Genome-Wide Identification and Evolutionary Analysis of the <i>SnRK2</i> Gene Family in <i>Nicotiana</i> Species
Soil salinization threatens agriculture by inducing osmotic stress, ion toxicity, and oxidative damage. <i>SnRK2</i> 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...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-06-01
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| Series: | Agriculture |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2077-0472/15/13/1396 |
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| Summary: | Soil salinization threatens agriculture by inducing osmotic stress, ion toxicity, and oxidative damage. <i>SnRK2</i> 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 <i>SnRK2</i> genes across four <i>Nicotiana</i> species (<i>N. tabacum</i>, <i>N. benthamiana</i>, <i>N. sylvestris</i>, and <i>N. tomentosiformis</i>). Phylogenetic reconstruction clustered these genes into five divergent groups, revealing lineage-specific expansion in diploid progenitors <i>(N. tomentosiformis</i>) versus polyploidy-driven gene loss in <i>N. tabacum</i>. 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 <i>SnRK2</i> evolution in <i>Nicotiana</i>, offering a foundation for engineering salt-tolerant crops. |
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| ISSN: | 2077-0472 |