TABLE 2.
Mean response to Puccinia striiformis f. sp. tritici infection, estimates of variance components, and heritability.
| Parameters | Islamabad (ISB) |
Nowshera (NWS) |
Across Locations |
|||
| IT (0–9) | Severity (%) | IT (0–9) | Severity (%) | IT (0–9) | Severity (%) | |
| Minimum | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Mean | 3.1 | 15.7 | 2.8 | 11.8 | 2.9 | 13.8 |
| Maximum | 8.5 | 90 | 8.5 | 80 | 8.5 | 85 |
| σ2g | 2.9*** | 278.6*** | 4.9*** | 247.7*** | 3.7*** | 255.8** |
| σ2e | 0.9** | 127.3* | 1.9** | 114.7** | 1.5** | 129.6** |
| σ2ge | 3.8ns | 406.0ns | 6.8* | 362.5ns | 5.3* | 385.4ns |
| σ2e | 1.92 | 1.80 | 1.80 | 1.92 | 1.92 | 1.92 |
| Heritability | 0.75 | 0.68 | 0.71 | 0.68 | 0.72 | 0.66 |
σ2g, estimate of genotypic variance; σ2e, estimate of environmental variance; σ2ge, estimate of genotype x environment variance; σ2e, estimate of residual variance; H2, heritability; IT, infection type; DS, disease severity; ns, not significant; *P < 0.05; **P < 0.01; and ***P < 0.001.