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JOURNAL OF PLANKTON RESEARCH | VOLUME 19 | NUMBER 12 | PAGES 2031-2040 | 1997
© Oxford University Press

research-article

Somatic polyploidy examined by flow cytometry in Daphnia

Helena Korpelainen, Matti Ketola1 and Jaana Hietala1

Department of Biosciences, Division of Genetics PO Box 56, FIN-00014 University of Helsinki Finland 1Department of Biology, Laboratory of Ecological Zoology FIN-20014 University of Turku Finland

Received on January 7, 1997; accepted on August 18, 1997 Flow cytometry was used to examine the patterns of somatic polyploidy and to determine the haploid genome sizes in Daphnia. The average proportions of polyploid nuclei among adult animals of D.pulex, D.longispina, D.pulex x D.longispina and D.magna equalled 27, 24, 24 and 24%, respectively. Both interclonal and developmentally regulated variation were observed in the level of somatic polyploidy. Adult animals expressed more extensive polyploidy than did juveniles. The estimates of the haploid genome sizes (C values) of D.pulex, D.longispina, D.pulex x D.longispina and D.magna equalled 0.32, 0.27, 0.26 and 0.37 pg, respectively. These are the smallest genomes reported in crustaceans. Apparently, somatic polyploidy compensates for the loss of genetic material and gives rise to genetic plasticity which may contribute to the considerable level of phenotypic plasticity observed in Daphina.


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