Fig. 6From: Anthocyanin accumulation correlates with hormones in the fruit skin of ‘Red Delicious’ and its four generation bud sport mutantsRelationships between total anthocyanin contents and transcript levels of the sixteen representative genes from Figs. 4 and 5. For each accession, the expression was determined in three developmental stages (S1 to S3) of fruit skin tissues. For the qRT-PCR assay, the mean was calculated from three biological replicates, each with three technical replicates (n=9). These replicates were then normalized relative to the expression of MdGADPH. The x-axis in each chart is the same and represents different Malus accessions, as indicated by names in the bottom panel, which are arranged in different clusters. The left y-axis represents relative expression levels determined by qRT-PCRBack to article page