Table 1.
The results of contrast analysis of selected biochemical and physiological parameters in sweet cherry leaves exposed to one (CT1), two (CT2) or three (CT3) overnight chillings, sampled at time 0 or time 24 and compared with control in Experiment I.
| CT1 | CT2 | CT3 | ||||
|---|---|---|---|---|---|---|
| 0 | 24 | 0 | 24 | 0 | 24 | |
| Chlorophyll a | ns | ns | ns | ns | ns | ns |
| Chlorophyll b | ns | ns | ns | ns | ns | ns |
| Chlorophyll a/b | ns | ns | ns | ns | ns | ns |
| Total chlorophylls | ns | ns | ns | ns | ns | ns |
| β-carotene | ns | ns | ns | ns | ns | ns |
| Lutein | ns | ns | ns | ns | ns | ns |
| Neoxanthin | ns | ns | ns | ns | ns | ns |
| Violaxanthin | ns | ns | ns | ns | ns | ns |
| Antheraxanthin | ns | ns | ns | ns | ns | ns |
| Zeaxanthin | ns | ns | ns | ns | ns | ns |
| Total carotenoids | ns | ns | ns | ns | ns | ns |
| VAZ | ns | ns | ns | ns | ns | ns |
| AZ/VAZ | ns | ns | ns | ns | ↑*** | ns |
| Fv/Fm | ns | ns | ns | ns | – | – |
*Statistically significant differences at P < 0.05; ***statistically significant differences at P < 0.001; ns, not significant; ↑ = increase in chilled leaves; ↓ = decrease in chilled leaves; –, not monitored; VAZ, xanthophyll cycle pigments; AZ/VAZ, deepoxidation state of xanthophyll cycle pool; Fv/Fm, maximum quantum yield of PS II.