ABA signaling prevents phosphodegradation of the SR45 splicing factor to alleviate inhibition of early seedling development in Arabidopsis.

ABSTRACT: Serine/arginine-rich (SR) proteins are conserved splicing regulators that play important roles in plant stress responses, namely those mediated by the abscisic acid (ABA) hormone. The Arabidopsis thaliana SR-like protein SR45 is a described negative regulator of the ABA pathway during early seedling development. How the inhibition of growth by ABA signaling is counteracted to maintain plant development under stress conditions remains largely unknown. Here, we show that SR45 overexpression reduces Arabidopsis sensitivity to ABA during early seedling development. Biochemical and confocal microscopy analyses of transgenic plants expressing fluorescently tagged SR45 revealed that exposure to ABA dephosphorylates the protein at multiple amino acid residues and leads to its accumulation, due to

SUBMITTER: Albuquerque-Martins R 

PROVIDER: S-EPMC10030365 | biostudies-literature | 2023 Mar

REPOSITORIES: biostudies-literature