Table 1. First and second degree statistics for 135 inbred lines and 1604 hybrids derived from them for resistance against powdery mildew, leaf rust and stripe rust evaluated in field trials at three to four environments.
| Source of variation | Powdery mildew (1–9) | Leaf rust (1–9) | Stripe rust (1–9) |
|---|---|---|---|
| Means (ranges) | |||
| Lines | 2.74 (1.07–5.44) | 2.88 (0.40–6.90) | 1.66 (0.88–6.00) |
| Hybrids | 2.97 (0.92–5.97) | 2.97 (0.13–7.54) | 1.66 (0.76–6.01) |
| Variances | |||
| σ2Lines | 0.52a | 1.40a | 0.0073a |
| σ2Hybrids | 0.57a | 1.36a | 0.0045a |
| σ2GCA—Female | 0.48a | 1.05a | 0.0019a |
| σ2GCA—Male | 0.06a | 0.07a | 0.0012a |
| σ2SCA | 0.04a | 0.08a | 0.0012a |
| σ2GCA—Female × Environment | 0.08a | 0.59a | 0.0019a |
| σ2GCA—Male × Environment | 0.01a | 0.02a | 0.0011a |
| σ2e | 0.43 | 0.99 | 0.0093 |
| HeritabilityLines | 0.79 | 0.85 | 0.76 |
| HeritabilityHybrids | 0.77 | 0.75 | 0.58 |
Abbreviations: GCA, general combining ability; SCA, specific combining ability.
Disease resistance was scored from 1 (no damage) to 9 (no plant survived).
a
significantly different from zero at 0.001 level of probability.