Table 1.
Chemical characteristics, auxin and gibberellin-like (IAA-like and GA-like) activities, and content of indoleacetic acid (IAA) and isopentenyladenosine (IPA) hormones in hawthorn (HN), red grape skin (RGS) and blueberry (BB) extracts.
| Variable | HN | RGS | BB |
|---|---|---|---|
| pH | 2.9 | 2.9 | 2.9 |
| Total sugars (g/L) | 8.4 b* | 5.7 c | 12.4 |
| Gallic acid (mg/L) | 4.5 a | 2.63 b | n.d. |
| Chlorogenic acid (mg/L) | 20.1b | n.d. | 46.0 a |
| Vanillic acid (mg/L) | 3.6 b | 8.84 a | n.d. |
| Caffeic acid (mg/L) | 21.8 a | n.d. | 4.85 b |
| p-Coumaric acid (mg/L) | 2.2 | n.d. | n.d. |
| p-Hydroxybenzoic acid (mg/L) | 150.8 b | 152.3 b | 303.5 a |
| Total phenolic acids (mg/L) | 1140 b | 970 c | 4830 a |
| IAA-like † | 1.50·10−2 | n.d. | n.d. |
| GA-like † | 1.09·10−7 b | 1.34·10−6 a | n.d. |
| IAA (nMol) | 14.6 a | 11.6 b | 14.9 a |
| IPA (nMol) | 4.1 a | 4.91 a | 2.9 b |
n.d., not detectable. † mg/L hormone corresponding to 1.0 mL/L of vegetal extracts. * In each row, mean values with different letters significantly differ for P ≤ 0.05 by Student-Newman-Keuls test.