Figure legends

Figure 1. Total terpenoid contents in xylem sap (A), total terpenoid emissions (B) and total terpenoid contents in different tissues (C) as well as terpenoid composition in xylem sap (D), of emissions (E), and in different tissues (F) of Norway spruce trees. Data are means ± SE of at least five biological replicates each. MT, monoterpenes; MT-O, oxygenated monoterpenoids; SQT, sesquiterpenes; SQT-O, oxygenated sesquiterpenoids; DT, diterpenes; DT-O, oxygenated diterpenoids. Different letters indicate significant difference at p<0.05 by ANOVA on ranks.
Figure 2. Emission rates (A), and contents/concentrations of the 16 most abundant oxygenated monoterpenoids in current-year needles (B), xylem sap (C), bark (D), wood (E), and roots (F) of Norway spruce trees. Data are means ± SE of at least five biological replicates. All compounds emitted but under-represented in needles are highlighted in blue.
Figure 3. Emission rates (A), and contents/concentrations of the 10 most abundant monoterpenes in current-year needles (B), xylem sap (C), bark (D), wood (E), and roots (F) of Norway spruce trees. Data are means ± SE of at least five biological replicates. All compounds emitted but not present in needles are highlighted in blue.
Figure 4. Emission rates (A), and contents/concentrations of the 11 most abundant sesquiterpenes in current-year needles (B), xylem sap (C), bark (D), wood (E), and roots (F) of Norway spruce trees. Data are means ± SE of at least five biological replicates. All compounds emitted but absent or under-represented in needles are highlighted in blue.
Figure 5. Emission rates (A), and contents/concentrations of the 8 most abundant oxygenated sesquiterpenoids in current-year needles (B), xylem sap (C), bark (D), wood (E), and roots (F) of Norway spruce trees. Data are means ± SE of at least five biological replicates. All compounds emitted but under-represented in needles are highlighted in blue.
Figure 6. Score plot of a partial least-square discriminant analysis (PLS-DA) of the terpenoid contents in xylem sap, bark, wood, current-year needles and roots of Norway spruce under natural condition in 2015. The loading plot, which indicates the terpenoids that are responsible for the sample distribution in the score plot, is given in Figure S1 available as Supplementary Data at Plant Cell and Environment online.
Figure 7. Venn plot indicating the numbers of terpenoids present in roots, bark, wood and xylem sap of Norway spruce (graph drawn online:http://bioinformatics.psb.ugent.be/webtools/Venn/and the specific compounds were shown in Table S3).
Figure 8. Venn plot indicating the numbers of terpenoids present in needles, emissions and xylem sap of spruce (graph drawn online:http://bioinformatics.psb.ugent.be/webtools/Venn/and the specific compounds were shown in Table S4).