International Database for Barley Genes and Barley Genetic Stocks

BGS 650, Sensitivity to Ustilago nuda 1, sun1

BGN  43:173
Stock number: BGS 650
Locus name: Sensitivity to Ustilago nuda 1
Locus symbol: sun1

Previous nomenclature and gene symbolization:



Monofactorial recessive (1).
Location is unknown.


Mutant plants appear extremely susceptible to infection by loose smut, Ustilago nuda (Jensen) Rostr. Spikes of infected sun1.a plants become entirely smutted under field conditions at Pullman, WA, USA, an environment where loose smut infection is rare (1). The occurance of infected plants is much more frequent in seed lots from sun1.a plants than in those from other susceptible cultivars (1).

Origin of mutant:

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

Mutational events:

sun1.a (FN395, GSHO 3650) in Steptoe (CIho 15229) (1).

Mutant used for description and seed stocks:

sun1.a (FN395, GSHO 3650) in Steptoe.


1. Kleinhofs, A. (Unpublished).


A. Kleinhofs. 2005. Barley Genet. Newsl. 35:208.


A. Kleinhofs. 2013. Barley Genet. Newsl. 43:173.