Plant and Cell Physiology Advance Access originally published online on June 20, 2005
Plant and Cell Physiology 2005 46(9):1472-1476; doi:10.1093/pcp/pci158
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A Sex Pheromone, Protoplast Release-inducing Protein (PR-IP) Inducer, Induces Sexual Cell Division and Production of PR-IP in Closterium
1 Department of General Systems Studies, Graduate School of Arts and Sciences, University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo, 153-8902 Japan
2 Graduate School of Life Sciences, Toyo University, 1-1-1 Izumino, Itakura-machi, Ora-gun, Gunma, 374-0193 Japan
3 Department of Life Sciences, Graduate School of Arts and Sciences, University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo, 153-8902 Japan
4 Department of Chemical and Biological Sciences, Faculty of Science, Japan Women’s University, 2-8-1 Mejirodai, Bunkyo-ku, Tokyo, 112-8681 Japan
* Corresponding author: E-mail, tsuchik{at}dolphin.c.u-tokyo.ac.jp; Fax, +81-3-5454-6638.
The sex pheromone protoplast release-inducing protein (PR-IP) inducer and a sexual cell division-inducing pheromone-minus (SCD-IP-minus) that mediates the sexual reproduction of the heterothallic Closterium peracerosum-strigosum-littorale (C. psl) complex were investigated in this study. Recombinant PR-IP inducer produced by yeast cells was prepared and assayed for production of PR-IP and induction of SCD. Both biological activities were observed after treating mating-type plus (mt+) cells with the recombinant pheromone. SCD was induced by exposure to a lower concentration of the same pheromone and by a shorter treatment period with the pheromone than was production of PR-IP. This indicates that the previously characterized PR-IP inducer has both PR-IP-inducing and SCD-inducing activities with mt+ cells, although the inducing mechanisms of the two pheromones differ.
(Received January 5, 2005; Accepted June 15, 2005)
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