AtSnRK2.4 Functions as an ABA-Responsive Protein Kinase in Arabidopsis.

ABSTRACT: In Arabidopsis, members of subclasses I and III of sucrose non-fermenting 1-related subfamily protein kinases 2 (SnRK2) are considered to be mainly osmotic- and ABA-responsive, respectively. In this work, we report on the role of SnRK2.4, a member of subclass I, in shaping plant root architecture (e.g., lateral root growth and root primordia emergence) in response to exogenous ABA. We show that SnRK2.4 is active in standard conditions and upon ABA treatment, with a higher ABA sensitivity than SnRK2.2 and SnRK2.3 from class III. To identify the molecular substrates of SnRK2.4, we compared the transcriptome, proteome, and phosphoproteome of wild-type and snrk2.4 plants, in standard conditions and after a 1 μM ABA treatment. The phosphoproteomic analysis, which relies on 3858 unique phosphope

SUBMITTER: Adamo M 

PROVIDER: S-EPMC12511474 | biostudies-literature | 2025 Sep-Oct

REPOSITORIES: biostudies-literature