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Plant and Cell Physiology Advance Access originally published online on May 20, 2005
Plant and Cell Physiology 2005 46(8):1423-1427; doi:10.1093/pcp/pci127
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JSPP © 2005

Short Communication

Circadian Rhythm of Circumnutation in Inflorescence Stems of Arabidopsis

Kanae Niinuma*, Nobutaka Someya1, Makoto Kimura2, Isamu Yamaguchi and Hiroshi Hamamoto

Plant Science Center, RIKEN, 1-7-22 Suehiro, Tsurumi, Yokohama, Kanagawa, 230-0045 Japan

* Corresponding author: E-mail, s0530163{at}ipe.tsukuba.ac.jp.

We investigate the modulation of circumnutation in inflorescence stems of Arabidopsis to determine the circadian regulation of circumnutation. Under constant light conditions (LL), circumnutation speed in wild-type plants fluctuates, with the phase of the highest speed at subjective dawn; the period length is close to 24 h. toc1 appears to shorten the period and elf3 causes an arrhythmic phenotype in circumnutation speed in LL, suggesting that a common circadian clock may control both circumnutation speed and other circadian outputs. These results highlight for the first time a role for a circadian clock in the regulation of circumnutation based on genetic analysis of Arabidopsis.

1 Present address: Institute of Biological Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8572 Japan

2 Present address: National Institute for Agro-Environmental Sciences, 3-1-3 Kannondai, Tsukuba, Ibaraki, 305-8604 Japan

(Received April 7, 2005; Accepted May 11, 2005)
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