Table 4.
Non-flavonoid content (mg/kg) in Monastrell grapes from grapevines under non-irrigated (rainfed) and regulated deficit irrigation (RDI) conditions.
| Treatments (T) | |||
|---|---|---|---|
| Non-Flavonoids | Rainfed | RDI | p-Value 1 |
| Hydroxybenzoic acids | |||
| Syringic acid | 3.9 ± 0.6 | 1.5 ± 0.2 | 0.058 |
| Gallic acid | 6.1 ± 1.4 | 4.9 ± 0.5 | 0.147 |
| Hydroxycinnamic acids | |||
| trans-Caftaric acid | 1.5 ± 0.3 | 2.5 ± 0.8 | 0.132 |
| trans + cis-Coutaric acids | 1.0 ± 0.1 | 1.6 ± 0.4 | 0.116 |
| Caffeic acid | 1.0 ± 0.1 | 1.0 ± 0.1 | 0.489 |
| trans-Fertaric acid | 1.0 ± 0.1 b | 0.9 ± 0.1 a | ** |
| p-Coumaric acid | 0.4 ± 0.1 | 0.4 ± 0.1 | 0.718 |
| Stilbenes | |||
| trans-Piceid | 4.1 ± 0.2 | 3.9 ± 1.4 | 0.822 |
| cis-Piceid | 0.4 ± 0.1 | 0.4 ± 0.1 | 0.866 |
| trans-Resveratrol | 0.3 ± 0.1 | 0.3 ± 0.1 | 0.558 |
| cis-Resveratrol | 0.3 ± 0.1 | 0.2 ± 0.1 | 0.064 |
For each non-flavonoid, different letters indicate significant differences between treatments (p ≤ 0.05). 1 Statistical significance: ** p ≤ 0.01. When there is no difference between treatments (p > 0.05), no significance letters are shown. Experiments were performed in quadruplicate, and results for each parameter presented as means ± standard deviation (n = 4).