Protein phosphatase 2A promotes stomatal development by stabilizing SPEECHLESS in Arabidopsis.

ABSTRACT: Stomatal guard cells control gas exchange that allows plant photosynthesis but limits water loss from plants to the environment. In Arabidopsis, stomatal development is mainly controlled by a signaling pathway comprising peptide ligands, membrane receptors, a mitogen-activated protein kinase (MAPK) cascade, and a set of transcription factors. The initiation of the stomatal lineage requires the activity of the bHLH transcription factor SPEECHLESS (SPCH) with its partners. Multiple kinases were found to regulate SPCH protein stability and function through phosphorylation, yet no antagonistic protein phosphatase activities have been identified. Here, we identify the conserved PP2A phosphatases as positive regulators of Arabidopsis stomatal development. We show that mutations in genes encoding

SUBMITTER: Bian C 

PROVIDER: S-EPMC7293623 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature