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Abscisic acid (ABA) represses the transcriptional activity of chloroplast genes (determined by run‐on assays), with the exception of psbD and a few other genes in wild‐type Arabidopsis seedlings and mature rosette leaves. Abscisic acid does not influence chloroplast transcription in the mutant lines abi1‐1 and abi2‐1 with constitutive protein phosphatase 2C (PP2C) activity, suggesting that ABA affects...
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