Genome-Wide Identification of the SMXL Gene Family in Common Wheat and Expression Analysis of TaSMXLs Under Abiotic Stress
Strigolactones (SLs), a novel class of plant hormones, play a crucial role in plant growth and development. <i>SMXL</i> (<i>SUPPRESSOR OF MAX2 1-like</i>) is a key gene in the SL signaling pathway, regulating its function by inhibiting the reception of SL signals. Therefore,...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-03-01
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| Series: | Agronomy |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2073-4395/15/3/656 |
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| Summary: | Strigolactones (SLs), a novel class of plant hormones, play a crucial role in plant growth and development. <i>SMXL</i> (<i>SUPPRESSOR OF MAX2 1-like</i>) is a key gene in the SL signaling pathway, regulating its function by inhibiting the reception of SL signals. Therefore, investigating how <i>SMXL</i> regulates SL to influence wheat growth, development, and stress resistance is of significant importance. In this study, 22 <i>SMXL</i> genes were identified in the Chinese Spring wheat reference genome. Bioinformatics analysis revealed that these genes belong to the Group II subfamily, exhibiting similar physicochemical properties and conserved motifs. Ka/Ks analysis indicated that these genes have undergone purifying selection during evolution. Cis-acting element analysis showed that the promoter regions of <i>TaSMXL</i> genes are enriched with light-responsive elements and regulatory elements related to growth, development, and stress responses. Expression pattern analysis demonstrated that <i>TaSMXL</i> genes exhibit significant differential expression under drought, salt, and cold stress conditions, revealing the potential molecular mechanisms of wheat’s response to multiple abiotic stresses. This study provides a theoretical foundation for understanding the functional roles of <i>SMXL</i> genes in wheat and offers valuable candidate gene resources for breeding stress-resistant wheat varieties. |
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| ISSN: | 2073-4395 |