Expression patterns of SlSR genes in different tissues and during fruit development. Transcription levels of SlSRs were investigated by RT-qPCR. Relative gene expression levels (highest value = 100%) are shown after normalization with actin transcript values. Error bars represent standard error of the mean. For each gene, different letters indicate significant differences among mean values (P < 0.05; t-test). Numbers on the x-axis represent the following: two-week old seedling leaves (1) and roots (2), flowers (3), fruit at 10, 20, 30, and 35 DPA (4-7), and fruit at the mature green, breaker, turning, pink and red stages (8-12). The RT-qPCR analyses were repeated at least three times in three independent experiments. Photos of fruit at the nine developmental stages assessed (4-12; 10 DPA to red ripe) are shown on the bottom right.