Table 2 Average values (±standard deviation) for the timing (number of days) of bud burst (the slope of a linear regression line between first, 50 % and 100 % bud bursts) for conditions with different chilling durations (CD; chilling days) and photoperiod lengths (Photo) and analysis of variance results for the effects of photoperiod (P), chilling duration (C) and interaction between both effects (C × P) on the timing of bud burst
Photo (h) | Average values | ANOVA results | ||||||
|---|---|---|---|---|---|---|---|---|
CD (days) | Betula pubescens | Populus tremula | Effect | B. pubescens | P. tremula | |||
F (df) | p | F (df) | p | |||||
Experiment 1 | ||||||||
8 | 35 | 15.0 ± 6.4 | – | C | 55.21 (1) | <0.001 | – | – |
8 | 82 | 3.9 ± 2.5 | 8.6 ± 2.6 |  |  |  |  |  |
12 | 35 | 18.3 ± 2.7 | – | P | 2.94 (2) | 0.073 | 0.67 (2) | 0.537 |
12 | 82 | 2.8 ± 0.8 | 7.3 ± 2.9 |  |  |  |  |  |
16 | 35 | 8.6 ± 4.3 | – | C × P | 5.48 (2) | 0.011 | – | – |
16 | 82 | 4.4 ± 3.2 | 9.6 ± 2.3 |  |  |  |  |  |
Experiment 2 | ||||||||
10 | 25 | – | 42.9 ± 19.2 | C | 2.96 (2) | 0.067 | 22.10 (2) | <0.001 |
10 | 53 | 4.6 ± 1.4 | 22.4 ± 19.6 |  |  |  |  |  |
10 | 76 | 6.5 ± 1.2 | 6.3 ± 2.2 | P | 2.95 (1) | 0.096 | 3.64 (1) | 0.064 |
16 | 25 | 6.5 ± 3.1 | 32.0 ± 16.0 |  |  |  |  |  |
16 | 53 | 4.6 ± 2.7 | 11.1 ± 6.7 | C × P | 2.95 (1) | 0.096 | 0.94 (2) | 0.401 |
16 | 76 | 3.8 ± 1.1 | 6.3 ± 2.2 |  |  |  |  |  |