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• W4366991547 abstract "Chloroplast-to-nucleus retrograde signaling (RS) pathways are critical in modulating plant development and stress adaptation. Among chloroplast proteins mediating RS pathways, GENOMES UNCOUPLED1 (GUN1) represses the transcription of the nuclear transcription factors GOLDEN2-LIKE1 (GLK1) and GLK2 that positively regulate chloroplast biogenesis. Given the extensive exploration of the function of GUN1 in biogenic RS carried out in previous years, our understanding of its role in plant stress responses remains scarce. Here, we revealed that GUN1 contributes to the expression of salicylic acid (SA)-responsive genes (SARGs) through transcriptional repression of GLK1/2 in Arabidopsis (Arabidopsis thaliana). Loss of GUN1 significantly compromised the SA responsiveness in plants, concomitant with the upregulation of GLK1/2 transcripts. In contrast, knockout of GLK1/2 potentiated the expression of SARGs and led to enhanced stress responses. Chromatin immunoprecipitation, coupled with quantitative PCR and related reverse genetic approaches, unveiled that in gun1, GLK1/2 might modulate SA-triggered stress responses by stimulating the expression of WRKY18 and WRKY40, transcriptional repressors of SARGs. In summary, we demonstrate that a hierarchical regulatory module, consisting of GUN1-GLK1/2-WRKY18/40, modulates SA signaling, opening a research avenue regarding a latent GUN1 function in plant-environment interactions." @default.
• W4366991547 created "2023-04-27" @default.
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• W4366991547 date "2023-04-25" @default.
• W4366991547 modified "2023-10-16" @default.
• W4366991547 title "Hierarchical regulatory module GENOMES UNCOUPLED1-GOLDEN2-LIKE1/2-WRKY18/40 modulates salicylic acid signaling" @default.
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• W4366991547 doi "https://doi.org/10.1093/plphys/kiad251" @default.
• W4366991547 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/37096689" @default.
• W4366991547 hasPublicationYear "2023" @default.
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