Table 2.

Ranking of the 10 NVSCs that best distinguish the blends of the control and herbivory treatments as determined by the RF analysis. The subclass of the individual compounds resulting from the feature-based molecular networking analysis is listed for each NVSC. The compounds are listed in descending order based on decrease in variable importance (E).

Rank	ID	NVSC subclass	E
1	226↑	Fatty acyl glycosides	137.51
2	81↑	Terpene glycosides1	93.44
3	136↑	NA	77.57
4	133↑	1-Hydroxy-2-unsubstituted benzenoids1	74.69
5	84↓	NA	63.58
6	127↑	Fatty acyl glycosides2	63.28
7	104↓	Carbohydrates and carbohydrate conjugates	61.24
8	97↑	Fatty acyl glycosides	57. 14
9	58↓	Fatty acyl glycosides	50.34
10	211↑	Terpene glycosides1	48.03

Arrows beside ID numbers indicate the direction of the herbivory effect (↑: increase; ↓: decrease). The tandem mass spectra (MS/MS) of the 10 NVSCs are given in Figure S7, and details of the class, subclass and identity of each NVSC are shown in Table S5, both available as Supplementary data at Tree Physiology Online. NA: not available metabolite annotation/identification within the molecular network.

¹Identified via SIRIUS.

²Tentatively identified as 7-epi-12-hydroxyjasmonic acid glucoside.