Stock number: BGS 641
Locus name: NADH nitrate reductase-deficient 5 (molybdenum cofactor)
Locus symbol: nar5

Previous nomenclature and gene symbolization:



Monofactorial recessive (3).
Location in chromosome 5HL (1); nar5.o is near molecular marker ABC324 in bin 5H-06 (1).


The nar5 mutants are characterized by a pleiotropic loss of nitrate reductase and xanthine dehydrogenase activity (3). All alleles are somewhat light green and viable as homozygotes (1).
No images

Origin of mutant:

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

Mutational events:

nar5.o (Az62), nar5.s (Az66), nar5.u (Az68, GSHO 2417) in Steptoe (CIho 15229) (2).

Mutant used for description and seed stocks:

nar5.o (Az62) 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 Kleinhofs, A. (Unpublished).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. 35:199.