Table I.
Activities of the main antioxidant enzymes in young leaves, cotyledons, and stems of mustard seedlings following heat acclimation in the dark (1 h at 45°C)
| Plant Part and Enzyme | Control | Time after Acclimation (h)
|
||
|---|---|---|---|---|
| 1 | 2 | 3 | ||
| μmol h−1 mg−1 chlorophyll | ||||
| Young leaves | ||||
| APX | 330 ± 48 | 562 ± 101 | 255 ± 63 | 280 ± 52 |
| GR | 70 ± 7 | 145 ± 25 | 86 ± 10 | 92 ± 17 |
| DHAR | 512 ± 96 | 523 ± 91 | 371 ± 85 | 326 ± 54 |
| MDHAR | 42 ± 7 | 60 ± 9 | 26 ± 6 | 18 ± 7 |
| Cotyledons | ||||
| APX | 210 ± 31 | 253 ± 20 | 215 ± 3 | 164 ± 21 |
| GR | 42 ± 5 | 44 ± 6 | 44 ± 5 | 93 ± 9 |
| DHAR | 410 ± 50 | 159 ± 22 | 204 ± 20 | 262 ± 19 |
| MDHAR | 17 ± 3 | 16 ± 3 | 14 ± 1 | 25 ± 4 |
| Stems | ||||
| APX | 615 ± 69 | 622 ± 133 | 635 ± 117 | 643 ± 70 |
| GR | 592 ± 73 | 718 ± 183 | 511 ± 26 | 585 ± 79 |
| DHAR | 980 ± 208 | 1001 ± 237 | 1024 ± 139 | 1226 ± 110 |
| MDHAR | 129 ± 19 | 87 ± 20 | 63 ± 9 | 170 ± 27 |
Values are ±se (n ≥ 4).