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Background <p>The homeodomain-leucine zipper (<i>HD-Zip</i>) transcription factors play crucial roles in plant growth and development or in response to various abiotic stresses.</p> Results <p>In our research, fifty-eight <i>HD-Zip</i> genes were identified in tea plant, namely <i>CsHDZ01</i>-<i>58</i> and divided into four subfamilies, I-IV. All the CsHDZ proteins of four subfamilies harbored HD and LZ domains. Subfamily II CsHDZs contained two additional motifs, EAR and CPSCE. Two extra characteristic domains, START and SAD, were included in subfamily III and IV CsHDZs. While MEKHLA domain was distinctive in subfamily III members. All the subfamily III <i>CsHDZ</i>s were predicted to be targets of csn-miR166. A total of 24 duplicated <i>CsHDZ</i> gene pairs were identified and generated by segmental duplication in tea plant. The expression analysis indicated that most subfamily IV <i>CsHDZ</i> genes were expressed at high level in apical bud, and most subfamily III <i>CsHDZs</i> were high-expressed in stem. <i>CsHDZ</i> family genes exibited diverse expression profiles under cold, drought and salt stresses respectively. It implied that <i>CsHDZ</i> gene family may participate in regulating the response to various abiotic stresses in tea plant.</p> Conclusion <p>These results will provide an important foundation for further exploring the function and molecular mechanism of <i>HD-Zip</i> genes in response to various abiotic stresses in tea plant.</p>

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Domain characteristics, classification and expression profiles in response to various abiotic stresses of four HD-Zip subfamilies in tea plant

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年6月3日

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  • Xiaowen Luo,
  • Jiao Lu,
  • Yunye Li,
  • Xinfu Zhang,
  • Liping Gao,
  • Tao Xia,
  • Yahui Han

摘要

Background

The homeodomain-leucine zipper (HD-Zip) transcription factors play crucial roles in plant growth and development or in response to various abiotic stresses.

Results

In our research, fifty-eight HD-Zip genes were identified in tea plant, namely CsHDZ01-58 and divided into four subfamilies, I-IV. All the CsHDZ proteins of four subfamilies harbored HD and LZ domains. Subfamily II CsHDZs contained two additional motifs, EAR and CPSCE. Two extra characteristic domains, START and SAD, were included in subfamily III and IV CsHDZs. While MEKHLA domain was distinctive in subfamily III members. All the subfamily III CsHDZs were predicted to be targets of csn-miR166. A total of 24 duplicated CsHDZ gene pairs were identified and generated by segmental duplication in tea plant. The expression analysis indicated that most subfamily IV CsHDZ genes were expressed at high level in apical bud, and most subfamily III CsHDZs were high-expressed in stem. CsHDZ family genes exibited diverse expression profiles under cold, drought and salt stresses respectively. It implied that CsHDZ gene family may participate in regulating the response to various abiotic stresses in tea plant.

Conclusion

These results will provide an important foundation for further exploring the function and molecular mechanism of HD-Zip genes in response to various abiotic stresses in tea plant.