International Database for Barley Genes and Barley Genetic Stocks
BGS 750, Reaction to Puccinia graminis 6 (wheat stem rust), rpg6
Stock number: BGS 750
Locus name: Reaction to Puccinia graminis 6 (wheat stem rust)
Locus symbol: rpg6
Previous nomenclature and gene symbolization:
Monofactorial recessive (1).
Located in chromosome 6HS (1, 2); rpg6.h is located in the terminal region of 6HS in experimental line 212Y1 as determined by GISH and the PCR-based markers (1, 2).
Seedling resistance (infection type = 120;) to several races of Puccinia graminis f. sp. tritici is conferred by the rpg6.h gene of 212Y1. It is resistant to stem rust races MCCF (avirulent on Rpg1.a and rpg4.d) and QCCJ (virulent on Rpg1.a and avirulent on rpg4.d) at the seedling stage in glasshouse tests (1). Seedling tests indicated that rpg6.h is not effective against the highly virulent African race TTKSK (1). The introgressed region from H. bulbosum in chromosome 6HS of barley is less than 40 cM, or approximately 29% of the chromosomal length of 6H (1).
Origin of mutant:
A spontaneous variant in Hordeum bulbosum identified in accession Cb2920 and transferred to a line from a backcross to Hordeum vulgare cultivar Golden Promise (PI 467829) (1, 2).
rpg6.h from Hordeum bulbosum identified in a doubled haploid line 212Y1 selected from the progeny of the triploid hybrid H. vulgare ‘Golden Promise’ (2n = 2x = 14)/H. bulbosum Cb2920/4/Colch (2n = 4x = 28) crossed to Golden Promise (PI 467829) (2).
Mutant used for description and seed stocks:
Rpg6.h in 212Y1 (1).
1. Fetch, Jr., T., P.A. Johnston, and R. Pickering. 2009. Chromosomal location and inheritance of stem rust resistance transferred from Hordeum bulbosum into cultivated barley (H. vulgare). Phytopathology 99:339-343.
2. Pickering, R.A., S. Malyshev, G. Künzel, P.A. Johnston, V. Korzun, M. Menke, and I. Schubert. 2000. Locating introgressions of Hordeum bulbosum chromatin within the H. vulgare genome. Theor. Appl. Genet. 100:27-31.
J.D. Franckowiak. 2018. Barley Genet. Newsl. 48:179.