Article

Plant Systematics and Evolution

, Volume 163, Issue 3, pp 153-163

DNA divergency and speciation inSymbiodinium (Dinophyceae)

  • Rudolf J. BlankAffiliated withInstitut für Botanik und Pharmazeutische Biologie, Biologikum, Universität Erlangen-Nürnberg
  • , Volker A. R. HussAffiliated withInstitut für Botanik und Pharmazeutische Biologie, Biologikum, Universität Erlangen-Nürnberg

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Abstract

Relationship among symbiotic dinoflagellates of the genusSymbiodinium derived from seven different host species has been studied by means of DNA/DNA hybridization. DNA homologies range from about 70 to 30%D. Highest homology is regarded as subspecific level. Based on the characteristics of DNA and phenotypes,Symbiodinium microadriaticum subsp.microadriaticum is separated fromSymbiodinium microadriaticum subsp.condylactis. Lowest homology occurs at the methodical background, and is similar to that obtained with DNA of algae belonging to different classes. The data are in excellent agreement with DNA base composition, karyotypes, and morpohological as well as biochemical markers, emphasizing speciation among these gymnodinioid zooxanthellae.

Key words

Algae Dinophyceae Gymnodiniales Gymnodiniaceae Symbiodinium S. microadriaticum subsp.condylactis subsp. nov. DNA hybridization karyotypes phenotypes symbiosis taxonomy zooxanthellae