OsWRKY18 , a WRKY transcription factor, is involved in rice salt tolerance

作者：Liyun Peng, Dong Chao, Xiaoqian Sun, Longying Li, Jinyu Yu, Ziheng Li, Baolei Zhang, Chunping Liu, Shan Fu, Zhufeng Chen, Jixing Xia · 发表于：Plant and Cell Physiology · 年份：2025 · DOI：10.1093/pcp/pcaf063 · 被引用次数：10 · 研究领域：Plant Gene Expression Analysis、Plant Stress Responses and Tolerance、Plant Molecular Biology Research

Salinity stress significantly impairs plant growth and leads to substantial yield losses in rice and other crops. WRKY transcription factors (TFs) are well-documented regulators of plant stress responses, yet their specific roles in rice salt tolerance remain largely unexplored. This study investigates the function of OsWRKY18, a rice WRKY TF with transcriptional activation activity, in salt stress adaptation. Bioinformatics analysis revealed that OsWRKY18 contains conserved motifs and domains shared with other salt-tolerant WRKY TFs, indicating its potential involvement in stress response. Expression analysis showed that OsWRKY18 is predominantly expressed in roots, with significant upregulation under salt stress. Subcellular localization in rice protoplasts revealed that OsWRKY18 is primarily localized in the nucleus. Immunostaining assays confirmed its widespread expression in root tissues, particularly in the stele, but not in epidermal cells. Using CRISPR/Cas9, we generated Oswrky18 knockout mutants, which displayed increased salt sensitivity, marked by elevated Na+ accumulation in shoots and stunted growth compared to wild-type plants. Transcriptome sequencing and quantitative real-time PCR analysis revealed that OsWRKY18 regulates key genes involved in ABA signaling, osmotic adjustment, and ion homeostasis, including OsHOX22, OsSALP1, OsNHX4, and OsHKT1;5. Yeast one-hybrid assays further confirmed the direct binding of OsWRKY18 to the OsHKT1;5 promoter. These results h...