BGS 511: Resistance to Puccinia graminis Pers. f. sp. tritici Eriks. & L. Henn. (black stem rust), Rpg1a

Previous nomenclature and symbolization:

T for resistance to black stem rust. Puccinia graminis tritici (6, 8).
Inheritance:
Monofactorial dominant (6). Located on chromosome 1 (1. 2. 3. 8).
Description:
The gene confers moderate resistance to most races of P. g. tritici. Lesion size and percent stem and leaf sheath infection 1n adult plants is reduced compared with susceptible plants; thus, providing effective field resistance.
Reaction types observed at low temperatures (20 C) on resistance and susceptible seedlings are 3- or less and 3 or higher, respectively. At high temperatures (20 C) differentiation seedling reaction types, especially with race 56 (5), and correlation with adult plant reaction types is better (4). Differences among cultivars in adult plant reaction suggest that modifiers affect expression of the Ppg1a gene (4).
Origin of mutant:
Natural occurrenoes in Chevron, CI 1111, and Peatland, CI 5276, which were selected from the same introduction in the United States from 5witzerland in 1916 (4.7).
Mutational events:
Rpg1a in Chevron, Cl 1111; and its sister selection Peatland; also in Kindred, Cl 6969, selected from Wis. Ped. 37 in North Dakota.
Mutant used for description and seed stock:
Rpg1a in Chevron, Cl 1111.
References:
  1. Andrews, J. E. 1956. Inheritance of reaction to loose smut Ustilago nuda, and to stem rust, Puccinia graminis tritici, in barley. Can. J. Agr. Sci. 36:356-370.
  2. Brookins, W. W. 1940. Determination of linkage relationships of factors differentiating reaction to stem rust in barley crosses. Ph.D. Thesis, University of Minnesota, St. Paul.
  3. Kramer, H. H., R. Veyl, and W. D. Hanson. 1954. The association of two genetic linkage groups in barley with one chromosome. Genetics 39:159-168.
  4. Miller, J. D. and J. W. Lambert. 1955. Variability and inheritance of reaction of barley to race l5B of stem rust. Aqron. J. 47:373-377.
  5. Patterson, F. L. 1951. Adult plant and seedling reactions of barley varieties and hybrids to 3 races of Puccinia graminis tritici. Ph.D. Thesis. Universitv of Wisconsin. Madison.
  6. Powers, L., and L. Heines. 1933. Inheritance of stem rust reaction and barbing of awns in barley crosses. Jour. Ag. Res. 46:1121-1129.
  7. Shands, R. G. 1939. Chevron, a barley variety resistant to stem rust and other diseases. Phytopathology 29:209-211.
  8. Shands, R. G. 1964. Inheritance and linkage to stem rust and loose smut resistance and starch type in barley. Phytopathology 54:308316.

Prepared:

J. D. Franckowiak, l991.

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