Journal Article

Characterization of Circadian-Associated APRR3 Pseudo-Response Regulator Belonging to the APRR1/TOC1 Quintet in <i>Arabidopsis thaliana</i>

Masaya Murakami, Takafumi Yamashino and Takeshi Mizuno

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 45, issue 5, pages 645-650
Published in print May 2004 | ISSN: 0032-0781
Published online May 2004 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pch065
Characterization of Circadian-Associated APRR3 Pseudo-Response Regulator Belonging to the APRR1/TOC1 Quintet in Arabidopsis thaliana

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  • Molecular and Cell Biology
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In higher plants, there are wide ranges of biological processes that are controlled through the circadian clock. In this connection, we have been characterizing a small family of proteins, designated as ARABIDOPSIS PSEUDO-RESPONSE REGULATORS (APRR1, APRR3, APRR5, APRR7, and APRR9), among which APRR1 is identical to TOC1 (TIMING OF CAB EXPRESSION1) that is believed to be a component of the central oscillator. Through previous genetic studies, several lines of evidence have already been provided to support the view that, not only APRR1/TOC1, but also other APRR1/TOC1 quintet members are important for a better understanding of the molecular links between circadian rhythm, control of flowering time, and also photomorphogenesis. However, the least characterized one was APRR3 in that no genetic study has been conducted to see if APRR3 also plays an important role in the circadian-associated biological events. Here we show that APRR3-overexpressing transgenic plants (APRR3-ox) exhibited: (i) a phenotype of longer period (and/or delayed phase) of rhythms of certain circadian-controlled genes under continuous white light, (ii) a phenotype of late flowering under long-day photoperiod conditions, (iii) a phenotype of hypo-sensitiveness to red light during early photomorphogenesis of de-etiolated seedlings, supporting the current idea as to the APRR1/TOC1 quintet described above.

Keywords: Keywords: Arabidopsis thaliana — Circadian rhythm — Control of flowering — Light signaling — Pseudo response regulator.

Journal Article.  4206 words.  Illustrated.

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

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