Figure 2.

Correlations among (a–f) different classes of volatile organic compounds (VOCs) emitted [pmol mm⁻¹] upon leaf wounding from leaves of five tropical crop species. Panels (g–k) show the outlines of leaves of studied species: (g) Abelmoschus esculentus, (h) Amaranthus cruentus, (i) Amaranthus hybridus, (j) Telfairia occidentalis, and (k) Solanum aethiopicum. Different symbols were used for different species. Abelmoschus esculentus data were excluded in correlation with LOX products and isoprenoids. Filled points with standard error bars are averages for each species. Linear correlations shown are all significant at p = 0.05. LOX products stands for volatile products of lipoxygenase pathway (also called green-leaf volatiles, typically C₅-C₆ aldehydes and alcohols, Table 1), and LOCs for low-weight oxygenated compounds (C₁-C₃ volatiles synthesized through diverse pathways, Table 1). Isoprenoids identification by GC-MS can be found in Table S1, Supplementary Materials.