Table 12.
Interactions means ± SE for the effects of year, production system and grape type (red vs. black) on the concentrations of individual anthocyanin compounds in grapes produced in the Mediterranean.
| Parameter | Factor 3 | |||
|---|---|---|---|---|
| Factor 1 | Factor 2 | Grape Type | ||
| Year | Production System | Black | Red | |
| delphinidin 3-O-glucoside (mg FW kg−1) |
2015 | Organic | 74 ± 27 a B | 15.7 ± 7.0 b A |
| Conventional | 32 ± 8 a B | 5.3 ± 2.0 b A | ||
| 2016 | Organic | 69 ± 25 a B | 0.2 ± 0.1 b A | |
| Conventional | 193 ± 136 a A | 0.8 ± 0.6 b A | ||
| petunidin 3-O-glucoside (mg FW kg−1) |
2015 | Organic | 132 ± 392 a B C | 12.6 ± 5.6 b A |
| Conventional | 72 ± 15 a C | 6.2 ± 1.7 b A | ||
| 2016 | Organic | 163 ± 50 a B | 0.5 ± 0.2 b A | |
| Conventional | 314 ± 198 a A | 1.6 ± 0.9 b A | ||
| peonidin 3-O-glucoside (mg FW kg−1) |
2015 | Organic | 325 ± 105 a BA | 122 ± 20 a A |
| Conventional | 173 ± 50 a B | 355 ± 98 a B | ||
| 2016 | Organic | 217 ± 29 a B | 184 ± 24 a A B | |
| Conventional | 670 ± 570 a A | 238 ± 69 b A B | ||
For each parameter assessed means labeled with the same lower case letter within the same row and same capital letters within the same column are not significantly different (General Linear Hypothesis test p < 0.05).