Fig. 6

The expression level of 11 randomly selected PbrPUB genes in four abiotic stresses. a For dehydration treatment, the shoots were placed on dry filter papers for 0, 1, 6, 9, 12 and 24 h; b For cold stress, the seedlings were placed in the chamber set at 4 °C for 0, 1, 6, 9, 12, 24, 48 and 96 h; c For salt stress, the seedlings were placed in solution containing 200 mM NaCl solution for 0, 2, 4, 6, 8, 12 and 36 h; d For ABA stress, The seedlings were dipped in solution containing 100 μM ABA for 0, 1, 3, 6, 9, 12 and 36 h. The x-axes represented time after treatment; the y-axes represented the relatively expression of PbrPUB genes