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Reference Detail
| Reference | ||
|---|---|---|
| Author | Guo T., Lu Z.Q., Shan J.X., Ye W.W., Dong N.Q., Lin H.X. | |
| Title | <i>ERECTA1</i> Acts Upstream of the OsMKKK10-OsMKK4-OsMPK6 Cascade to Control spikelet number by Regulating Cytokinin Metabolism in Rice. | |
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Abstract: grain number is a flexible trait that strongly contributes to grain yield. In rice (<i>Oryza sativa</i>), the OsMKKK10-OsMKK4-OsMPK6 cascade, which is negatively regulated by the dual-specificity phosphatase GSN1, coordinates the trade-off between grain number and grain size. However, the specific components upstream and downstream of the GSN1-MAPK module that regulate spikelet number per panicle remain obscure. Here, we report that ERECTA1 (OsER1), a negative regulator of spikelet number per panicle, acts upstream of the OsMKKK10-OsMKK4-OsMPK6 cascade and that the OsER1-OsMKKK10-OsMKK4-OsMPK6 pathway is required to maintain cytokinin homeostasis. OsMPK6 directly interacts with and phosphorylates the zinc finger transcription factor DST to enhance its transcriptional activation of <i>CYTOKININ OXIDASE2</i> (<i>OsCKX2</i>), indicating that the OsER1-OsMKKK10-OsMKK4-OsMPK6 pathway shapes panicle morphology by regulating Cytokinin Metabolism. Furthermore, overexpression of either <i>DST</i> or <i>OsCKX2</i> rescued the spikelet number phenotype of the <i>OsER1</i>, <i>osmkkk10</i>, <i>OsMKK4</i>, and <i>OsMPK6</i> mutants, suggesting that the DST-OsCKX2 module genetically functions downstream of the OsER1-OsMKKK10-OsMKK4-OsMPK6 pathway. These findings reveal specific crosstalk between a MAPK signaling pathway and Cytokinin Metabolism, shedding light on how developmental signals modulate phytohormone homeostasis to shape the inflorescence. |
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| Journal | Plant Cell | |
| Country | China | |
| Volume | 32(9) | |
| Pages | 2763-2779 | |
| Year | 2020 | |
| PubMed ID | 32616661 | |
| PubMed Central ID | 7474279 | |
| DOI | 10.1105/tpc.20.00351 | |
| URL | - | |
| Relation | ||
| Gene | DSG1 DST GN1A GSN1 MSRMK2 RLCK204 SMG1 SMG2 | |
| 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 | - | |
