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Plant and Cell Physiology, 2003, Vol. 44, No. 7 770-775
© 2003 Oxford University Press

Short Communications

Protein Tyrosine Phosphorylation during Phytohormone-Stimulated Cell Proliferation in Arabidopsis Hypocotyls

Hao-Jen Huang1,4, Yu-Mei Lin1, Dinq-Ding Huang1, Takuya Takahashi2,3 and Munetaka Sugiyama2

1 Department of Biology, National Cheng Kung University, Tainan, 701 Taiwan
2 Botanical Gardens, Graduate School of Science, The University of Tokyo, Tokyo, 112-0001 Japan
3 Present address: Ninohe Agricultural Extension Service Center, Ninohe, 028-6101 Japan

Abstract

Very little is known about the molecular events triggering differentiated cells to re-enter the cell cycle. We have investigated the possible role of tyrosine phosphorylation in this process with hypocotyl explants of Arabidopsis thaliana. Phytohormone-stimulated cell cycle reactivation in hypocotyls was accompanied by tyrosine phosphorylation of several proteins. Such regulation of the tyrosine phosphorylation in these proteins was not observed in a callus-formation-deficient mutant, srd2, a result which suggests that the induction of tyrosine phosphorylation occurs as a specific event in callus cell proliferation. The promoter activity of cyclin-dependent kinase, CDKA;1, was also examined in phytohormone-stimulated hypocotyls. This study highlighted that protein tyrosine phosphorylation may play an important regulatory role in phytohormone-stimulated cell proliferation.

Footnotes

4 Corresponding author: E-mail, haojen{at}mail.ncku.edu.tw; Fax, +886-6-2742583.


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