Abstract
Transient expression of genes in protoplasts has been used widely for purposes ranging from subcellular localization to promoter activity analyses. Here, we describe methods for reconstituting the abscisic acid (ABA) signaling pathway using a transient expression system in rice protoplasts. ABA signaling is monitored via reporter systems consisting of synthetic promoters and luciferase. Thus, the effects of each signaling component as well as complexes involved in ABA signaling can be characterized in rice protoplasts, overcoming many of the limitations that hamper efforts to identify biological functions of effector genes in whole plants. This protoplast-based transient assay system for ABA signaling thus provides valuable tools and knowledge for understanding complicated ABA signaling networks.
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