Transcription factors are the regulatory proteins which activate or repress their target genes. We isolated homeodomain-leucine zipper III (PagHD-ZIP III_1) gene, a plant-specific transcription factor known to play crucial roles in plant development, from poplar (Populus alba × P. glandulosa). The PagHD-ZIP III_1 is 2,723 base pairs long and encodes a putative 838 amino acid protein with an expected molecular mass of 92.3 kDa. The PagHD-ZIP III_1 protein has four conserved regions including HD, bZIP, START and MEKHLA. Southern blot analysis indicated that PagHD-ZIP III_1 belong to a small gene family in the poplar genome. PagHD-ZIP III_1 is expressed highly in the stem. Moreover, the expression of PagHD-ZIP III_1 is induced by salt, cold, wounding and a plant hormone JA. Our results indicate that PagHD-ZIP III_1 is involved in abiotic stress response and hormonal signaling in poplar.

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• Genetic diversity andin vitroassessment of salt tolerance responses and associated changes in gene expression of male poplar (Populus) trees
  Salah Khattab, Hoda A. El-Garhy
  The Journal of Horticultural Science and Biotechnology.2016; 91(6): 551.     CrossRef
• Isolation and Characterization of a Putative SENESCENCE 1 Gene from Poplar (Populus alba × P. glandulosa)
  Joon-Hyeok Kim, Hyoshin Lee, Young-Im Choi, Eun-Kyung Bae, Seo-Kyung Yoon, Seol Ah Noh
  Korean Journal of Plant Resources.2014; 27(4): 392.     CrossRef