Journal
PLANT AND CELL PHYSIOLOGY
Volume 42, Issue 3, Pages 334-339Publisher
OXFORD UNIV PRESS
DOI: 10.1093/pcp/pce036
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We previously identified a novel class of proteins, named Arabidopsis pseudo-response regulators (APRRs), each of which (APRR1/TOC1, APRR3, APRR5, APRR7, APRR9) has an intriguing structural design containing an N-terminal pseudo-receiver domain and a C-terminal CONSTANS motif, Expression of these APRR1/TOC1 family members is under the control of a coordinate circadian rhythm at the level of transcription such that the APRR-mRNAs start accumulating sequentially after dawn with 2 to 3h intervals in the order of APRR9 --> APRR7 --> APRR5 --> APRR3 --> APRR1/TOC1 in a given 24 h photo-period. Based on these data, we previously proposed that these sequential and rhythmic events of transcription, termed 'circadian waves of APRR1/TOC1 quintet', may be a basis of a presumed Arabidopsis biological clock (named 'bar code clock') [Matsushika et al, (2000) Plant and Cell Physiol. 41: 1002], Here we further characterized the event of circadian waves, by demonstrating that certain light stimuli ape crucial determinants to induce the robust circadian waves, and accordingly, the first-boosted and light-induced APRR9 appears to be primarily responsible for this light response of the circadian waves. Also, as such a light stimulus, a red Light pulse that is presumably perceived by phytochromes appears to be sufficient to induce (or synchronize) the APRR1/TOC1 circadian waves.
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