Table 1.
Hypocotyl length of WT, phytochrome-deficient, and chromophore-deficient mutants grown with or without PΦB and PCB
| Light treatment | WT | phyA | phyB |
hy1
|
hy2
|
||||
|---|---|---|---|---|---|---|---|---|---|
| − | +PΦB | +PCB | − | +PΦB | +PCB | ||||
| D | 12.4 ± 1.2 | 10.2 ± 1.5 | 13.7 ± 1.7 | 11.3 ± 2.3 | 12.1 ± 0.7 | 12.8 ± 1.0 | 11.1 ± 1.3 | 11.1 ± 1.3 | 10.7 ± 1.5 |
| 10.5 ± 2.4 | 7.8 ± 0.8 | 14.4 ± 1.5 | 10.5 ± 2.0 | 9.6 ± 0.4 | 8.6 ± 0.8 | 10.9 ± 0.4 | 8.9 ± 0.3 | 7.8 ± 1.0 | |
| R | P < 0.01 | P < 0.01 | ns | ns | P < 0.01 | P < 0.01 | ns | P < 0.01 | P < 0.01 |
| (t = 5.9) | (t = 9.5) | (t = −2.3) | (t = 2.5) | (t = 14.2) | (t = 18.6) | (t = 0.9) | (t = 10.4) | (t = 11.0) | |
| 6.7 ± 1.0 | 10.7 ± 1.6 | 8.1 ± 0.6 | 11.6 ± 2.3 | 6.2 ± 0.9 | 10.9 ± 1.1 | 11.2 ± 0.6 | 5.9 ± 2.1 | 10.5 ± 0.3 | |
| FR | P < 0.01 | ns | P < 0.01 | ns | P < 0.01 | P < 0.01 | ns | P < 0.01 | ns |
| (t = 23.3) | (t = −1.6) | (t = 22.1) | (t = −0.7) | (t = 27.8) | (t = 7.7) | (t = −0.6) | (t = 16.7) | (t = 0.9) | |
Germinated Arabidopsis seedlings were irradiated with intermittent pulses of monochromatic light (D, kept in darkness; R, intermittent R pulse at 4-h cycles; FR, intermittent FR pulse at 3-min cycles) for 2 days. Values are means (mm) ± SE of 35 plant materials. Two-tailed t tests of mean differences were calculated in R and FR light-treated samples compared with D samples, respectively. ns, no significant differences. t values are given in parentheses.