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OsERF2 Acts as a Direct Downstream Target of OsEIL1 to Negatively Regulate Salt Tolerance in Rice
Jiahao Zhou1,2,3, Shengliang Fang4, Xinjie Liu5,6
1College of Life Science, Hengyang Normal University, Hengyang, 421000, China. zhoujiahao729@126.com.
Rice (New York, N.Y.)
|April 24, 2025
Summary
Rice ethylene responsive factor 2 (OsERF2) negatively regulates salt tolerance. Knockdown of OsERF2 enhances salt tolerance by reducing oxidative stress, while OsERF2 overexpression decreases it, indicating OsERF2
Area of Science:
- Plant Molecular Biology
- Abiotic Stress Physiology
- Crop Genetics
Background:
- Salinity significantly limits plant growth and crop yield.
- Ethylene responsive factors (ERFs) are key regulators of plant responses to abiotic stress.
- OsERF2 was previously linked to hormone and sugar signaling in rice root growth.
Purpose of the Study:
- To investigate the role of OsERF2 in rice salt tolerance.
- To determine the regulatory relationship between OsEIL1 and OsERF2.
- To explore the potential of OsERF2 in improving crop stress resilience.
Main Methods:
- Generation and analysis of OsERF2 gain-of-function (nsf2857) and knockdown (Ami-ERF2) rice mutants.
- Measurement of physiological parameters including malondialdehyde and reactive oxygen species (ROS) under salt stress.
- Yeast one-hybrid and ChIP assays to confirm direct binding of OsEIL1 to the OsERF2 promoter.
Main Results:
- OsERF2 gain-of-function mutants (nsf2857) showed decreased salt tolerance, while OsERF2 knockdown (Ami-ERF2) lines exhibited enhanced salt tolerance.
- Ami-ERF2 lines had lower malondialdehyde and ROS accumulation under salt stress compared to wild type.
- OsEIL1 was confirmed to directly bind to the promoter of OsERF2, suggesting transcriptional regulation.
Conclusions:
- OsERF2 acts as a negative regulator of salt tolerance in rice.
- OsEIL1 directly regulates OsERF2 expression, mediating salt stress responses.
- OsERF2 is a potential target for genetic engineering to improve rice salt tolerance and resilience to abiotic stresses.
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