International Database for Barley Genes and Barley Genetic Stocks

BGS 651, Late maturity 1, lam1

BGN  43:174
Stock number: BGS 651
Locus name: Late maturity 1
Locus symbol: lam1

Previous nomenclature and gene symbolization:



Monofactorial recessive (1).
Location is unknown.


Mutant plants have a very prostrate growth habit and heading is delayed to very late in the season, and sometimes they do not head. During juvenile stages before the reproductive phase is induced, lam1.a plants have very narrow, long leaf blades. Leaves produced during the reproductive phase have wide, short leaf blades (1). The cultivar Steptoe in which the mutant was induced has a winter growth pattern.

Origin of mutant:

A fast neutron induced mutant in Steptoe (CIho 15229) (1).

Mutational events:

lam1.a (FN2, GSHO 3653) in Steptoe (CIho 15229) (1). Several other late heading mutants in Steptoe have been isolated following treatment with mutagenic agents, but allelism tests have not been completed. The mutants and their temporary gene symbols are: lam.b (FN197), lam.c (FN208), lam.d (FN209), lam.e (FN212), and lam.f (FN229) in Steptoe (1).

Mutant used for description and seed stocks:

lam1.a (FN2, GSHO 3653) in Steptoe.


1. Kleinhofs, A. (Unpublished).


A. Kleinhofs. 2005. Barley Genet. Newsl. 35:209.


A. Kleinhofs. 2013. Barley Genet. Newsl. 43:174.