Table 1.
Compounds detected in hexane extracts made from uninfected and Phytophthora cactorum-infected Populus trichocarpa roots. Means and SE in μg/g fresh weight are shown (n = 7–8).
| Compound | Uninfected Roots | Infected Roots | t-Value/T-Value | p-Value |
|---|---|---|---|---|
| Aromatic compounds | ||||
| Benzylalcohol # | 0.22 ± 0.20 | 0.77 ± 0.20 | 48.00 (WR) | 0.038 * |
| Salicylaldehyde # | 4.02 ± 1.00 | 4.93 ± 1.79 | 0.02 (ST) | 0.988 |
| 2-Phenylethanol # | 0.11 ± 0.04 | 0.74 ± 0.23 | 39.00 (WR) | <0.001 *** |
| Benzyl salicylate | n.q. | n.q. | - | - |
| Terpenes | ||||
| Limonene # | n.q | n.q | - | - |
| 1,8-Cineole # | n.q | n.q | - | - |
| α-Terpineol # | 0.10 ± 0.03 | 0.44 ± 0.05 | 5.26 (ST) | <0.001 *** |
| Elemol | 0.01 ± 0.01 | 0.27 ± 0.09 | 40.50 (WR) | 0.002 ** |
| Guaia-4(15)-en-11-ol # + Guaia-4-en-11-ol # | 0.04 ± 0.04 | 4.31 ± 1.35 | 36.00 (WR) | <0.001 *** |
| Fatty acids/aldehydes | ||||
| (E)-4-Nonenal | n.q. | n.q. | - | - |
| Myristaldehyde | 3.16 ± 0.34 | 8.53 ± 2.17 | 3.13 (ST) | 0.007 ** |
| Myristic acid # | 0.40 ± 0.08 | 6.13 ± 1.59 | 8.19 (ST) | <0.001 *** |
| Pentadecanoic acid # | 1.51 ± 0.30 | 4.49 ± 0.51 | 38.00 (WR) | <0.001 *** |
| Palmitic acid # | 24.53 ± 3.57 | 72.04 ± 6.13 | 36.00 (WR) | <0.001 *** |
| Oleic acid # | 5.04 ± 0.92 | 7.34 ± 1.09 | 1.51 (ST) | 0.154 |
| Stearic acid # | 1.65 ±0.19 | 5.29 ± 0.71 | 6.39 (ST) | <0.001 *** |
| Others | ||||
| 1-Hexanol | 0.14 ± 0.01 | 0.17 ± 0.01 | 12.00 (WR) | 0.038 * |
| Unidentified compound | traces | 1.64 ± 0.88 | 40.00 (WR) | 0.002 ** |
Asterisks indicate statistical significance between uninfected roots and infected roots as assessed by Student’s t-test (ST) or Wilcoxon rank sum test (WR) (*, p ≤ 0.05; **, p ≤ 0.01; ***, p ≤ 0.001). n.q., not quantified due to trace amounts or incomplete separation. Compounds marked with # were identified using authentic standards.