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The polymerase-associated factor 1 complex modulates the growth-defense tradeoff in Arabidopsis
Yuyu Guo1,2,3,4,5, Cunliang Li1,2,3,4,5, Yao Liu1,2,3,4,5
1Hubei Hongshan Laboratory, Wuhan, 430070, China.
Science Advances
|September 26, 2025
Summary
The polymerase-associated factor 1 complex (PAF1C) in Arabidopsis represses defense genes, balancing plant growth and immunity. Disrupting PAF1C enhances disease resistance but stunts growth, revealing a key regulatory module.
Area of Science:
- Plant Biology
- Molecular Biology
- Genetics
Background:
- Plants balance growth and defense responses.
- The polymerase-associated factor 1 complex (PAF1C) is crucial for transcription.
- Understanding the regulation of the growth-defense tradeoff is vital for plant resilience.
Purpose of the Study:
- To investigate the role of PAF1C in regulating the growth-defense tradeoff in Arabidopsis.
- To elucidate the molecular mechanisms by which PAF1C controls defense gene expression.
- To identify key players interacting with PAF1C in this regulatory pathway.
Main Methods:
- Gene expression analysis in Arabidopsis mutants.
- Chromatin immunoprecipitation to identify gene targets.
- Protein-protein interaction studies.
- Genetic analysis of mutant interactions.
Main Results:
- Loss of PAF1C leads to increased defense gene expression, enhanced disease resistance, and reduced growth.
- PAF1C directly binds defense genes and interacts with histone deacetylase HDA6 to repress transcription.
- Salicylic acid signaling promotes NPR1-mediated degradation of PAF1, placing PAF1 downstream of NPR1.
Conclusions:
- PAF1C acts as a repressor of defense genes, mediating the growth-defense tradeoff in Arabidopsis.
- The NPR1-PAF1C-HDA6 module is identified as a key regulator of plant immunity and growth.
- This finding provides insights into the molecular basis of plant defense strategies.
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