Journal
PLANT SCIENCE
Volume 311, Issue -, Pages -Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.plantsci.2021.111021
Keywords
Poplar; HD-Zip family; Gene expression; Salt tolerance; Growth and physiological traits
Categories
Funding
- Fundamental Research Funds for the Central Universities [2572018CL03]
- 111 Project [B16010]
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This study identified and classified 63 poplar HD-Zip transcription factors, and found the important role of PsnHDZ63 in plant salt tolerance through expression pattern analysis under salt stress. The phylogenetic relationships among these members and the collinear evolutionary relationships were revealed based on gene structure analysis.
HD-Zip is a plant-specific HB transcription factor, which participates in plant development and stress response. In this study, we identified 63 poplar HD-Zip transcription factors, which were randomly distributed on 19 chromosomes of poplar. Based on the gene structure and phylogenetic relationship, these members are divided into four groups, which have a variety of collinear evolutionary relationships. They also have rich segmental replication events and experienced strong purification selection. Based on RNA-seq analysis, we profiled the expression pattern of the 63 HD-Zip members under salt stress. Subsequently, we carried out in-depth study on the significantly up-regulated PsnHDZ63 in the stems and leaves. The transgenic Populus simonii x P.nigra plants over-expressing PsnHDZ63 displayed better morphological and physiological indexes than WT under salt stress. In addition, PsnHDZ63 enhanced salt stress tolerance of transgenic lines by combining effective stress-resistant elements to improve reactive oxygen species scavenging ability. These studies laid a foundation for a comprehensive understanding of poplar HD-Zip family members, and revealed the important role of PsnHDZ63 in plant salt tolerance.
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