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Plant and Cell Physiology Advance Access originally published online on November 27, 2006
Plant and Cell Physiology 2007 48(1):110-121; doi:10.1093/pcp/pcl043
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© The Author 2006. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Comparative Overviews of Clock-Associated Genes of Arabidopsis thaliana and Oryza sativa

Masaya Murakami*, Yasuhiro Tago, Takafumi Yamashino and Takeshi Mizuno

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

*Corresponding author: E-mail, t2706775{at}mbox.nagoya-u.ac.jp; Fax, +81-52-789-4091.


  Abstract

In higher plants, circadian rhythms are highly relevant to a wide range of biological processes. To such circadian rhythms, the clock (oscillator) is central, and recent intensive studies on the model higher plant Arabidopsis thaliana have begun to shed light on the molecular mechanisms underlying the functions of the central clock. Such representative clock-associated genes of A. thaliana are the homologous CCA1 and LHY genes, and five PRR genes that belong to a small family of pseudo-response regulators including TOC1. Others are GI, ZTL, ELF3, ELF4, LUX/PCL1, etc. In this context, a simple question arose as to whether or not the molecular picture of the model Arabidopsis clock is conserved in other higher plants. Here we made an effort to answer the question with special reference to Oryza sativa, providing experimental evidence that this model monocot also has a set of highly conserved clock-associated genes, such as those designated as OsCCA1, OsPRR-series including OsTOC1/OsPRR1, OsZTLs, OsPCL1 as well as OsGI. These results will provide us with insight into the general roles of plant circadian clocks, such as those for the photoperiodic control of flowering time that has a strong impact on the reproduction and yield in many higher plants.

Keywords: Arabidopsis thaliana - Circadian rhythm - Oryza sativa - Plant clock

Abbreviations: CCA1, circadian clock associated 1; LUX, lux arrhythmo; PCL1, phytoclock 1; PCLL, PCL1-LIKE; PRR, pseudo-response regulators; TOC1, timing of cab expression1; ZTL, zeitlupe.

(Received September 12, 2006; Accepted November 20, 2006)
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