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AtSnRK2.4 Functions as an ABA-Responsive Protein Kinase in Arabidopsis
Mattia Adamo1, Colette Tournaire-Roux1, Valérie Rofidal1
1Institute for Plant Sciences of Montpellier, University Montpellier, CNRS, INRAE, Institut Agro, Montpellier, France.
Physiologia Plantarum
|October 10, 2025
Summary
Sucrose non-fermenting 1-related subfamily protein kinases 2 (SnRK2.4) in Arabidopsis influences root architecture by responding to abscisic acid (ABA). This study reveals SnRK2.4
Area of Science:
- Plant Biology
- Molecular Plant Physiology
- Biochemistry
Background:
- Sucrose non-fermenting 1-related subfamily protein kinases 2 (SnRK2s) are crucial in plant stress responses.
- Subclass I SnRK2s are typically linked to osmotic stress, while Subclass III SnRK2s are associated with abscisic acid (ABA) signaling.
Purpose of the Study:
- To investigate the role of SnRK2.4, a Subclass I SnRK2, in regulating plant root architecture in response to ABA.
- To identify the molecular targets and pathways regulated by SnRK2.4 under standard and ABA-treated conditions.
Main Methods:
- Comparative analysis of transcriptome, proteome, and phosphoproteome in wild-type and snrk2.4 Arabidopsis mutants.
- ABA treatment (1 μM) to assess differential protein phosphorylation and abundance.
- Bioinformatic analysis to identify regulated proteins and pathways.
Main Results:
- SnRK2.4 is active under standard conditions and ABA treatment, exhibiting higher ABA sensitivity than Subclass III SnRK2s.
- Phosphoproteomic analysis identified numerous proteins under-phosphorylated in snrk2.4 mutants, affecting membrane transporters and cell-to-cell communication.
- ABA treatment revealed SnRK2.4's specific regulation of RNA helicases, suggesting interference with mRNA splicing, and modulation of ABA signaling attenuation, lipid signaling, and cellulose biosynthesis pathways.
Conclusions:
- SnRK2.4 plays a significant role in ABA-mediated regulation of root architecture in Arabidopsis.
- SnRK2.4 demonstrates high ABA sensitivity and impacts fundamental cellular processes, including transport, signaling, and biosynthesis.
- The findings highlight SnRK2.4's complex role in plant physiology beyond osmotic stress responses.
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