International Database for Barley Genes and Barley Genetic Stocks

BGS 634, Premature ripe 2, pmr2

BGN  32:135
Stock number: BGS 634
Locus name: Premature ripe 2
Locus symbol: pmr2

Previous nomenclature and gene symbolization:

Necroticans 50 = nec-50 (2, 3).


Monofactorial recessive (3).
Location is unknown.


Plants appear normal until shortly before heading. Prior to heading, tan to light brown blotches start to develop on the leaf blades. The blotches enlarge rapidly and coalesce and the leaf blades gradually die (1, 3). Peduncle elongation is poor, and plants are shorter than normal sibs. Although leaf sheaths and spikes remain green, plants ripen prematurely. After the plants ripen, the straw collapses easily. The grain is small and thin (1).

Origin of mutant:

An ethyl methanesulfonate induced mutant in Bonus (NGB 14657, PI 189763) (3).

Mutational events:

pmr2.b (nec-50) (NGB 115311, GSHO 2421), prm2.c (nec-54) (NGB 115316, GSHO 2422) in Bonus (NGB14657, PI 189763) (3).

Mutant used for description and seed stocks:

pmr2.b ( NGB 115311, GSHO 2421) in Bonus; pmr2.b in Bowman (PI 483237)*5 (GSHO 2313); pmr2.b in Bowman*7 (BW646, NGB 22211); pmr2.c in Bowman*6 (BW647, NGB 22212).


1. Franckowiak, J.D. (Unpublished).

2. Gustafsson, Å., A. Hagberg, U. Lundqvist, and G. Persson. 1969. A proposed system of symbols for the collection of barley mutants at Svalöv. Hereditas 62:409-414.

3. Lundqvist, U. (Unpublished).


U. Lundqvist and J. D. Franckowiak. 2002. Barley Genet. Newsl. 32:135.