Table II.
Volatiles emitted by tomato plants
| Compound
|
Calculated IK
|
Total Emission by Control Plants
|
Total Emission by Spider Mite-Infested Plants
|
P-Value (Infested Plants Versus Control Plants)
|
|---|---|---|---|---|
| μg/plant/5 d | μg/plant/5 d | |||
| β-myrcene | 988.1 | 0.008 ± 0.008 | 0.02 ± 0.02 | 0.558 |
| 2-carene | 1000.0 | 0.1 ± 0.1 | 0.5 ± 0.3 | 0.247 |
| α-terpinene | 1017.5 | 0.0003 ± 0.0003 | 0.03 ± 0.03 | 1.000 |
| p-cymene | 1022.3 | 1.1 ± 0.8 | 0.2 ± 0.1 | 0.144 |
| β-phellandreneA | 1025.0 | 19.5 ± 5.8 | 19.6 ± 5.6 | 0.757 |
| limonene | 1029.7 | 5.0 ± 3.0 | 3.4 ± 1.8 | 0.374 |
| trans-β-ocimene | 1046.9 | 0.1 ± 0.08 | 1.2 ± 0.3 | 0.001* |
| γ-terpinolene | 1089.3 | 0.6 ± 0.3 | 0.4 ± 0.2 | 0.721 |
| linalool | 1097.6 | 0.1 ± 0.03 | 0.5 ± 0.1 | 0.001* |
| DMNT | 1114.1 | 0.6 ± 0.3 | 1.0 ± 0.4 | 0.221 |
| MeSA | 1198.8 | 37.6 ± 11.1 | 144.2 ± 56.8 | 0.001* |
| δ-elemeneA | 1338.6 | 0.9 ± 0.3 | 1.3 ± 0.4 | 0.341 |
| α-cubebene | 1353.6 | 0.01 ± 0.006 | 0.04 ± 0.02 | 0.577 |
| α-copaene | 1380.0 | 2.7 ± 1.4 | 3.2 ± 1.0 | 0.597 |
| β-elemeneA | 1393.6 | 1.4 ± 0.6 | 1.7 ± 0.5 | 0.634 |
| longifoleneA | 1415.7 | 0.8 ± 0.2 | 1.2 ± 0.3 | 0.644 |
| β-caryophyllene | 1429.6 | 2.6 ± 0.6 | 3.8 ± 0.8 | 0.224 |
| α-gurjuneneA | 1434.2 | 3.3 ± 1.6 | 4.5 ± 2.1 | 0.610 |
| β-farnesene | 1450.8 | 0.2 ± 0.1 | 0.2 ± 0.05 | 0.255 |
| α-humulene | 1462.8 | 2.1 ± 1.1 | 2.1 ± 1.4 | 0.731 |
| γ-muuroleneA | 1477.5 | 1.0 ± 0.3 | 1.0 ± 0.2 | 0.733 |
| α-muuroleneA | 1499.3 | 3.0 ± 1.2 | 2.8 ± 1.6 | 0.362 |
| tert-butylphenolA | 1500.9 | 6.1 ± 2.6 | 8.0 ± 2.4 | 0.851 |
| cis-nerolidol | 1527.7 | 0.3 ± 0.07 | 0.4 ± 0.1 | 0.277 |
| Unk. sesquiterpene AA | 1538.3 | 3.5 ± 1.7 | 6.2 ± 2.4 | 0.102 |
| Unk. sesquiterpene BA | 1551.4 | 2.5 ± 1.1 | 3.9 ± 1.6 | 0.598 |
| trans-nerolidol | 1560.0 | 0.4 ± 0.05 | 0.9 ± 0.2 | 0.004* |
| TMTT | 1572.9 | 342.9 ± 170.1 | 690.0 ± 218.5 | 0.050* |
| cis,cis-farnesolA | 1720.7 | 1.4 ± 0.7 | 1.9 ± 0.6 | 0.360 |
Compounds in the table are ordered according to their calculated Kovats index (IK). The compounds marked with A were not available as pure standards and therefore the amounts for these compounds have been estimated on the basis of the nearest compound on the RT-scale of the GC-spectrum, provided this compound was of the same chemical class and a pure standard was available. The values indicate the means and ses of each treatment group. The P-values have been calculated per compound with one-way ANOVA (df = 1) on the total amount produced per plant in 5 d (n = 9). The compounds that are marked with an asterisk (*) tested significantly different (F ≥ 7.2/P ≤ 0.05) for infested plants versus control plants.