CPK2 Enhances ABA Sensitivity in Seed Germination and Root Growth by Promoting ABA-Induced <i>ABI5</i> Expression and ABI5 Protein Stability.

ABSTRACT: Abscisic acid (ABA) is a crucial phytohormone that functions as a master regulator of plant growth and development, as well as responses to diverse abiotic stresses, by integrating environmental cues with developmental programs. The transcription factor ABA INSENSITIVE 5 (ABI5) functions at the central hub of the ABA signaling pathway and mediates the expression of its target genes. Emerging evidence reveals extensive crosstalk between calcium-dependent protein kinases (CPKs)-mediated calcium signaling and the ABA-ABI5 cascade, enabling plants to balance growth and stress responses. However, the molecular mechanisms underlying the interactions between CPKs and ABA-ABI5 signaling are still elusive. In this study, we revealed that CPK2 enhances sensitivity to ABA during both seed germination

SUBMITTER: Liang X 

PROVIDER: S-EPMC12430662 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature