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Plant and Cell Physiology, 2003, Vol. 44, No. 2 183-189
© 2003 Oxford University Press

Inhibition of Plastid Division by Ampicillin in the Pteridophyte Selaginella nipponica Fr. et Sav.

Yoshihiro Izumi1,4, Kanji Ono2 and Hiroyoshi Takano3

1 Faculty of Education and Welfare Science, Oita University, Dannoharu, Oita, 870-1192 Japan
2 Department of Biological Science, Faculty of Science, Kumamoto University, Kurokami, Kumamoto, 860-8555 Japan
3 Graduate School of Science and Technology, Kumamoto University, Kurokami, Kumamoto, 860-8555 Japan

We investigated the effect of the ß-lactam antibiotic, ampicillin, on plastid division in the pteridophyte Selaginella nipponica. Guard cells of plantlets treated with 1 mM ampicillin only often had one plastid, whereas guard cells of untreated plantlets had two to four plastids. We generated a S. nipponica cell culture system and used it to investigate the effects of ampicillin. Treatment with 1 mM ampicillin had no effect on cell division in culture. We classified cultured cells into four types based on the number of plastids they contained: one (Type I), two (Type II), three or four (Type III) and more than five (Type IV). After 3 d in culture, the percentage of each cell type (I–IV) was 29.5, 46.7, 20.9, and 1.9%, respectively. Subsequently, the percentage of Types III and IV increased gradually, reaching 61.9 and 11.4%, respectively, after 15 d in culture in the absence of ampicillin. When 1 mM ampicillin was added, there was a minimal increase in the number of Type III and IV cells, with high percentages of Type I and II cells (32.4 and 45.7%, respectively) after 15 d. These results suggest that ampicillin inhibits plastid division in S. nipponica.

4 Corresponding author. E-mail, yizumi{at}cc.oita-u.ac.jp; Fax, 097-554-7623.


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