The Arabidopsis spliceosomal protein SmEb modulates ABA responses by maintaining proper alternative splicing of HAB1

Abstract Abscisic acid (ABA) signaling is critical for seed germination and abiotic stress responses in terrestrial plants. Pre-mRNA splicing known to regulate ABA signaling. However, the involvement of canonical spliceosomal components regulating poorly understood. Here, we show that spliceosome component Sm core protein SmEb plays an important role expression up-regulated by treatment, analysis Arabidopsis smeb mutant plants suggest modulates alternative HAB1 enhancing HAB1.1 variant while repressing HAB1.2 . Overexpression but not rescues ABA-hypersensitive phenotype mutants. Mutations transcription factor ABI3, 4, or 5 also reduce hypersensitivity mutants during germination. Our results regulation early seedling development.