Genome-Wide Identification of WRKY Transcription Factor Family and Its Expression Patterns in <i>Dalbergia odorifera</i> T. Chen
2023
Qing Zhu | Feifei Chen | Xu Hu | Haoyue Zheng | Yi Liu | Chunchan Fu | Shangqian Xie | Dunxi Li | Minqiang Tang
<i>Dalbergia odorifera</i> is a valuable material used in the crafting of luxury furniture, and the chemical constituents from heartwood possess significant medicinal value. The WRKY gene family, one of the most extensively studied gene families, plays an important role in plants. However, a comprehensive genome-wide identification of the WRKY gene family in <i>D. odorifera</i> has not been reported yet. In this study, a total of 99 WRKY genes were identified in <i>D. odorifera</i>. The DoWRKY genes were categorized into three primary groups with five subgroups. A collinearity analysis revealed 38 segmental duplications and 3 tandem duplications within the DoWRKY genes, indicating the pivotal role of segmental duplication in gene family expansion. Through the analysis of DoWRKY transcriptomic data across diverse tissues and under wounding stress, we found that only eight genes were universally expressed, while a subset displayed distinct tissue-specific patterns. Notably, <i>DoWRKY41</i> was exclusively expressed in leaves; <i>DoWRKY04</i> was solely in roots; and <i>DoWRKY17</i>, <i>DoWRKY28</i>, <i>DoWRKY47</i>, and <i>DoWRKY67</i> were uniquely in flowers. Furthermore, we identified 24 WRKY proteins that tightly respond to wounding stress (20 upregulated; 4 downregulated). This comprehensive investigation offered valuable insights into the WRKY gene family of <i>D. odorifera</i>, serving as a foundational resource for forthcoming explorations into the functional roles of these genes amid wounding stress.
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