Abstract
WNK kinases are a unique class of serine/threonine protein kinases that lack a conserved catalytic lysine residue in the kinase domain, hence the name WNK (with no K, i.e., lysine). WNK kinases are involved in various physiological processes in plants, such as circadian rhythm, flowering time, and stress responses. In this study, we identified 26 WNK genes in soybean and analyzed their phylogenetic relationships, gene structures, chromosomal distribution, cis-regulatory elements, expression patterns, and conserved protein motifs. The soybean WNK genes were unevenly distributed on 15 chromosomes and underwent 21 segmental duplication events during evolution. We detected 14 types of cis-regulatory elements in the promoters of the WNK genes, indicating their potential involvement in different signaling pathways. The transcriptome database revealed tissue-specific and salt stress-responsive expression of WNK genes in soybean, the second of which was confirmed by salt treatments and qRT-PCR analysis. We found that most WNK genes were significantly up-regulated by salt stress within 3 h in both roots and leaves, except for WNK5, which showed a distinct expression pattern. Our findings provide valuable insights into the molecular characteristics and evolutionary history of the soybean WNK gene family and lay a foundation for further analysis of WNK gene functions in soybean.
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Funding
This work was supported by the National Natural Science Foundation of China (Grant No. 32301822), the China Postdoctoral Science Foundation (Grant No. 2022M720882), the Innovation Research Project of Coarse Cereals Specialty in Guizhou Province [2019[4012]], and the Regional First-class Discipline of Ecology in Guizhou Province (XKTJ[2020]22).
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BS and ZS conceived and designed the research. BS and ZS performed the experiments and collected the data. JW and YZ supervised the experiments. BS wrote the manuscript. FK and BL modified manuscript. TG polished the manuscript. FW and TF polished the images. All authors have read and agreed to the published version of the manuscript.
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Su, B., Ge, T., Zhang, Y. et al. Genome-wide identification and expression analysis of the WNK kinase gene family in soybean. Mol Breeding 44, 16 (2024). https://doi.org/10.1007/s11032-024-01440-5
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DOI: https://doi.org/10.1007/s11032-024-01440-5