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Histochemical staining of poplar leaves. The genetically identical poplar seedlings were treated with water (control) and 150 mM NaCl for 24 h, followed by the histochemical staining of DAB and NBT, respectively. TL, transgenic poplar overexpressing ERF76 gene; WT, wild type poplar. The staining of WT is deeper than that of TL under salt stress condition.
