The Class I HD-ZIP transcription factor PagHB7a functions as a positive regulator of salt tolerance in <i>Populus</i>.

PagNAC072 [ 66 ] and PagLEA [ 67 ] , which were key genes involved in osmoregulation and ion homeostasis, also exhibited a consistent upregulation trend in PagHB7a-OE plants, further supporting the coordinated activation of the stress response network, even though these changes did not reach statistical significance ( Fig. 5f ).

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