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Mapping leaf rust resistance genes in wheat

Mapping leaf rust resistance genes in wheat

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Mapping leaf rust resistance genes in wheat

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  1. Mapping leaf rust resistance genes in wheat Jim Kolmer USDA-ARS Cereal Disease Laboratory Jim Anderson Univ. of Minnesota Thanks to Kun Xiao, Jen Flor

  2. RL6149 RL6149 = Thatcher*6/T. turgidum 8404 Developed by P. Dyck RL6149 IT is ; (fleck) 20-50 MRMS Thatcher x RL6149 F2 (: - 3) 100 (3+4) 30 F3 families 32 HR 63 Seg 25 HS

  3. RL6149 F3 families used for mapping 6AL location – flanked by Barc104 (13.9cm) and GWM427 (21 cm) No other Lr gene on 6AL Designated as Lr64

  4. RL6062 RL6020 = Thatcher*6/ PI268316 Developed by P. Dyck PI268316 common wheat RL6062 22+ IT 30-50 MRMS Thatcher x RL6062 F2 (2-2+ ) 90 (3-4) 43 F3 families 26 HR 73 SEG 36 HS Infection type F2

  5. RL6062 Polymorphic SSR markers not linked to resistance gene Bulk Segregation Analysis 15 HR 15 HS F3 families 8 DArT markers on 6BL in disequilibrium – distal region SSR data Lr3 - Lr9 – linkage? RL6062 isolate specificity different P. L. Dyck - 1980

  6. Americano 25eUruguay landrace derived1918 – highly resistant Tc*2/Americano 25e F6 Adult plant resistance – no seedling resistance 10-20 MRMS field resistance 0;2- adult plant IT greenhouse test Tc*3/ Americano 25e F6 lines Three field tests – greenhouse test 1-2 genes segregating Severity (%)

  7. Tc*3/Americano 25e F6 lines DArT map Major effect on 1BL – likely Lr46 Select Tc*3 lines with Lr46 only

  8. Tc*3/Americano 25e F6 lines Smaller effect on 5B No effect St Paul 2010 (fewer high severity lines) Select Tc*3 lines with 5B QTL

  9. Tc*3/Americano 25e F6 linesR2 values