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SlARF11-SlGATA5 stimulates tomato leaf angle by feedback regulation with brassinosteroid signaling
Qihui Wang1, Ruoxuan Wang1, Xi Wang1
1College of Horticulture, Shenyang Agricultural University, Shenyang, 110866, China.
Journal of Integrative Plant Biology
|March 13, 2026
Summary
Auxin response factor 11 (SlARF11) regulates tomato leaf angle by interacting with SlGATA5, linking auxin and brassinosteroid (BR) signaling pathways. This pathway involves cell elongation and lignin deposition, influencing plant architecture.
Area of Science:
- Plant Biology
- Molecular Plant Science
- Plant Development
Background:
- Auxin response factors (ARFs) and brassinosteroids (BRs) are crucial for plant growth and development, including leaf angle determination.
- The intricate relationship between ARFs and BR signaling in regulating tomato leaf angle is not fully understood.
Purpose of the Study:
- To elucidate the role of auxin-responsive factor 11 (SlARF11) in tomato leaf angle regulation.
- To investigate the crosstalk between ARF and BR signaling pathways in tomato.
Main Methods:
- Investigated the interaction between SlARF11 and SlGATA5.
- Analyzed the regulation of BR signaling components, including SlBIN2.1 and SlBES1.
- Examined the effects on cell elongation and lignin deposition at the petiole base.
Main Results:
- SlARF11 positively regulates tomato leaf angle and shows hypersensitivity to BR.
- SlARF11 interacts with SlGATA5, which negatively regulates BR signaling by inhibiting SlBIN2.1 expression.
- SlBIN2.1 phosphorylates SlARF11, enhancing SlARF11-SlGATA5 interaction, while SlBES1 inhibits SlARF11 expression.
Conclusions:
- A novel SlARF11-mediated signaling pathway links ARFs to the BR signaling pathway in tomato.
- This pathway is crucial for regulating tomato leaf angle through cell elongation and lignin deposition.
- Findings reveal significant crosstalk between auxin response and BR signaling in controlling plant architecture.
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