Fig. 3

The relative expression of reference genes for trichome-regulating transcription factors A: HlETC1, B: HlCPC, C: HlMYB61, D: HlMYB5, E: HlGL2, F: HlCYCB2–4, G: HlHDG2, H: HlPDF2, I: HlHB51, J: HlZHD6, K: HlHB14, L: HlCYCNB1, M: HlHDG11, N: HlZFP4, O: HlZFP5, P: HlZFP6 Q: HlZFP8, R: HlGIS3, S: HlYABBY1, T: HlMYB106, U: HlWRKY44, V: HlGL3, W: HlRAV1, X: HlABIL2 and Y: HlABIL3 (see Table 1) in different tissues of aromatic and bitter hop cultivars. Tissues: A – apex, B – leaf, C – bract without lupulin, D – flower, E – young cone, and F – lupulin gland. Significant t-test group differences at the following probability levels: * - P < 0,1, ** - P < 0,05, and *** - P < 0,01. straight line - median, dashed line – average, and box – 95% percentile ± standard deviation