International Database for Barley Genes and Barley Genetic Stocks

BGS 261, Necrotic leaf spot 2, nec2

BGN  26:241
Stock number: BGS 261
Locus name: Necrotic leaf spot 2
Locus symbol: nec2

Previous nomenclature and gene symbolization:

Mutant no 7 (1).
Necrotic leaf spots 2 = nec2b (2).


Monofactorial recessive (1).
Located in chromosome 6HS (1); nec2.b is about 5.2 cM from the rob1 (orange lemma 1) locus (3).


Small, dark brown necrotic spots appear on the leaves of field grown plants 3 to 6 weeks after germination. Margins of the spots have poor demarcation, and the expression of necrotic spot is not good some years (3).
No images

Origin of mutant:

An ethyl methanesulfonate induced mutant in Carlsberg II (NGB 5085, CIho 10114) (1).

Mutational events:

nec2.b (Mutant no 7, GSHO 1224), nec2.c (Mutant no 9) in Carlsberg II (NGB 5085, CIho 10114) (1).

Mutant used for description and seed stocks:

nec2.b (GSHO 1224) in Carlsberg II.


1. Jensen, J. 1971. Mapping of 10 mutant genes for necrotic spotting in barley by means of translocations. p. 213-219. In R.A. Nilan (ed.) Barley Genetics II. Proc. Second Int. Barley Genet. Symp., Pullman, WA, 1969. Washington State Univ. Press, Pullman.
2. Jensen, J. 1981. Effect of temperature on genetic recombination in barley. Hereditas 94:215-218.
3. Jensen, J. 1981. BGS 261, Necrotic leaf spots, nec2b. Barley Genet. Newsl. 11:102.


J. Jensen. 1981. Barley Genet. Newsl. 11:102.


J.D. Franckowiak. 1997. Barley Genet. Newsl. 26:241.