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Interaction between BZR1 and EIN3 mediates signalling crosstalk between brassinosteroids and ethylene
Na Zhao1, Min Zhao1, Yanchen Tian1
1The Key Laboratory of Plant Development and Environmental Adaptation Biology, Ministry of Education, School of Life Science, Shandong University, Qingdao, 266237, China.
The New Phytologist
|August 27, 2021
Summary
Brassinosteroid (BR) and ethylene (ET) signaling pathways interact to control plant growth. Master regulators BRASSINOZALE-RESISTANT1 (BZR1) and ETHYLENE INSENSITIVE3 (EIN3) directly bind, coordinating development.
Area of Science:
- Plant Biology
- Molecular Plant Science
- Developmental Biology
Background:
- Plant development relies on integrating environmental and internal signals.
- Brassinosteroid (BR) and ethylene (ET) signaling pathways share overlapping roles in plant growth.
- The precise relationship between BR and ET signaling pathways was previously unclear.
Purpose of the Study:
- To elucidate the molecular mechanism connecting BR and ET signaling pathways in plant development.
- To investigate the interaction between key transcription factors in BR and ET pathways.
- To understand the role of gibberellin (GA) in BR-mediated plant development.
Main Methods:
- Genetic analysis of plant mutants to dissect signaling pathways.
- Biochemical assays to confirm protein-protein interactions.
- Gene expression analysis to quantify the effects of signaling pathway crosstalk.
Main Results:
- BR and ET signaling pathways interact to promote apical hook development and cell elongation.
- BRASSINOZALE-RESISTANT1 (BZR1) directly interacts with ETHYLENE INSENSITIVE3 (EIN3) to co-regulate gene expression.
- BR-promoted development requires gibberellin (GA), which activates EIN3/EIL1 in BR-deficient plants.
Conclusions:
- BR and ET signaling pathways are interdependent, with BZR1 and EIN3 acting as crucial integrators.
- The interaction between BZR1 and EIN3 is essential for regulating genes involved in plant morphogenesis.
- GA acts as a critical component in the BR signaling pathway, influencing plant development through EIN3/EIL1 activation.
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