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Genetics of rust resistance in the Australian wheat germplasm

Shankar, M., McLean, R., Cakir, M., Golzar, H., Bariana, H. and Loughman, R. (2008) Genetics of rust resistance in the Australian wheat germplasm. In: 11th International Wheat Genetics Symposium 2008, 24 - 29 August 2008, Brisbane, QLD



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.

Item Type: Conference Paper
Murdoch Affiliation(s): Western Australian State Agricultural Biotechnology Centre
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