Journal Article

Light Response of the Circadian Waves of the APRR1/TOC1 Quintet: When Does the Quintet Start Singing Rhythmically in Arabidopsis?

Seiya Makino, Akinori Matsushika, Masaya Kojima, Yoshihiro Oda and Takeshi Mizuno

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 42, issue 3, pages 334-339
Published in print March 2001 | ISSN: 0032-0781
Published online March 2001 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pce036
Light Response of the Circadian Waves of the APRR1/TOC1 Quintet:  When Does the Quintet Start Singing Rhythmically in Arabidopsis?

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  • Biochemistry
  • Molecular and Cell Biology
  • Plant Sciences and Forestry

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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 3 h 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 are 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.

Keywords: Key words:; Abbreviations: APRR, Arabidopsis pseudo-response regulator; TOC, timing of CAB.

Journal Article.  3709 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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