Insights into the heritable variation of hypermelanosis in Chinese tongue sole (Cynoglossus semilaevis): Potential for future selective breeding

文献类型： 外文期刊

第一作者： Li, Yangzhen

作者： Li, Yangzhen;Hu, Yuanri;Zheng, Weiwei;Cui, Zhongkai;Cheng, Peng;Zhang, Tingting;Li, Yangzhen;Cui, Zhongkai;Li, Yangzhen;Cui, Zhongkai;Cheng, Jiayu

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关键词： Hypermelanosis; Pigmentation; Chinese tongue sole; Flatfish; Selection response

期刊名称：AQUACULTURE （ 影响因子：3.224； 五年影响因子：3.591 ）

ISSN： 0044-8486

年卷期： 2021 年 539 卷

页码：

收录情况： SCI

摘要： Flatfish is an important group worldwide aquaculture species, and hypermelanosis on blind side is one of the prevalent and economically important problem which drops market price significantly. Knowledge of whether genetic variation exists for hypermelanosis is needed in order to determine the feasibility of including this trait into the breeding goal. Therefore, the objective of this study was to detect the magnitude of the heritable variation and estimate the heritability for blind-side hypermelanosis by using Chinese tongue sole (Cynoglossus semilaevis). Pigmentation on blind side was defined as three types and fitted in three models respectively, i.e., (i) continuous trait (proportion of non-pigmented area to total area of the blind side) fitted in a linear model (LM); (ii) binary trait (the melanistic scored 1 and the pure white scored 0 by eyes) fitted in cross-sectional threshold model (CTM); (iii) ordinal trait (four categories based on the extent of pigmentation) fitted in ordinal threshold model (OTM). The estimated heritability on observed scale was 0.34 (LM), and on underlying scale was 0.34 and 0.38 for CTM and OTM respectively. All the heritability estimates are associated with large standard errors (SEs) and not significantly different from zero. Anyway, these results point to the existence of genetic variation of blind-side hypermelanosis and the potential for future selective breeding. The greater than zero heritability estimates imply that the selection response is expected by selective breeding in flatfish. Further studies using bigger population data (large family numbers and sample size) are highly recommended.

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