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Plant and Cell Physiology, 2002, Vol. 43, No. 1 12-20
© 2002 Oxford University Press

The Possible Involvement of a Phosphate-Induced Transcription Factor Encoded by Phi-2 Gene from Tobacco in ABA-signaling Pathways

Toshio Sano1 and Toshiyuki Nagata2

Department of Biological Sciences, Graduate School of Science, University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113-0033 Japan

A novel phosphate-induced gene, phi-2, has been identified by its induction on addition of phosphate to phosphate-starved tobacco BY-2 cells. The predicted gene product of phi-2 has significant homology to a group of bZIP proteins involved in ABA-signaling pathways, and phi-2 also responded to ABA treatment. A previously isolated phosphate-induced gene, phi-1, (Sano et al. (1999) Plant Cell Physiol. 40: 1) was also responsive to ABA. Although phosphate addition induced semi-synchronous cell division in phosphate-starved tobacco BY-2 cells, ABA adversely affected cell division. Detailed examination revealed that the high levels of phosphate required to induce semi-synchronous cell division seemed to be perceived as indicators of stress by the cells. One of the stress indicators perceived by the cells is a cytoplasmic pH change, to which phi-2 and phi-1 genes respond. The different components of the cell’s response to phosphate induction are discussed.

1 Present address: Julius-von-Sachs-Institut für Biowissenschaften, University of Würzburg, Julius-von-Sachs-Platz 2, 97082 Würzburg, Germany.

2 Corresponding author: E-mail: nagata@biol.s.u-tokyo.ac.jp; Fax, +81-3-5684-2063.


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