Figure 4. Heat map using normalized counts which show patterns of expression in hsp genes for the heat-tolerant B. calyciflorus s.s. (A), and the heat-sensitive B. fernandoi (B). Blue color (C) represents control treatment, orange color (M) represents mild heat treatment, and red color (H) represents high heat treatment. The symbols indicate the pairwise comparison in which differential gene expression (DE) was significant (p<0.05). The color key represents a spectrum of lowest gene expression (blue) to highest gene expression (red).