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The SNAC-A transcription factor ANAC032 reprograms metabolism in Arabidopsis.

Plant & Cell Physiology 2019 January 26
Studies have indicated that the carbon starvation response leads to the reprogramming of the transcriptome and metabolome, and many genes, including several important regulators, such as the group S1 basic leucine zipper transcription factors bZIP1, bZIP11, and bZIP53, the SNAC-A transcription factor ATAF1, etc., are involved in these physiological processes. Here, we show that the SNAC-A transcription factor ANAC032 also plays important roles in this process. The overexpression of ANAC032 inhibits photosynthesis and induces ROS accumulation in chloroplasts, thereby reducing sugar accumulation and resulting in carbon starvation. ANAC032 reprograms carbon and nitrogen metabolism by increasing sugar and amino acid catabolism in plants. The ChIP-qPCR and transient dual-luciferase reporter assays indicated that ANAC032 regulates trehalose metabolism via the direct regulation of TRE1 expression. Taken together, these results show that ANAC032 is an important regulator of the carbon/energy status that represses photosynthesis to induce carbon starvation.

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