Conference paper
Genetics of rust resistance in the Australian wheat germplasm
11th International Wheat Genetics Symposium 2008 (Brisbane, QLD, 24/08/2008–29/08/2008)
2008
Abstract
F2 and F2:3 populations targeting leaf rust resistance genes (Lr13, Lr21 Lr28) and stem rust resistance genes (Sr32 and Sr33) were phenotyped for seedling resistance. In populations targeting Lr13 (Leichardt/WAWHT2071), Lr21 (Tincurrin+Lr21/EGA2248) and Lr28 (Sunland/Arrino), parents Leichardt, Tincurrin+Lr21 and Sunland were resistant (R) while parents WAWHT2071, EGA 2248 and Arrino were susceptible (S) to leaf rust. F2 progeny in crosses Leichardt/WAWHT2071 and Sunland/Arrino showed a 3R:1S segregation ratio (χ2 = 0.3 and 1.3; P = 0.6 and 0.3) while F3 families segregated as 1:2:1 (true breeding R (TR):segregating (seg):true breeding S (TS)) (χ2 = 1.8 and 1.0; P = 0.4 and 0.6) indicating the single dominant nature of Lr13 and Lr28. Population Tincurrin+Lr21/EGA 2248 targeting Lr21 showed a 13R:3S F2 segregation (χ2 = 0.4; P = 0.5) indicating the presence of one dominant and one recessive independent genes. The hypothesis was confirmed in F3 where families arising from resistant F2 plants segregated in a ratio of 7:6 (TR:seg) while families from susceptible F2 plants were all true breeding susceptible (χ2 = 1.4; P = 0.5). In populations targeting Sr32 and Sr33 parents C77.19/3*77W:549-163658 and Sr33/2*Shortim//4*Jacup were used as the sources of resistance, respectively, while parents WAWHT2046 and Calingiri were susceptible to stem rust. The F2 progeny in both crosses segregated into a 3R:1S ratio (χ2 = 0.1 and 3.3; P = 0.8 and 0.1) and the F3 families showed a segregation of 1:2:1 (TR:seg:TS ) (χ2 = 5.5 and 1.2; P = 0.1 and 0.6) indicating the single dominant nature of Sr32 and Sr33.
Details
- Title
- Genetics of rust resistance in the Australian wheat germplasm
- Authors/Creators
- M. Shankar (Author/Creator)R. McLean (Author/Creator)M. Cakir (Author/Creator)H. Golzar (Author/Creator)H. Bariana (Author/Creator)R. Loughman (Author/Creator)
- Conference
- 11th International Wheat Genetics Symposium 2008 (Brisbane, QLD, 24/08/2008–29/08/2008)
- Identifiers
- 991005541391207891
- Murdoch Affiliation
- State Agricultural Biotechnology Centre
- Language
- English
- Resource Type
- Conference paper
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