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Journal of Plankton Research Vol.24 no.7 pp.735-739, 2002
© Oxford University Press 2002

SHORT COMMUNICATION

No difference found in ribosomal DNA sequences from physiologically diverse clones of Karenia brevis (Dinophyceae) from the Gulf of Mexico

P. Loret1,7, T. Tengs2, T. A. Villareal3, H. Singler3, B. Richardson4, P. Mcguire5, S. Morton6, M. Busman6 and L. Campbell1

1 Department Of Oceanography, Texas A&m University, 3146 Tamu, College Station, Tx 77843, 2 Institute Of Human Virology, University Of Maryland At Baltimore, 725 West Lombard Street, Baltimore, Md 21201, 3 Marine Science Institute, The University Of Texas—austin, 750 Channel View Drive, Port Aransas, Tx 78373, 4 Florida Fish And Wildlife Conservation Commission, Florida Marine Research Institution, 100 Eighth Avenue Southeast, ST. Petersburg, Fl 33701, 5 Department Of Biochemistry And Molecular Biology, College Of Medicine, University Of Florida, Gainesville, Fl 3210–0245 and 6 Marine Biotoxin Program, Noaa/nos, 219 FT. Johnson Road, Charleston, Sc 29412, Usa

Pascale Loret. ploret{at}eos.ubc.ca

7 Present Address: Oceanography, Department Of Earth And Ocean Sciences, University Of British Columbia, 6270 University Boulevard, Vancouver, Bc V6t 1z4, Canada

Maximum growth rate and toxin content were significantly different among five strains of Karenia brevis isolated from Texas and Florida when grown under identical culture conditions. Sequence analysis of the 18S rRNA gene and internal transcribed spacer (ITS) regions revealed, however, that all five strains were identical. Consequently, a clear genetic basis for physiological variability among various geographical isolates of K. brevis from the Gulf of Mexico could not be assessed using these genetic markers. Both the ITS and 18S rRNA regions may be useful in species-specific probe selection. At the intra-specific level, however, an alternative marker will be needed to assess the diversity among K. brevis populations in the Gulf of Mexico.


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 Appl. Environ. Microbiol.Home page
E. T. Casper, J. H. Paul, M. C. Smith, and M. Gray
Detection and Quantification of the Red Tide Dinoflagellate Karenia brevis by Real-Time Nucleic Acid Sequence-Based Amplification
Appl. Envir. Microbiol., August 1, 2004; 70(8): 4727 - 4732.
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