Title : Recent progress in understanding the multifaceted roles of rack1 in plant growth and stress responses
Abstract:
RACK1 (Receptor for Activated C Kinase 1) is a highly conserved and multifunctional scaffold protein found in eukaryotes, including plants. In plants, RACK1 has evolved to play crucial roles in regulating various aspects of plant growth and development, as well as responses to environmental stresses. The conservation of RACK1 across different plant species suggests its fundamental role in plant biology. Recent studies have significantly advanced our understanding of RACK1's functions through the application of advanced molecular and genetic techniques. RACK1 integrates multiple signaling pathways involving plant hormones such as ehtylene, brassinosteroids (BRs), and abscisic acid (ABA) to regulate plant senescence, seed germination and root growth. Our results indicated that RACK1 participates in leaf senescence mediated by ethylene signaling via the coordination of the EIN3?miR164?ORE1 transcriptional regulatory cascade. RACK1 acts as a novel negative regulator of ABI5 to regulate the homeostasis of ABA signalling in acute seed germination and early plant development. RACK1 also functions as a flexible platform that connects multiple key components of light signaling pathways to facilitate hypocotyl elongation and regulate root meristem development.
