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(a) Genomic DNA-level detection. (b) The expression level of PeMKK2a in eight transgenic lines and the CK, according to qRT-PCR (CK, non-transgenic poplar; T2, T4, T21, T27, T30, T37, T46, and T52, transgenic lines). (c) Phenotypic observations of transgenic plants under salt stress. (Unstressed poplar plants constituted the positive control. All the treatments included three biological replicates).
