The multilevel responses of Acipenser baerii and its hybrids (A. baerii female x A. schrenckii male) to chronic heat stress

文献类型： 外文期刊

第一作者： Yang, Xixi

作者： Yang, Xixi;Li, Yunkun;Huang, Anqi;Kong, Fanli;Han, Xingfa;Zeng, Xianyin;Du, Xiaogang;Yang, Shiyong;Li, Datian;Huang, Xiaoli;Zhang, Chaoyang;Gong, Quan;Du, Jun;Wu, Jiayun

作者机构：

关键词： Heat stress; Acipenser baerii; Thermal resistance; HSP70

期刊名称：AQUACULTURE （ 影响因子：4.242； 五年影响因子：4.723 ）

ISSN： 0044-8486

年卷期： 2021 年 541 卷

页码：

收录情况： SCI

摘要： The global warming profoundly impacts on fishes' survival by imposing a chronic heat stress condition, but the thermoregulation mechanism of fishes, especially for cold-water fishes, against chronic heat stress remains to be explored. In this study, we evaluated the thermal resistance of Acipenser baerii and its hybrids (A. baerii female x A. schrenckii male). In the analysis of cumulative survival rate (CSR) and histologic section, the hybrids showed higher survival rate and lower gill damage than A. baerii. Under the chronic heat stress, plasma cortisol and glucose levels were increased at different degrees in A. baerii and the hybrids. At the same time, oxidative stress markers (LPO, SOD, CAT, GSH-Px and GSH) levels, and the mRNA expression levels of heat shock proteins (HSP70, HSP90, GRP75 and HSC70) and inflammation factors (IL-1 beta and TGF-beta) were also increased in A. baerii and the hybrids. Among these results, the increases were relatively higher in A. baerii at the early period (day 7) of heat stress, indicating that A. baerii is more susceptible to heat stress. In addition, the expression levels of HSP70 protein were greatly increased in A. baerii, in support of the low survival ability of A. baerii under chronic heat stress. Our study provides a direct evidence to prove the outstanding thermal resistance of the hybrids, and also contributes to understand the coping strategy of cold-water fishes to chronic heat stress.

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