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Plant and Cell Physiology, 1995, Vol. 36, No. 5 759-764
© 1995

Growth and Osmoregulation of Chaetoceros muelleri in Relation to Salinity

Shuhei Fujii1, Naoki Nishimoto1, Ayuko Notoya1 and Johan A. Hellebust2

1Laboratory of Biology and Chemistry, Tezukayama College 3-1-3, Gakuen-minami, Nara, 631 Japan
2Department of Botany, University of Toronto Willcocks St., Toronto, Ontario, Canada M5S 3B2

The growth and osmoregulation of Chaetoceros muelleri Lemmermann (Bacillariophyceae) were investigated as a function of salinity. This centric diatom grew well over a wide range of salinity and required concentrations of NaCl above 10 mM for growth. Using gas chromatography- mass spectroscopy (GC-MS) analysis of cell extracts, we demonstrated that the alga contains an isomer of cyclohexanetetrol. The level of this isomer increased with increasing salinity. Levels of free amino acids also increased with increasing salinity, and quantitative determination with an amino acid analyzer revealed that the level of glutamic acid increased the most with increases in salinity. Levels of intracellular K+ and Cl– also increased significantly with increases in salinity. Thus, in C. muelleri, not only organic solutes such as the cyclohexanetetrol isomer and glutamic acid, but also inorganic solutes such as K+ and Cl– contribute to osmoregulation.

(Received November 7, 1994; Accepted April 10, 1995)
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