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Circadian-Regulated Transcription of the
psbD
Light-Responsive Promoter in Wheat
Chloroplasts1
Yoichi Nakahira,
Kyoko Baba2,
Akito Yoneda,
Takashi Shiina, and
Yoshinori Toyoshima*
Graduate School of Human and Environmental Studies, Kyoto
University, Yoshida-nihonmatu-cho, Sakyo-ku, Kyoto 606-8501, Japan
The
level of mRNAs derived from the plastid-encoded psbD
light-responsive promoter (LRP) is controlled by a circadian clock(s) in wheat (Triticum aestivum). The circadian oscillations
in the psbD LRP mRNA level persisted for at least three
cycles in continuous light and for one cycle in continuous dark, with
maxima in subjective morning and minima in subjective early night. In
vitro transcription in chloroplast extracts revealed that the circadian
cycles in the psbD LRP mRNA level were dominantly
attributed to the circadian-regulated transcription of the
psbD LRP. The effects of various mutations introduced
into the promoter region on the psbD LRP activity in vitro suggest the existence of two positive elements located between  54 and 36, which generally enhance the transcription activity, and
an anomalous core promoter structure lacking the functional "35"
element, which plays a crucial role in the circadian fluctuation and
light dependency of psbD LRP transcription activity.
1
This work was supported by a Grant-in-Aid for
Scientific Research on Priority Areas (no. 10170218 to Y.T.); by
Grants-in-Aid for Scientific Research from the Ministry of Education,
Science, and Culture of Japan (no. 09874170 to Y.T. and nos. 10640629, 10309008 to T.S.); and by a grant from the Research for the Future Program, Japan Society for the Promotion of Science (no.
JSPS-RFTF96L00604 to T.S.).
2
Present address: The Institute of Physical and
Chemical Research (RIKEN), 2-1 Hirosawa, Wako 351-0106, Japan.
*
Corresponding author; e-mail
toyoshima{at}soumu1.jinkan.kyoto-u.ac.jp; fax 81-75-753-6577.
Plant Physiol. (1998) 118: 1079-1088
Copyright Clearance Center: 0032-0889/98/118//10
© 1998 American Society of Plant Physiologists
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