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Marine Biotechnology

, Volume 7, Issue 2, pp 128–133 | Cite as

Low Temperature Stimulates Cell Enlargement and Intracellular Calcification of Coccolithophorids

  • Joy M. Sorrosa
  • Manami Satoh
  • Yoshihiro Shiraiwa
Article

Abstract

Temperature effect on growth, cell size, calcium uptake activity, coccolith production was studied in coccolith-producing haptophytes, Emiliania huxleyi (Lohmann) Hay & Mohler (strain EH2) and Gephyrocapsa oceanica Kamptner (strain GO1) (Coccolithophorales, Prymnesiophyceae). E. huxleyi grew at a wider temperature range (10°–25°C), while G. oceanica growth was limited to warmer temperatures (20°–25°C). Cell size was inversely correlated with temperature. At low temperature, the enlargement of chloroplasts and cells and the stimulation of coccolith production were morphologically confirmed under fluorescent and polarization microscopes, respectively. 45 Ca uptake by E. huxleyi at 10°C was greatly increased after a 5-day lag and exceeded that at 20°C. These results clearly showed that low temperature suppressed coccolithophorid growth but induced cell enlargement and as stimulated the intracellular calcification that produces coccoliths.

Keywords

calcification calcium uptake cell size coccolithophorids cold stress temperature effect 

Notes

Acknowledgments

The authors are grateful for the help extended by Dr. Koji Iwamoto of the University of Tsukuba, Japan. This study was supported in part by the Salt Foundation Science Research, Tokyo (grant 0025) in 2000 and a Grant-in-Aid for Scientific Research (A) by the Japanese Ministry of Education, Science, Sport and Culture (grant 14209012) in 2002.

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Copyright information

© Springer Science+Business Media, Inc. 2005

Authors and Affiliations

  • Joy M. Sorrosa
    • 1
  • Manami Satoh
    • 1
  • Yoshihiro Shiraiwa
    • 1
  1. 1.Functional Biosciences, Graduate School of Life and Environmental SciencesUniversity of TsukubaTsukubaJapan

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