Table 4.
Estimation of absolute quantities of volatiles and sugars detected in rhizosphere mesocosms containing Taraxacum sect. ruderalia plants and sampled by polydimethylsiloxane (PDMS) tubes with direct contact to substrate (volatiles) or by aqueous extraction (sugars)
| # | Ref. | Compounda | KI (HP-5 ms) | Amount (ng) (mean ± SD) |
|---|---|---|---|---|
| Volatiles | ||||
| 1 | ♦ | 2-ethyl-1-hexanol (likely a contamination) | 1032 | 156.2 ± 129.6 |
| 2 | ♦ | methyl salicylate | 1195 | 20.6 ± 47.5 |
| 3 | ♦ | 2-phenoxyethanol | 1221 | 11.2 ± 24.7 |
| 4 | ♣ | panaginsene | 1335 | Not quantified |
| 5 | ♦ | pethybrene | 1377 | 52 ± 41.2 |
| 6 | ♣ | african-2-ene | 1385 | Not quantified |
| 7 | ♦ | α-isocomene | 1388 | 187.9 ± 218.5 |
| 8 | ♦ | β-elemene | 1398 | 7.1 ± 5.9 |
| 9 | m/z: 119(100), 189(76), 161(70), 204(32), 91(24); M: 204 | 1447 | Not quantified | |
| 10 | ♦ | β-farnesene | 1458 | 1.9 ± 3.1 |
| 11 | m/z: 109(100), 110(56), 204(43), 79(41), 93(28); M: 204 | 1463 | Not quantified | |
| 12 | ● | γ-selinene | 1485 | Not quantified |
| 13 | ♦ | β-selinene (eudesma-4(14),11-diene) | 1493 | 48.1 ± 80.2 |
| 14 | ♦ | α-selinene | 1497 | 62.2 ± 95.4 |
| 15 | ♦ | farnesyl acetate | 1843 | 0.6 ± 1.85 |
| Sugars | ||||
| 16 | ♦ | fructose | – | 40.7 ± 48.6 |
| 17 | ♦ | glucose | – | 197 ± 143.3 |
| 18 | ♦ | sucrose | – | 279.9 ± 239.8 |
a Extraction of compounds from the central compartment (volatiles) and substrate compartment (sugars) of a rhizosphere mesocosm with dandelion plants (N = 6 biological replicates, corresponding to 6 mesocosms containing groups of 10 plants each). No sugars were detected in the drainage compartment. All 15 volatiles have been found in the central compartment, whereas the substrate and drainage compartments contained only 12 and 8 of the compounds, respectively
●: Identification via NIST library (Mass spec. match >95 % and KI ± 5)
♣: Identification via MassFinder
♦: Compared to reference compound (Mass ± spec. match >95 % and KI ± 5)