溪鲑早期生活史特征和耐热性的选择效应

IF 1 4区 生物学 Q3 ZOOLOGY Canadian Journal of Zoology Pub Date : 2023-11-24 DOI:10.1139/cjz-2023-0086
Clémence Gourtay, Marine Rivolet, Léopold Ghinter, Louis Bernatchez, D. Garant, C. Audet
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引用次数: 0

摘要

在气候变化的背景下,了解经过驯化和/或选择的动物是否能保持其适应热环境变化的能力至关重要。在这里,我们测试了没有性早熟的选择与更好的生长性能如何影响溪鲑Salvelinus fontinalis(Mitchill,1814年)在热应力下的抗热性和基因表达反应。我们对溪流红点鲑 0+ 幼体进行了温度挑战测试,并研究了心脏和肝脏组织中参与氧化应激反应、热休克蛋白合成或参与细胞凋亡调控的基因的表达情况。与对照组相比,被选系的幼体具有更高的耐热性,失去平衡的温度平均比对照组高 1°C。选育品系的幼鱼体内过氧化氢酶和 HSP70 的相对表达量明显更高。总体而言,热敏感鱼类的特征是体重和体长较低,与应激反应相关基因的相对表达量较低。我们的研究结果表明,相关性状的选择可能与发育早期对生长的显著品系效应有间接关系。
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Selection effects on early life history traits and thermal resistance in brook charr Salvelinus fontinalis
In the context of climate change, it is crucial to understand whether animals that have been domesticated and/or selected maintain their abilities to adapt to changes in their thermal environment. Here, we tested how selection for absence of early sexual maturation combined with better growth performance may have impacted thermal resistance and gene expression response in the presence of thermal stress in brook charr Salvelinus fontinalis (Mitchill, 1814). We performed temperature challenge tests on brook charr 0+ juveniles and studied the expression of genes involved in the response to oxidative stress, in synthesis of heat shock proteins, or involved in regulation of apoptosis, in heart and liver tissues. Juveniles from the selected lineage had a higher thermal resistance than controls and a loss of equilibrium occurred on average 1°C above what was observed for the controls. The relative expressions of catalase and HSP70 were significantly higher in juveniles from the selection program. Overall, thermally sensitive fish were characterized by low mass and length and lower relative expressions of genes associated with stress response. Our results indicate that selection for traits of interests may be indirectly related to the significant lineage effect on growth in early stages of development.
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来源期刊
Canadian Journal of Zoology
Canadian Journal of Zoology 生物-动物学
CiteScore
2.40
自引率
0.00%
发文量
82
审稿时长
3 months
期刊介绍: Published since 1929, the Canadian Journal of Zoology is a monthly journal that reports on primary research contributed by respected international scientists in the broad field of zoology, including behaviour, biochemistry and physiology, developmental biology, ecology, genetics, morphology and ultrastructure, parasitology and pathology, and systematics and evolution. It also invites experts to submit review articles on topics of current interest.
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