To examine the physiological parameters of NT poplar and PeHKT1;1 transgenic lines, the three-year-old soil-grown poplar plants were treated with 0.8% (w/v) NaCl at different time points (0, 0.5, 1, 1.5, 2, and 6 h). The CAT, SOD, and POD activities were measured by leaves according to Li et al. [29 (link)] using the corresponding assay kits: total protein assay kit (BCA method, A045-2), catalase assay kit (visible light, A007-1), total superoxide dismutase (T-SOD) assay kit (hydroxylamine method, A001-1), and peroxidase assay kit (A084-3), according to the manufacturer’s respective manuals (Jiancheng Bioengineering Inc., Nanjing, China). The experiments were repeated at least five times. Statistical analyses were performed using SPSS 21.0 software (SPSS Inc., Chicago, IL, USA). Data were compared using one-way analysis of variance (ANOVA) followed by Duncan’s test.
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