LAUSR

phytochrome B (phyB) in integrating light signaling and the UPR pathways to drive and adapt plant growth. They provide evidence that under ER stress, ER stress response genes, UPR-related bZIP transcription factors, and programmed cell death (PCD) associated genes were upregulated in phyB -overexpressing plants, but not in phyB-5 mutants. These results demonstrate phyB as a positive regulator for integrating light signaling with the UPR to relieve ER stress and maintain proper plant growth. The findings also highlight that the N-terminal domain of phyB is essential for signal transduction of the ER stress response to the nucleus, which allies with light signaling.