Figure 6

The transcript abundance of (a) PaCHS1, (b) PaCHS4, (c) PaFLS1 and (d) PaFLS2 in leaf of Populus alba under Salt, UV-B radiation and UV-B&Salt treatment for different treatment duration. 0 h, 1 h, 2 h, 4 h, 6 h and 8 h means the UV-B radiation and salt treatment duration was 0 h, 1 h, 2 h, 4 h, 6 h and 8 h respectively, 12 h and 16 h means 8 h treatment duration (UV-B) in the first day plus the another 4 h and 8 h treatment duration separately in the second day. The transcript abundance in the control treatment (0 h) was set at 1. Data shown are the average mean ± SE of three replicates (n = 3). Different asterisks indicated statistical significance among different treatment duration according to Tukey’s test, * in present at the P < 0.05 level, ** in present at the P < 0.01 level.