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Reference Detail
| Reference | ||
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| Author | Chun Y., Fang J., Savelieva E.M., Lomin S.N., Shang J., Sun Y., ZHAO J., Kumar A., Yuan S., Yao X.F., Liu C.M., Arkhipov D.V., Romanov G.A., Li X. | |
| Title | The cytokinin receptor OHK4/OsHK4 regulates inflorescence architecture in rice via an IDEAL PLANT ARCHITECTURE1/WFP-mediated positive feedback circuit. | |
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Abstract: Inflorescence architecture is important for rice (Oryza sativa) grain yield. The phytohormone cytokinin (CK) has been shown to regulate rice inflorescence development; however, the underlying mechanism mediated by CK perception is still unclear. Employing a forward genetic approach, we isolated an inactive variant of the CK receptor OHK4/OsHK4 gene named panicle length1 (pal1), which shows decreased panicle size due to reduced inflorescence meristem activity. A 2-amino acid deletion in the long α-helix stalk of the sensory module of OHK4 impairs the homodimerization and ligand-binding capacity of the receptor, even though the residues do not touch the ligand-binding domain or the dimerization interface. This deletion impairs CK signaling that occurs through the type-B response regulator OsRR21, which acts downstream of OHK4 in controlling inflorescence size. Meanwhile, we found that IDEAL PLANT ARCHITECTURE1(IPA1)/WEALTHY FARMER'S PANICLE (WFP), encoding a positive regulator of inflorescence meristem development, acts downstream of CK signaling and is directly activated by OsRR21. Additionally, we revealed that IPA1/WFP directly binds to the OHK4 promoter and upregulates its expression through interactions with two TCP transcription factors, forming a positive feedback circuit. Altogether, we identified the OHK4-OsRR21-IPA1 regulatory module, providing important insights into the role of CK signaling in regulating rice inflorescence architecture. |
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| Journal | Plant Cell | |
| Country | unknown | |
| Volume | ||
| Pages | ||
| Year | 2023 | |
| PubMed ID | 37811656 | |
| PubMed Central ID | - | |
| DOI | 10.1093/plcell/koad257 | |
| URL | - | |
| Relation | ||
| Gene | PAL1 PCF1 PCF2 RR21 WFP | |
| INSD | - | |
| Strain | Wild Core Collection | - |
| Induced Mutation Lines(NIG Collection) | - | |
| Sterile Seed Strain | - | |
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Lethal Embryo Mutantion Strain |
- | |
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Stages in Each Organ - Muant Lines (Gene) |
- | |
| Cultivated Varieties(NIG Collection) | - | |
| Stages in Each Organ | - | |
