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The negative correlation between somatic aneuploidy and growth in the oyster Crassostrea gigas and implications for the effects of induced polyploidization

Published online by Cambridge University Press:  14 April 2009

E. Zouros ,
C. Thiriot-Quievreux  and
G. Kotoulas
E. Zouros*
Affiliation:
Department of Biology, The University of Crete, and Institute of Marine Biology of Crete, Iraklion, Crete, Greece Department of Biology, Dalhousie University, Halifax, N.S., CanadaB3H 4J1
C. Thiriot-Quievreux
Affiliation:
Observatoire Oceanologique, Université P. et M. Curie — CNRS, B.P. 28, F-06230, Villefranche-sur-Mer, France
G. Kotoulas
Affiliation:
Department of Biology, The University of Crete, and Institute of Marine Biology of Crete, Iraklion, Crete, Greece
*
* Corresponding author.

Summary

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This study extends previous observations that chromosome loss in somaticcells of juveniles of the pacific oyster Crassostrea gigas is associated with reduced growth rate. All four studies designed to examine this association (two usingrandom population samples and two using full sibs) produced the same result. This consistent effect appears to be unrelated with the commonly, but not consistently, observed correlation between degree of allozyme heterozygosity and growth. We propose thatthe inverse relationship between aneuploidy and growth is due to the unmasking of deleterious recessive genes caused by ‘progressive haploidization’ of somatic cells. Because unmasking of deleterious recessive genes by random chromosome lossisunlikely in polyploid cells, this hypothesis may also provide an explanation for theobservation that artificially produced polyploid shellfish usually grow at faster rates than normal diploid ones.

Type
Research Article
Information
Genetics Research , Volume 68 , Issue 2 , October 1996 , pp. 109 - 116
Copyright
Copyright © Cambridge University Press 1996

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