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JPR Advance Access published online on May 17, 2005
Journal of Plankton Research, doi:10.1093/plankt/fbi027
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org
Received February 13, 2005
Accepted April 29, 2005

Short Communications

Utilization of phosphate diester by the marine diatom Chaetoceros ceratosporus

Haruo Yamaguchi 1*, Mineo Yamaguchi 1, Kimio Fukami 2, Masao Adachi 3, and Toshitaka Nishijima 3

1 Harmful Phytoplankton Section, Harmful Algal Bloom Division, National Research Institute of Fisheries and Environment of Inland Sea, Fisheries Research Agency, Ohno, Saeki, Hiroshima 739-0452, Japan
2 Laboratory of Environmental Conservation, Graduate School of Kuroshio Science, Kochi University, Nankoku, Kochi 783-8502, Japan
3 Laboratory of Aquatic Environmental Science, Faculty of Agriculture, Kochi University, Nankoku, Kochi 783-8502, Japan

* To whom correspondence should be addressed.
Haruo Yamaguchi, E-mail: yharuo{at}affrc.go.jp


  Abstract

Utilization of phosphate diester (PDE) and phosphodiesterase (PDEase) production by 5 marine phytoplankton species were examined in the laboratory to evaluate the contribution of PDE to the growth of phytoplankton. Among the 5 marine phytoplankton species tested, only Chaetoceros ceratosporus was able to use the PDE compound (bis(p-nitrophenyl) phosphate) effectively as a sole phosphorus source. In addition, C. ceratosporus simultaneously produced both PDEase and alkaline phosphatase (APase) at almost equal activity-levels under the phosphate-deficient condition. These results suggest that PDE compounds presumably play an important role as a phosphorus source for PDEase-producing phytoplankton in coastal environments.


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