Figure 3.

Differential metabolites detected between the thermotolerant and thermosensitive lettuce cultivars. Note: The heatmap indicates the differential metabolites extracted from raw S15k0106 (N106) and S13k0062 (N62) seeds and germinated buds of S15k0106 (C106) and S13k0062 (C62) seeds. A red box means that most of the metabolites in this class had higher relative abundances in a treatment than those in another in a pair of comparison (N106 vs. N62 or C106 vs. C62), while a blue box represents that relative abundances of most of the metabolites in this class were lower in a treatment than those in another between the two treatments; a gray box denotes no significance between two treatments.