Abnormal Karyotype of Pen Shell (Atrina pectinata) During Its Early Embryonic Development in Late Breeding Season

文献类型： 外文期刊

第一作者： Zhou Liqing

作者： Zhou Liqing;Yang Aiguo;Wu Biao;Sun Xiujun;Liu Zhihong;Chen Siqing;Zhao Dan;Zhou Liqing;Yang Aiguo;Wu Biao;Sun Xiujun;Liu Zhihong;Chen Siqing;Wang Xuemei;Zhou Liqing;Zhao Dan

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关键词： Atrina pectinata; early embryo; sex chromosome; nuclear ploidy; later breeding season

期刊名称：JOURNAL OF OCEAN UNIVERSITY OF CHINA （ 影响因子：0.913； 五年影响因子：1.012 ）

ISSN： 1672-5182

年卷期： 2020 年 19 卷 4 期

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收录情况： SCI

摘要： The pen shell,Atrina pectinata, distributes globally. It is one of the most important edible bivalves in east Asian countries. However, there are multiple difficulties in rearing pen shell larvae and juveniles because of their high mortality. To understand the mechanism underlining such high mortality at the early embryonic development stage, we obtained approximately 100 million larvae during later breeding season in June, 2017, and checked a large amount of mitotic chromosomal plates of the early embryos and post-spawning gonads tissue slices of their parents. The results showed that most diploidA. pectinataembryos have 17 pairs of chromosomes (2n= 34) as their parents do. The first pair of particularly large chromosomes are heterotypic in some diploid embryos while they are homomorphic in others. The primary sex-determination chromosome type is XX/XY. A lot of triploid, pentaploid and aneuploid embryos with different numbers of the largest homomorphic or heteromorphic chromosomes were found due to the degeneration of overmatured parent gonads which hold normal karyotype. These larvae will die even though most of them may develop into the trochophore stage with 34 chromosomes. Genetic deficiency of chromosomes will cause a high rate of mortality in early embryos in late breeding season. These findings should enrich the current knowledge of juvenile pen shell aquaculture.

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