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Direct regulation of abiotic responses by the A rabidopsis circadian clock component PRR 7
Author(s) -
Liu Tiffany,
Carlsson Jenny,
Takeuchi Tomomi,
Newton Linsey,
Farré Eva M.
Publication year - 2013
Publication title -
the plant journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.058
H-Index - 269
eISSN - 1365-313X
pISSN - 0960-7412
DOI - 10.1111/tpj.12276
Subject(s) - transcriptome , psychological repression , circadian clock , biology , arabidopsis , circadian rhythm , microbiology and biotechnology , transcription factor , gene , abiotic component , abiotic stress , gene expression , regulator , clock , regulation of gene expression , genetics , neuroscience , ecology , mutant
Summary Up to 30% of the plant transcriptome is circadian clock‐regulated in different species; however, we still lack a good understanding of the mechanisms involved in these genome‐wide oscillations in gene expression. Here, we show that PSEUDO ‐ RESPONSE REGULATOR 7 ( PRR 7), a central component of the A rabidopsis clock, is directly involved in the repression of master regulators of plant growth, light signaling and stress responses. The expression levels of most PRR 7 target genes peak around dawn, in an antiphasic manner to PRR 7 protein levels, and were repressed by PRR 7. These findings indicate that PRR 7 is important for cyclic gene expression by repressing the transcription of morning‐expressed genes. In particular we found an enrichment of the genes involved in abiotic stress responses, and in accordance we observed that PRR 7 is involved in the oxidative stress response and the regulation of stomata conductance.