Table 4.
Effect of exogenous kinetin on the antioxidant activities of coffee leaves under optimum and cold stress conditions.
| Parameter | Optimum Condition | Cold Stress Conditions | ||
|---|---|---|---|---|
| Control | Kinetin | Cold | Cold + Kinetin | |
| DPPH IC50 µgDW mL−1 | 125.8 ± 21.5 Ba | 114.4 ± 12.7 Aa | 154.0 ± 8.5 Aa | 1102.8 ± 7.2 Ab |
| DPPH TEAC (µmoL Trolox gDW−1) | 211.3 ± 0.1 Ab | 317.9 ± 30.5 Aa | 190.2 ± 10.6 Ab | 270.1 ± 35. 2 Ba |
| ABTS TEAC (µmoL Trolox gDW−1) | 262.2 ± 3.0 Aa | 277.2 ± 19.4 Aa | 236.9 ± 23.3 Ab | 281.6 ± 7.15 Aa |
| FRAP TEAC (µmoL Trolox gDW−1) | 752.5 ± 73.8 Ab | 1138.6 ± 169.6 Aa | 542.1 ± 48.4 Bb | 938.7 ± 78.6 Ba |
Within a row, different capital letters, (A, B) denote statistically significant differences between the parameter means within temperature treatments, whereas different small letters, (a, b) denote the statistically significant differences for the parameter means within kinetin treatments (p < 0.05, Newman–Keuls test). Data are expressed as means ± S.D (n = 3).