BGS 122, Reaction to Puccinia hordei 5 (barley leaf rust), Rph5

Resistance to Puccinia hordei Otth 5 = Pa5 (6, 7).
Resistance to Puccinia hordei B = B (5).
Resistance to Puccinia hordei Otth = X (5, 6).
Resistance to Puccinia hordei Otth = Pax (6).
Resistance to Puccinia hordei 6 = Rph6.f (11).

Monofactorial incomplete dominant (3, 5, 6).
Located in chromosome 3HS (4, 11); Rph5.e is about 7.0 cM distal from Rph7 (Reaction to Puccinia hordei 7) (11), Rph5.e is about 0.5 cM proximal from RFLP marker CDO549 (11); Rph5.e is about 2.5 cM distal from RFLP marker MWG2021 (4).

Rph5.e in Magnif 102 showed a seedling infection type of 0 - 0;c with race 4 culture 57-19, and Rph6.f from Bolivia had a 0;n - 1c seedling infection type with race 4 culture 57-19. (3). Heterozygotes frequently show an intermediate response (type 2 or 3 reaction) to inoculation with pathogenic races, and incomplete dominance is observed in segregating progenies (3, 5, 6). Zhong et al. (11) demonstrated that Rph5.e is allelic to the Rph6.f gene extracted from Bolivia (PI 36360). Rph6.f was identified as a monofactorial dominant, but an allele at the Rph2 (reaction to Puccinia hordei 2) locus is present in the original cultivar Bolivia (PI 36360) (5, 6, 8).

Natural occurrence in Quinn (PI 39401) (6, 10); natural occurrence in Bolivia (PI 36360) (2, 5).

Rph5.e in Magnif 102 (PI 337140, GSHO 1597) (10), Rph5.f (formerly Rph6.f) in Bolivia (PI 36360) (11), Rph5.ai in Quinn (PI 39401) along with Rph2.q (5, 6).

Rph5.e in Malteria Heda*4/Quinn (Magnif 102, GSHO 1597) (10); Rph5.f in Bolivia (GSHO 1598); Rph5.e in Bowman (PI 483237)*8 (GSHO 1865, BW755, NGB 22461); Rph5.f (without an Rph2 allele) in Bowman*8 (GSHO 2323, PI 643154, BW756, NGB 22462) (1).

1. Chicaiza, O., J.D. Franckowiak, and B.J. Steffenson. 1996. Backcross-derived lines of barley differing for leaf rust resistance genes. pp. 198-200. In G.H.J. Kema, R.E. Niks, and R.A. Daamen (eds.) Proc. 9th Eur. & Medit. Cereal Rusts & Mildews Conf. Drukkerij Ponsen en Looijen B.V., Wageningen.
2. Henderson, M.T. 1945. Studies of the sources of resistance and inheritance of reaction to leaf rust, Puccinia anomala Rostr., in barley. Ph.D. Thesis. Univ. of Minnesota, St. Paul.
3. Jin, Y., G.H. Cui, B.J. Steffenson, and J.D. Franckowiak. 1996. New leaf rust resistance genes in barley and their allelic and linkage relationships with other Rph genes. Phytopathology 86:887-890.
4. Mammadov, J.A., J.C. Zwonitzer, R.M. Biyashev, C.A. Griffey, Y. Jin, B.J. Steffenson, and M.A. Saghai Maroof. 2003. Molecular mapping of leaf rust resistance gene Rph5 in barley. Crop Sci. 43:388-393.
5. Roane, C.W. 1962. Inheritance of reaction to Puccinia hordei in barley. I. Genes for resistance among North American race differentiating varieties. Phytopathology 52:1288-1295.
6. Roane, C.W., and T.M. Starling. 1967. Inheritance of reaction to Puccinia hordei in barley. II. Gene symbols for loci in differential cultivars. Phytopathology 57:66-68.
7. Roane, C.W., and T.M. Starling. 1970. Inheritance of reaction to Puccinia hordei in barley. III. Genes in the cultivars Cebada Capa and Franger. Phytopathology 60:788-790.
8. Starling, T.M. 1955. Sources, inheritance, and linkage relationships of resistance to race 4 of leaf rust (Puccinia hordei Otth), race 9 of powdery mildew (Erysiphe graminis hordei El. Marchal), and certain agronomic characters in barley. Iowa State Coll. J. Sci. 30:438-439.
9. Starling, T.M. 1956. Sources, inheritance, and linkage relationships of resistance to race 4 of leaf rust (Puccinia hordei Otth), race 9 of powdery mildew (Erysiphe graminis hordei El. Marchal), and certain agronomic characters in barley. Iowa State Coll. J. Sci. 30:438-439.
10. Yahyaoui, A.H., and E.L. Sharp. 1987. Virulence spectrum of Puccinia hordei in North Africa and the Middle East. Plant Dis. 71:597-598.
11. Zhong, S., R.J. Effertz, Y. Jin, J.D. Franckowiak, and B.J. Steffenson. 2003. Molecular mapping of the leaf rust resistance gene Rph6 in barley and its linkage relationships with Rph5 and Rph7. Phytopathology 93:604-609.

C.W. Roane. 1976. Barley Genet. Newsl. 6:122.
J.D. Franckowiak and Y. Jin. 1997. Barley Genet. Newsl. 26:501, as BGS 575, Reaction to Puccinia hordei 6, Rph6.

J.D. Franckowiak and Y. Jin. 1997. Barley Genet. Newsl. 26:157.
J.D. Franckowiak and B.J. Steffenson. 2005. Barley Genet. Newsl. 35:188.
J.D. Franckowiak. 2007. Barley Genet. Newsl. 37:224-225.