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| Reference | ||
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| Author | Chen R., Huang Q., Xu Y., Wang Z., Li N., Lu Y., Tao T., Hua Y., Wang G., Wang S., Wang H., Zhou Y., Xu Y., Li P., Xu C., Yang Z. | |
| Title | Comparative Genomic Analysis of the Poaceae Cytokinin Response Regulator <i>RRB</i> Gene Family and Functional Characterization of <i>OsRRB5</i> in Drought Stress Tolerance in Rice. | |
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Abstract: The cytokinin (CK) type B response regulator (<i>RRB</i>) gene is involved in the CK signaling pathway and performs a key function for mediating reactions to amounts of abiotic stresses. Nevertheless, the <i>RRB</i> gene family remains to be characterized in Poaceae (also known as Gramineae or grasses). Here, we performed a comprehensive analysis encompassing phylogenetic relationships, evolutionary pressures, and expression patterns of the <i>RRB</i> gene family in six Poaceae species, including rice, <i>Panicum</i>, <i>Sorghum</i>, <i>Setaria</i>, maize, and wheat. Phylogenetic tree and syntenic analyses revealed that the <i>RRB</i> genes were divided into seven orthologous gene clusters (OGCs), indicating that the common ancestor of these Poaceae species possessed at least seven <i>RRB</i> genes. Further analysis revealed that the evolution of the Poaceae <i>RRB</i> gene family was primarily driven by purifying selection. The expression pattern of rice <i>OsRRB</i> toward phytohormonal and abiotic stresses was also investigated. The findings revealed that several phytohormones, including cytokinin (CK), abscisic acid (ABA), and methyl jasmonate (MeJA), as well as abiotic factors such as drought and cold, significantly increased the expression levels of these genes. Importantly, haplotype analysis identified four crucial variation sites within the <i>OsRRB5</i> genomic regions that may contribute to drought resistance in rice. Our findings lay the groundwork for further elucidating the biological function of <i>OsRRB</i> genes and provide a promising new target for developing stress-resistant rice varieties. |
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| Journal | Int J Mol Sci | |
| Country | China | |
| Volume | 26(5) | |
| Pages | ||
| Year | 2025 | |
| PubMed ID | 40076580 | |
| PubMed Central ID | 11899991 | |
| DOI | 10.3390/ijms26051954 | |
| URL | - | |
| Relation | ||
| Gene | DLC1 HST1 RR21 RR23 RR25 RR26 | |
| INSD | - | |
| Strain | Wild Core Collection | - |
| Induced Mutation Lines(NIG Collection) | - | |
| Sterile Seed Strain | - | |
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Lethal Embryo Mutantion Strain |
- | |
|
Stages in Each Organ - Muant Lines (Gene) |
- | |
| Cultivated Varieties(NIG Collection) | - | |
| Stages in Each Organ | - | |
