Fig. 1.

Contribution of mRNA metabolism processes to plant responses to salinity and osmotic stress. Control of splicing occurs in the nucleus and is controlled by CBP20, CBP80 and the LSM2-8 complex. Targeting of specific transcript subsets to P bodies is hypothesized to be guided by TZF proteins. Cytoplasmic mRNA decay starts with deadenylation. After shortening the poly(A) tail, transcripts can be degraded from their 3′ end via the exosome complex or undergo 5′ cap removal in a process of decapping followed by 5′→3′ decay catalyzed by XRN4. Proteins marked in blue and green are involved in responses to salt and osmotic stress, respectively, purple color denotes factors involved in salt, osmotic and ABA signaling, while yellow indicates proteins responding to osmotic stress and ABA. Proteins for which function is only hypothetical are marked with dashed circles