Table 2.
Mean square values from analysis of variance (ANOVA) for Y(NPQ), NPQ and Y(NO) of three maize (Zea mays L.) hybrids differing in drought tolerance when two-week-old plants were subjected to three cycles of drought stress.
| Source of Variation | df | Y(NPQ) | NPQ | Y(NO) |
|---|---|---|---|---|
| Treatment | 1 | 1.244 *** | 1.055 *** | 0.005 ns |
| PAR | 10 | 2.042 *** | 5.173 *** | 0.090 *** |
| Maize hybrids. | 2 | 1.112 *** | 1.174 *** | 0.030 *** |
| Treatment * PAR | 10 | 0.065 *** | 0.820 *** | 0.033 *** |
| Treatment * hybrids. | 2 | 1.025 *** | 0.189 *** | 0.246 *** |
| PAR * hybrids. | 20 | 0.062 *** | 0.777 *** | 0.046 *** |
| Treatment * PAR * hybrids. | 20 | 0.073 *** | 0.332 *** | 0.020 *** |
| Error | 198 | 0.001 | 0.023 | 0.001 |
| Total | 263 |
ns = non-significant; *, **, *** significant at 0.05, 0.01 and 0.001 probability levels, respectively.