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

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