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Plant and Cell Physiology Advance Access published online on August 12, 2005
Plant and Cell Physiology, doi:10.1093/pcp/pci174
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Plant and Cell Physiology 2005 © The Japanese Society of Plant Physiologists (JSPP); all rights reserved.
Received November 15, 2004
Accepted July 20, 2005

Short Communication

Response to Darkness of Late-Responsive Dark-Inducible Genes Is Positively Regulated by Leaf Age and Negatively Regulated by Calmodulin-Antagonist-Sensitive Signalling in Arabidopsis thaliana

Yuki Fujiki 1, Yuka Nakagawa 2, Tsuyoshi Furumoto 3, Satoko Yoshida 4, Basanti Biswal 5, Masaki Ito 6*, Akira Watanabe 2 8, and Ikuo Nishida 7

1 Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Bunkyo-ku, Hongo, Tokyo, 113-0033 Japan; Present address: Department of Cell Biology, National Institute for Basic Biology, Nishigonaka 38, Myodaiji, Okazaki 444-8585, Japan
2 Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Bunkyo-ku, Hongo, Tokyo, 113-0033 Japan
3 Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Bunkyo-ku, Hongo, Tokyo, 113-0033 Japan; Present address: Laboratory of Plant Molecular Physiology, Department of Biological Science, Graduate School of Science, Hiroshima University, Kagamiyama 1-3-1, Higashi-Hiroshimashi, Hiroshima, 739-8526, Japan
4 Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Bunkyo-ku, Hongo, Tokyo, 113-0033 Japan; Present address: Department of Biology I, Genetics, University of Munich (LMU), Maria-Ward str. 1a, D-80638, Munich, Germany
5 Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Bunkyo-ku, Hongo, Tokyo, 113-0033 Japan; Present address: School of Life Sciences, Sambalpur University, Jyotivihar-768019, Orissa, India
6 Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Bunkyo-ku, Hongo, Tokyo, 113-0033 Japan; Present address: Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa-ku, Nagoya 464-8601, Japan
7 Department of Biochemistry and Molecular Biology, Saitama University, 255 Shimo-Okubo, Sakura-Ku, Saitama City, Saitama 338-8570, Japan

* To whom correspondence should be addressed.
Masaki Ito, E-mail: masakito{at}nuagr1.agr.nagoya-u.ac.jp


  Abstract

Induction after prolonged darkness distinguishes the late-responsive genes din2 and din9 from the early-responsive gene din3 in Arabidopsis. The former genes were coincidently induced with the senescence marker gene YLS4 in rosette leaves of different ages and in the early-senescence mutant hys1. The calmodulin antagonists W-7, trifluoperazine, and fluphenazine accelerated the expression of the former genes in darkness but not in light, and had little effect on the latter gene. Our results suggest that Ca2+/calmodulin signalling conveys a negative signal that suppresses the responses of late-responsive din genes to prolonged darkness. The results are discussed in relation to natural senescence.

Keywords: Arabidopsis; Calmodulin; Darkness; Leaf age; Senescence.

8 Deceased on May 22, 2000


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