Table 4.
Comparison of infection types in seedlings from a line homozygous for Yr35 and from F3 plants (cross PI 519805 × Avocet ‘S’) homozygous for the resistance (R) and susceptibility (S) alleles of SNP marker IWA7257 (linked to Yr78)
| PSTv-4 | PSTv-14 | PSTv-37 | PSTv-40 | PSTv-51 | |
|---|---|---|---|---|---|
| Yr35 (homozygous) | 2(14),3(5) | 2(11),3(6),5(3) | 2(9),3(10) | 1(3),2(17),3(2) | 2(17),3(2) |
| IWA7257 TT (R) | 8(21) | 8(19) | 8(21) | 5(2),7(5),8(12) | 7(5),8(15) |
| IWA7257 TT (R) | 8(19) | 8(21) | 8(20) | 7(4),8(14) | 7(5),8(15) |
| IWA7257 GG (S) | 8(21) | 8(21) | 8(20) | 8(19) | 8(22) |
| IWA7257 GG (S) | 8(20) | 8(21) | 8(21) | 8(20) | 7(3),8(16) |
| IWA7257 GG (S) | 8(21) | 8(20) | 8(21) | 7(5),8(15) | 8(20) |
| Avocet ‘S’ | 8(20) | 8(20) | 8(20) | 8(20) | 8(20) |
All the selected F3 plants were homozygous for the susceptibility allele of QYr.ucw-1BL located on the long arm of chromosome 1B
Infection types (ITs) recorded 20–22 days after inoculation using McNeal’s 0–9 scale (Line and Qayoum 1992). Numbers in parentheses indicate the number of tested plants