Fig. 5.

Expression profiles of 18 Populus WRKY genes under different treatments. Leaves excised from poplar were sprayed with SA and MeJA, inoculated with M. brunnea f.sp. multigermtubi, and treated with wounding, cold, and salinity stresses. The untreated leaves were regarded as the control (CK). Leaves were collected for transcript profile analysis by qRT-PCR. Error bars result from three biological replicates. Poplar 18S expression was used as a control and gene-specific primers were used for qRT-PCR analysis of Populus WRKY genes.