Evidence for a SAL1-PAP Chloroplast Retrograde Pathway That Functions in Drought and High Light Signaling in Arabidopsis[C][W][OA]

摘要

This work describes a chloroplast-to-nucleus retrograde signaling pathway involving SAL1, a chloroplast and mitochondrial enzyme that degrades the phosphonucleotide 3′-phosphoadenosine 5′-phosphate (PAP). In the absence of SAL1 or in response to drought and high light, PAP accumulates and can move between the chloroplast and the nucleus, where it inhibits exoribonucleases, thereby inducing stress-responsive genes.