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The ArWOX11-ArNRPM3 Module Decreases Drought Tolerance Through Abscisic Acid Signal Pathway in Anoectochilus
Aimin Lv1, Yu Zhang1, Yanqin Zhu1
1State Key Laboratory for Development and Utilization of Forest Food Resources, Zhejiang A&F University, Hangzhou 311300, China.
Journal of Agricultural and Food Chemistry
|June 18, 2026
Summary
The ArWOX11 transcription factor negatively impacts drought resistance in plants. It interacts with ArNRPM3 to suppress the ArPP2C25 gene, affecting drought adaptation mechanisms.
Area of Science:
- Plant Biology
- Molecular Biology
- Genetics
Background:
- Drought stress severely affects plant growth, including Anoectochilus roxburghii.
- WUSCHEL-related homeobox (WOX) transcription factors are known to regulate plant development and responses to abiotic stresses.
- The specific role of WOX factors in Anoectochilus roxburghii's drought response is not well understood.
Purpose of the Study:
- To identify and characterize drought-responsive WOX transcription factors in Anoectochilus roxburghii.
- To elucidate the molecular mechanism by which WOX factors mediate drought responses in Anoectochilus roxburghii.
- To investigate the interaction of ArWOX11 with other regulatory proteins in the context of drought stress.
Main Methods:
- Identification of drought-responsive WOX genes in Anoectochilus roxburghii.
- Overexpression studies of ArWOX11 in Arabidopsis thaliana and Anoectochochilus roxburghii.
- Promoter binding assays to determine ArWOX11's interaction with ArPP2C25.
- Protein-protein interaction studies using co-immunoprecipitation or yeast two-hybrid assays.
- Analysis of gene expression and physiological responses under drought conditions.
Main Results:
- ArWOX11 was identified as a drought-responsive WOX transcription factor.
- Overexpression of ArWOX11 diminished drought resistance in both Arabidopsis and Anoectochilus roxburghii.
- ArWOX11 directly binds to and transcriptionally represses the ArPP2C25 promoter.
- ArWOX11 interacts with itself and a novel plasma membrane-associated protein, ArNRPM3.
- Co-expression of ArWOX11 and ArNRPM3 exacerbated water loss and suppressed ArPP2C25 expression, an effect partially alleviated by abscisic acid (ABA).
Conclusions:
- The study reveals that the ArWOX11-ArNRPM3 module plays a crucial role in Anoectochilus roxburghii's response to drought stress.
- ArWOX11 acts as a negative regulator of drought resistance by repressing ArPP2C25 expression, potentially through interaction with ArNRPM3.
- These findings provide novel insights into the mechanism of WOX transcription factors in plant drought adaptation and stress signaling pathways.
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