Journal Article

The Evolutionarily Conserved <i>Os</i>PRR Quintet: Rice Pseudo-Response Regulators Implicated in Circadian Rhythm

Masaya Murakami, Motoyuki Ashikari, Kotaro Miura, Takafumi Yamashino and Takeshi Mizuno

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 44, issue 11, pages 1229-1236
Published in print November 2003 | ISSN: 0032-0781
Published online November 2003 | e-ISSN: 1471-9053 | DOI:
The Evolutionarily Conserved OsPRR Quintet: Rice Pseudo-Response Regulators Implicated in Circadian Rhythm

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


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In Arabidopsis thaliana, a number of circadian-associated factors have been identified, including TOC1 (TIMING OF CAB EXPRESSION 1) that is believed to be a component of the central oscillator. TOC1 is a member of a small family of proteins, designated as ARABIDOPSIS PSEUDO-RESPONSE REGULATORS (APRR1/TOC1, APRR3, APRR5, APRR7, and APRR9). As demonstrated previously, these APRR1/TOC1 quintet members are crucial for a better understanding of the molecular links between circadian rhythms, control of flowering time through photoperiodic pathways, and also photosensory signal transduction in this dicotyledonous plant. In this respect, both the dicotyledonous (e.g. A. thaliana) and monocotyledonous (e.g. Oryza sativa) plants might share the evolutionarily conserved molecular mechanism underlying the circadian rhythm. Based on such an assumption, and as the main objective of this study, we asked the question of whether rice also has a set of pseudo-response regulators, and if so, whether or not they are associated with the circadian rhythm. Here we showed that rice has five members of the OsPRR family (Oryza sativa Pseudo-Response Regulator), and also that the expressions of these OsPRR genes are under the control of circadian rhythm. They are expressed in a diurnal and sequential manner in the order of OsPRR73 (OsPRR37)→OsPRR95 (OsPRR59)→OsPRR1, which is reminiscent of the circadian waves of the APRR1/TOC1 quintet in A. thaliana. These and other results of this study suggested that the OsPRR quintet, including the ortholog of APRR1/TOC1, might play important roles within, or close to, the circadian clock of rice.

Keywords: Keywords: APRR1/TOC1 quintet — Arabidopsis thaliana — Circadian rhythm — Flowering time — Oryza sativa — Pseudo-response regulator.; Abbreviations: APRR, Arabidopsis pseudo-response regulator; OsPRR, Oryza sativa pseudo-response regulator; QTL, rice quantitative trait loci.

Journal Article.  4964 words.  Illustrated.

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

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