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Plant and Cell Physiology, 2004, Vol. 45, No. 2 232-235
© 2004 Oxford University Press

Short Communication

Characterization of Transcriptional Oscillation of an Arabidopsis Homolog of PnC401 Related to Photoperiodic Induction of Flowering in Pharbitis nil

Taichi Oguchi1, Kimiyo Sage-Ono, Hiroshi Kamada and Michiyuki Ono

Gene Research Center, Institute of Biological Sciences, University of Tsukuba, Tsukuba, 305-8572 Japan

Abstract

AtC401 is an Arabidopsis homolog of PnC401 that is related to photoperiodic induction of flowering in Pharbitis nil. These genes show free-running rhythms. To study the free-running rhythm of AtC401, we fused a firefly luciferase reporter to the AtC401 promoter and transformed it into Arabidopsis plants. The observed bioluminescence oscillated under continuous light and continuous dark only with sucrose supplementation. The free-running period of bioluminescence was temperature-compensated between 22°C and 30°C. Light-pulse experiments under continuous darkness produced a phase-response curve typical of circadian rhythms. We conclude that rhythmic expression of AtC401 is controlled by a circadian oscillator.

Footnotes

1 Corresponding author: E-mail, oguchit{at}sakura.cc.tsukuba.ac.jp; Fax, +81-29-853-7746.


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