Table 2.
Effect of different concentrations of phenolic compounds from the Cistus ladanifer exudate on Lactuca sativa germination (%TG) and germination rate (%S), expressed as the percentage relative to the control. Four replicates of each treatment (n = 4 × 50 = 200 seeds in total for each solution).
| Lactuca sativa | ||||||
|---|---|---|---|---|---|---|
| %TG | %S | |||||
| Treatment | 1 mM | 0.5 mM | 0.1 mM | 1 mM | 0.5 mM | 0.1 mM |
| Paper | ||||||
| p-cresol | 92.1 * a ´ | 96.2 * a ´ | 99.7 a | 69.9 * a ´ | 76.0 * b ´ | 88.0 c ´ |
| 2-phenylethanol | 96.7 * a ´ | 97.2 a ´ | 101.2 a | 64.4 * a ´ | 86.0 * b ´ | 90.3 b ´ |
| 3-phenyl-1-propanol | 99.2 a ´ | 97.2 a ´ | 99.2 a | 80.8 * a ´ | 84.8 * a ´ | 87.9 a ´ |
| Mixture of compounds | 0.0 * a | 63.9 * b | 97.9 c | 0.0 * a | 17.0 * b | 65.3 * c |
| Soil | ||||||
| p-cresol | 100.0 a ´ | 100.0 a ´ | 100.0 a ´ | 71.5 * a ´ | 80.9 * b ´ | 81.1 * b ´ |
| 2-phenylethanol | 108.8 a ´ | 100.0 a ´ | 100.0 a ´ | 68.4 * a ´ | 78.5 * b ´ | 73.9 * ab ´ |
| 3-phenyl-1-propanol | 100.0 a ´ | 100.0 a ´ | 100.0 a ´ | 75.7 * a ´ | 81.1 * a ´ | 82.7 * a ´ |
| Mixture of compounds | 92.0 * a | 86.5 * a | 92.0 a | 38.6 * a | 44.1 * a | 59.7 * b |
* Significantly different from controls. ´ Significantly different from mixture of compounds. a, b, c: differences in small letters indicate significant differences between concentrations of the same index and for each treatment. p < 0.05 (Mann–Whitney U test).