International Database for Barley Genes and Barley Genetic Stocks

BGS 516, Reaction to Septoria passerinii 2, Rsp2

BGN  37:275
Stock number: BGS 516
Locus name: Reaction to Septoria passerinii 2
Locus symbol: Rsp2

Previous nomenclature and gene symbolization:

Resistance to Septoria passerinii Sacc = Sep2 (1, 2).


Monofactorial incomplete dominant (2).
Location in chromosome 1HS (3); about 3.9 cM from the Rsp3 (reaction to Septoria passerinii 3) locus (2); cosegregation with SCAR marker E-ACT/M-CAA-170a and close to the Rsp3 locus (3); about 17.6 cM proximal from marker RFLP Act8 (3).


The Rsp2.b gene conditions a high level of resistance to a single spore culture of Septoria passerinii isolated in Minnesota, USA. Pycnidia are observed in some, but not all lesions, on all F1 plants (2).
No images

Origin of mutant:

Natural occurrence in accession CIho 4780 (PI 70837) (2).

Mutational events:

Rsp2.b in PI 70837 (GSHO 2511) (2).

Mutant used for description and seed stocks:

Rsp2.b in PI 70837 (GSHO 2511).


1. Moseman, J.G. 1972. Report on genes for resistance to pests. Barley Genet. Newsl. 2:145-147.

2. Rasmusson, D.C., and W.E. Rogers. 1963. Inheritance of resistance to septoria in barley. Crop Sci. 3:161-163.

3. Zhong, S., H. Toubia-Rahme, B.J. Steffenson, and K.P. Smith. 2006. Molecular mapping and marker-assisted selection of genes for septoria speckled leaf blotch resistance in barley. Phytopathology 96:993-999.


D.C. Rasmusson. 1988. Barley Genet. Newsl. 18:85 as BGS 466.


J.D. Franckowiak. 1997. Barley Genet. Newsl. 26:442.
J.D. Franckowiak. 2007. Barley Genet. Newsl. 37:275.