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Plant and Cell Physiology Advance Access originally published online on January 16, 2008
Plant and Cell Physiology 2008 49(3):481-487; doi:10.1093/pcp/pcn008
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© The Author 2008. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Short Communication

Comparative Transcriptome of Diurnally Oscillating Genes and Hormone-Responsive Genes in Arabidopsis thaliana: Insight into Circadian Clock-Controlled Daily Responses to Common Ambient Stresses in Plants

Takeshi Mizuno and Takafumi Yamashino*

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

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


  Abstract

By adopting two distinct types of comprehensive transcriptome data sets, which are available to the public, we asked the critical question as to whether or not there is any significant correlation between diurnally oscillating genes during the light/dark daily cycle and hormone-responsive genes. The hormones studied here were ABA, ethylene, brassinosteroid, cytokinin, gibberellin, auxin and jasmonate. It was revealed that the expression of a significantly large number of ABA-responsive and/or methyl jasmonate (MJ)-responsive genes oscillate diurnally and robustly during the light/dark cycle. The results of this study implied that some aspects of plant stress responses, basically mediated by ABA and/or MJ, might be regulated daily though the circadian clock function at the level of transcription in order to prepare properly for action against common ambient stresses by anticipating the diurnal day/night cycle.

Keywords: Arabidopsis - Circadian rhythm - Hormone response - Microarray - Stress response

Abbreviations: ACC, 1-amino-cyclopropane-1-carboxylic acid; BL, brassinolide; CK, cytokinin; GA3, gibberellic acid 3; MJ, methyl jasmonate; PRR, pseudo-response regulator.

(Received November 20, 2007; Accepted January 8, 2008)
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