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Plant and Cell Physiology, 2001, Vol. 42, No. 3 334-339
© 2001 Oxford University Press

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

Seiya Makino1, Akinori Matsushika1, Masaya Kojima, Yoshihiro Oda and Takeshi Mizuno2

Laboratory of Molecular Microbiology, School of Agriculture, Nagoya University, Chikusa-ku, Nagoya, 464-8601 Japan

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.

1 These two authors equally contributed to this work.

2 Corresponding author: E-mail, tmizuno@agr.nagoya-u.ac.jp; Fax, +81-52-789-4089.


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