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Reference Detail
| Reference | ||
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| Author | Du H., Yong R., Zhang J., Cai G., Wang R., Li J., Wang Y., Zhang H., Gao X., Huang J. | |
| Title | osbak2/OsSERK2 Expression is Repressed by OsBZR1 to Modulate Brassinosteroid Response and Grain Length in Rice. | |
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Abstract: Brassinosteroids (BRs) are a class of polyhydroxylated steroidal phytohormones and essential for plant growth and development. Rice BRASSINOSTEROID-INSENSITIVE1 (BRI1)-ASSOCIATED RECEPTOR KINASES (OsBAKs) are plasma membrane (PM)-localized receptor kinases, belonging to the subfamily of leucine-rich repeat (LRR) receptor kinases. In Arabidopsis, BRs induce the formation of BRI1-BAK1 heterodimer complex and transmit the signal cascade to the BRASSINAZOLE RESISTANT1/BRI1-EMS-SUPPRESSOR1 (BZR1/BES1) to regulate BR signaling. In rice, we found that OsBZR1 binds directly to the promoter of osbak2, not OsBAK1, and represses the expression of osbak2 to form a BR feedback inhibition loop. Additionally, the phosphorylation of OsBZR1 by OsGSK3 reduced its binding activity to osbak2 promoter. The osbak2 displays a typical BR deficient phenotype and negatively modulates the accumulation of OsBZR1. Interestingly, the grain length of osbak2 mutant was increased whereas the cr-osbak2/cr-OsBZR1 double mutant restored the reduced grain length of cr-OsBZR1 mutant, implying that the increased grain length of osbak2 may be due to the rice SERKs-dependent pathway. Our study reveals a novel mechanism of osbak2 and OsBZR1 engaging in a negative feedback loop to maintain rice BR homeostasis, facilitating to a deeper understanding of BR signaling network and grain length regulation in rice. |
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| Journal | J. Exp. Bot. | |
| Country | China | |
| Volume | ||
| Pages | ||
| Year | 2023 | |
| PubMed ID | 37235693 | |
| PubMed Central ID | - | |
| DOI | 10.1093/jxb/erad196 | |
| URL | - | |
| Relation | ||
| Gene | BZR1 GSK4 SERK1 | |
| 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 | - | |
