Table 4.
Recovery from high light stress as determined by chlorophyll a fluorescence
| Tukey level | % Recovery (means±SD) | |
| Ecotype Col | ||
| Wild type (100) | A | 37.0±4.2 |
| phot2 | A | 35.4±13.2 |
| phot1 | AB | 34.7±9.3 |
| phot1/phot2 | BC | 25.5±6.7 |
| arc6-4 (2) | C | 20.6±5.8 |
| Ecotype Ler | ||
| arc5-1/11–1 (12) | A | 47.7±4.6 |
| arc3-1 (18) | A | 45.0±9.9 |
| wild type (120) | A | 44.1±6.4 |
| arc5-1 (13) | A | 42.5±5.5 |
| arc1-1 (108) | AB | 41.4±3.5 |
| arc11-1 (30) | AB | 40.9±8.0 |
| arc6-1 (2) | AB | 37.4±7.7 |
| arc6-1/1–1 (9) | B | 32.8±12.9 |
| Ecotype Ws | ||
| arc9-1 (34) | A | 36.2±3.8 |
| Wild type (85) | A | 34.6±4.4 |
| arc10-1 (38) | A | 34.5±6.2 |
| arc7-1 (80) | A | 32.2±7.8 |
| arc8-1 (45) | A | 31.3±7.8 |
| arc6-1 (2) | B | 17.5±4.7 |
Arabidopsis thaliana leaves from wild-type and mutant plants (ecotypes Columbia, Landsberg erecta, and Wassilewskija) were exposed for 30 min to low light (5 μmol photons m−2 s−1), followed by 180 min of high light (1500 μmol photons m−2 s−1), followed by 60 min of recovery at low light (5 μmol photons m−2 s−1). The temperature was kept at 10 °C throughout the entire experiment. The yield (photochemical efficiency of photosystem II) was measured at 10 min intervals throughout the low light periods, and at 30 min intervals throughout the high light period (n=12–16). The values for percentage recovery were calculated using the yield values just before the start of the 180 min high light stress treatment and those at the end of the 60 min recovery at low light. The numbers in brackets after the plant types represent the average chloroplast number per mesophyll cell. One-way ANOVA for Col: F=8.3, df = 4,63, P < 0.0001; for Ler: F=4.6; df = 7,92, P=0.0002; for Ws: F=15.8, df = 5,66, P < 0.0001. Groups not connected by the same letter are significantly different (Tukey–Kramer HSD).