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Plant and Cell Physiology Advance Access originally published online on August 12, 2005
Plant and Cell Physiology 2005 46(10):1741-1746; doi:10.1093/pcp/pci174
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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 Fujiki1,3, Yuka Nakagawa1, Tsuyoshi Furumoto1,4, Satoko Yoshida1,5, Basanti Biswal1,6, Masaki Ito1,7,*, Akira Watanabe1,8 and Ikuo Nishida2

1 Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Bunkyo-ku, Hongo, Tokyo, 113-0033 Japan
2 Department of Biochemistry and Molecular Biology, Saitama University, 255 Shimo-Okubo, Sakura-Ku, Saitama City, Saitama, 338-8570 Japan

* Corresponding author: E-mail, masakito{at}nuagr1.agr.nagoya-u.ac.jp; Fax, +81-52-789-4165.

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.

3 Present address: Department of Cell Biology, National Institute for Basic Biology, Nishigonaka 38, Myodaiji, Okazaki, 444-8585 Japan.

4 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.

5 Present address: Department of Biology I, Genetics, University of Munich (LMU), Maria-Ward str. 1a, Munich, D-80638, Germany.

6 Present address: School of Life Sciences, Sambalpur University, Jyotivihar-768019, Orissa, India.

7 Present address: Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa-ku, Nagoya, 464-8601 Japan.

8 Deceased on May 22, 2000.

(Received November 15, 2004; Accepted July 20, 2005)
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