Representation of the β-oxidation pathway: variations in the expression levels of the genes coding for the key enzymes. The four treatment conditions, grouped by genotypes, are plotted on x axis. The relative expression level (data normalized to the median for each probe set) is plotted on the y axis. ACS: acyl-CoA synthase (EC 18.104.22.168); ACX: acyl-CoA oxidase (EC 22.214.171.124); Catalase: peroxisome catalase (EC 126.96.36.199); ECH: enoyl-CoA hydratase (EC 188.8.131.52); HCD: L-β-hydroxyacyl-CoA dehydrogenase (EC 184.108.40.206); AAT: acyl-CoA-acetyltransferase enzyme or thiolase (EC 220.127.116.11). CT = Control samples; DS = Drought stressed samples; HS = Heat stressed samples; CS = Combined stress samples.