Genome-Wide Identification and Evolutionary Analysis of the SnRK2 Gene Family in Nicotiana Species

Yu Tang, Yangxin Zhang, Zhengrong Hu, Xuebing Yan, Risheng Hu and Jibiao Fan ()
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Yu Tang: College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, China
Yangxin Zhang: College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, China
Zhengrong Hu: Hunan Tobacco Research Institute, Changsha 410004, China
Xuebing Yan: College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, China
Risheng Hu: Hunan Tobacco Research Institute, Changsha 410004, China
Jibiao Fan: College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, China

Agriculture, 2025, vol. 15, issue 13, 1-12

Abstract: Soil salinization threatens agriculture by inducing osmotic stress, ion toxicity, and oxidative damage. SnRK2 genes are involved in plant stress responses, but their roles in salt stress response regulation of tobacco remain unclear. Through genome-wide analysis, we identified 54 SnRK2 genes across four Nicotiana species ( N. tabacum , N. benthamiana , N. sylvestris , and N. tomentosiformis ). Phylogenetic reconstruction clustered these genes into five divergent groups, revealing lineage-specific expansion in diploid progenitors (N. tomentosiformis ) versus polyploidy-driven gene loss in N. tabacum . In silico promoter analysis uncovered regulatory networks involving light, hormones, stress, and developmental signals, with prevalent ABA-responsive elements (ABREs) supporting conserved stress-adaptive roles. Structural analysis highlighted functional diversification through variations in intron–exon architecture and conserved kinase motifs. This study provides a genomic atlas of SnRK2 evolution in Nicotiana , offering a foundation for engineering salt-tolerant crops.

Keywords: SnRK2; gene family evolution; comparative genomics; Nicotiana; salt stress (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2025
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