International Database for Barley Genes and Barley Genetic Stocks
BGS 198, Reaction to Pyrenophora teres 8, Rpt8
Stock number: BGS 198
Locus name: Reaction to Pyrenophora teres 8
Locus symbol: Rpt8
Previous nomenclature and gene symbolization:
QTL for resistance to Pyrenophora teres seedling 4H = QRpts4 (2).
Monofactorial dominant (1).
Location in chromosome 4HS (1, 2); Rpt8.j is less than 3 cM from SSR markers HVM03 and Bmac181 (1); Rpt8.j is close to SSR marker HVM03 in bin 04 (2),
The reactions of seedlings with the Rpt8.j gene from Q21861 to Pyrenophora teres f. maculata (Ptm) isolates were often measured as 2 to 3 on a scale where 1 = very resistant and 9 = very susceptible (1). A similar disease reaction was recorded for TR251, which may have Rpt8.j gene in combination with the Rpt4.e (reaction to Pyrenophora teres 4) gene (2). A QTL located in chromosome 4H from VB9104 was reported to increase resistance to Ptm in a doubled-haploid population segregating for the Rpt4.e gene (4).
Origin of mutant:
Natural occurrence in Q21861 [PI 584766, selected in 1983 from a barley breeding nursery established at the International Maize and Wheat Improvement Center (CIMMYT) in Mexico] (1, 3).
Rpt8.j in Q21861 (PI 584766) (1); possible Rpt8 alleles are present in TR251 (TR229//AC Oxbow/ND7556) (2) and in VB9104 (Europa/IBON7.148) (4).
Mutant used for description and seed stocks:
Rpt8.j in Q21861.
1. Friesen, T.L., J.D. Faris, Z. Lai, and B.J. Steffenson. 2006. Identification and chromosomal location of major genes for resistance to Pyrenophora teres in a doubled-haploid barley population. Genome, 49:855-859.
2. Grewal, T.S., B.G. Rossnagel, C.J. Ponzniak, and G.J. Scoles. 2008. Mapping quantitative trait loci associated with barley net blotch resistance. Theor. Appl. Genet. 116: 529-539.
3. Steffenson, B.J., Y. Jin, B.G. Rossnagel, J.B. Rasmussen, and K. Kao. 1995. Genetics of multiple disease resistance in a doubled-haploid population of barley. Plant Breed. 114:50-54.
4. Williams, K.J., G.J. Platz, A.R. Barr, J. Cheong, K. Willsmore, M. Cakir, and H. Wallwork. 2003. A comparison of the genetics of seedling and adult plant resistance to the spot form of net blotch (Pyrenophora teres f. maculata). Aust. J. Agric. Res. 54:1387-1394.
J.D. Franckowiak and G.J. Platz. 2013. Barley Genet. Newsl. 43:105.