Table 3. Transcriptional regulation of flavonoids and alkaloids biosynthetic genes upon OG treatment. Quantitative RT-qPCR analysis of PAL, CHS1.1, CHI1.1 (Flavonoid biosynthesis genes) and PMT (Alkaloid biosynthesis gene) confirms upregulation of such metabolic pathways in roots in response to OGs treatments. Numbers correspond to the fold induction of the gene expression levels in treated vs control plants (n = 6 from six biological replicates). Values are normalized relative to the tomato housekeeping gene Actin. Bold numbers indicate significant differences (t-test; p-value<0.05).