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Plant and Cell Physiology, 2002, Vol. 43, No. 1 118-122
© 2002 Oxford University Press

Short Communications

The APRR1/TOC1 Quintet Implicated in Circadian Rhythms of Arabidopsis thaliana: II. Characterization with CCA1-Overexpressing Plants

Akinori Matsushika, Seiya Makino, Masaya Kojima, Takafumi Yamashino and Takeshi Mizuno1

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

Abstract

We previously identified a novel class of proteins, named pseudo-response regulators (APRRs) in Arabidopsis thaliana, each of which (APRR1, APRR3, APRR5, APRR7, and APRR9) has an intriguing structural design containing an N-terminal pseudo receiver domain and a C-terminal CONSTANS motif. Among them, APRR1 is identical to TOC1, previously proposed to be a candidate component of an Arabidopsis circadian clock. Intriguingly, expressions of the APRR1/TOC1 family of genes are under control of coordinate circadian rhythms at the level of transcription, in the manner that each APRR-transcript starts accumulating sequentially after dawn with 2 to 3 h intervals in the order: APRR9->APRR7->APRR5->APRR3->APRR1/TOC1. Here we examined this circadian-related event, "circadian waves of the APRR1/TOC1 quintet", by employing CCA1-overexpression (CCA1-ox) transgenic plants, based on the fact that CCA1 is a well-characterized and the most plausible oscillator component. It was found that aberrant overexpression of the CCA1 gene severely perturbed free-running and sequential rhythms of the APRR1/TOC1 family of genes. In the accompanying paper, it was shown that overexpression of APRR1 also results in a marked alteration of the CCA1 circadian rhythm, and vice versa. Taken together, it was suggested that there are intimate and mutual links between these two types of circadian-associated components (APRRs and CCA1).

Footnotes

1 Corresponding author: E-mail, tmizuno@agr.nagoya-u.ac.jp; Fax, +81-52-789-4091.


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