Negative correlation between aneuploidy and growth in the Pacific oyster, Crassostrea gigas: ten years of evidence
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چکیده
This study unites previous and new observations that chromosome loss in somatic cells of juveniles of the Pacific oyster Crassostrea gigas is associated with reduced growth rate. New data were obtained from four hatchery-produced progenies. Within each progeny, oysters of identical age were sampled and classified as fast-growing or slow-growing according to their shell length, or live weight. Chromosome numbers were individually scored from 30 randomly chosen metaphases from gill tissue. Although the diploid chromosome number in C. gigas is 2 Ns20, hypodiploid cells of 2 Ns19, 18 or 17 were observed in all progenies. The difference in percentage of aneuploidy between fastand slow-growing oysters ranged from 5% to 22% and Ž 2 . was highly significant. In one progeny, a highly significant negative correlation R s0.58 was observed between individual level of aneuploidy and growth performances individually recorded under common controlled conditions. The consistency of the negative relationship between growth rate and aneuploidy was obvious in all populations studied between 1988 and 1999. However, when comparing aneuploidy between fastand slow-growing oysters, two different groups of populations can be clearly distinguished. The question remains to determine the cause of these differences. q 2001 Elsevier Science B.V. All rights reserved.
منابع مشابه
Evidence of differential chromosome loss in aneuploid karyotypes of the Pacific oyster, Crassostrea gigas.
The G-banding technique was performed on aneuploid karyotypes from gill tissue of the Pacific oyster, Crassostrea gigas, to assess whether chromosome losses could be explained by differential chromosomal susceptibility and to clarify the negative correlation between aneuploidy and growth rate previously reported in different populations of this oyster. The study of 95 G-banded aneuploid karyoty...
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تاریخ انتشار 2000