Modulation of RNA processing by abscisic acid

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The phytohormone abscisic acid (ABA) regulates various developmental and stress-induced processes in plants. Several ABA response genes encode for RNA-binding or RNA-processing proteins, and recent studies on Arabidopsis ABA-sensitivity mutants have shown ABA involvement in post-transcriptional mRNA processing. Arabidopsis genome encodes more than 200 putative RNA-binding proteins; half of which are plant-specific. RNA-binding proteins mediate mRNA synthesis, splicing, transport, translation and degradation and by influencing transcript abundance, RNA-binding proteins provide a major regulatory role in fine-tuning cellular protein expression.