Abstract
ANAC102 is a transcription factor involved in stress response and brassinosteroids signaling, with circadian regulation controlled by phytochromes. ANAC102 has been proposed to have a role in downregulating chloroplast transcription, which may be very useful in reducing photosynthesis and chloroplast energy demand under stress conditions. However, its localization in the chloroplast has mainly been demonstrated by using constitutive promoters. In this work, we recapitulate the literature, clarify which are ANAC102 isoforms in Arabidopsis and analyze their expressions under control conditions and in response to stress. Based on our results, the most highly expressed ANAC102 isoform encodes for a nucleocytoplasmic protein and the N-terminal chloroplast-targeting peptide appears to be present only in Brassicaceae, and not involved in stress response.
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