Figure 6: Differentially expressed genes involved in terpenoid biosynthesis in response to cold stress.

(a) Heat map of changes of transcript abundance for eight genes. (b) qRT-PCR determination of transcript levels of these genes in leaves and roots following cold treatment (4 °C). Three measurements were averaged from the results of three replicated experiments and statistically treated using a t-test. *P ≤ 0.05 > 0.005; **P ≤ 0.005 < 0.001; ***P < 0.001. L, leaves. R, roots.