The ABCF3 Gene of Arabidopsis Is Functionally Linked with GCN1 but Not with GCN2 During Stress and Development

One of the main mechanisms regulating translation is one based on phosphorylation alpha subunit initiation factor 2 (eIF2α) by general control non-repressive (GCN2) protein kinase. In yeast, this kinase binds to two scaffold proteins (GCN1 and GCN20), facilitating its activation translating ribosomes. The homology three exists in Arabidopsis. species, whereas activated under several stress situations, involvement those processes controversial, a new role for GCN1 translation, independent eIF2α, has been proposed. Arabidopsis presents five genes with GCN20 (ABCF1 5) genome. We show here that any these needed eIF2α phosphorylation. Furthermore, plant phenotypes abiotic stresses chloroplast development suggest ABCF3 functionally linked GCN1, but not GCN2. Finally, gcn1 abcf3 mutants share similar transcriptional reprogramming, affecting photosynthesis responses. common downregulation regulators flagellin receptor FLS2 both observed defect pathogen-associated molecular pattern (PAMP)-induced stomatal closure could be mediated proteins.