Context-dependent antioxidant defense system(ADS)-based stress memory in response to recurrent environmental challenges in congeneric invasive species

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外文摘要：Marine ecosystems are facing escalating environmental fluctuations owing to climate change and human activities,imposing pressures on marine species.To withstand recurring environmental challenges,marine organisms,especially benthic species lacking behavioral choices to select optimal habitats,have to utilize well-established strategies such as the antioxidant defense system(ADS)to ensure their survival.Therefore,understanding of the mechanisms governing the ADS-based response is essential for gaining insights into adaptive strategies for managing environmental challenges.Here we conducted a com-parative analysis of the physiological and transcriptional responses based on the ADS during two rounds of'hypersalinity-recovery'challenges in two model congeneric invasive ascidians,Ciona robusta and C.savignyi.Our results demonstrated that C.savignyi exhibited higher tolerance and resistance to salinity stresses at the physiological level,while C.robusta demonstrated heightened responses at the transcriptional level.We observed distinct transcriptional responses,particularly in the utilization of two superoxide dismutase(SOD)isoforms.Both Ciona species developed physiological stress memory with elevated total SOD(T-SOD)and glutathione(GSH)responses,while only C.robusta demonstrated transcriptional stress memory.The regulatory distinctions within the Nrf2-Keapl signalling pathway likely explain the formation disparity of transcriptional stress memory between both Ciona species.These findings support the'context-dependent stress memory hypothesis',emphasizing the emergence of species-specific stress memory at diverse regulatory levels in response to recurrent environmental challenges.Our results enhance our understanding of the mechanisms of environmental challenge manage-ment in marine species,particularly those related to the ADS.

外文关键词：

Antioxidant defenseAscidianBiological invasionEnvironmental stressStress memory

作者：

Hanxi Li、Xuena Huang、Aibin Zhan

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作者单位：

Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing100085,China

University of Chinese Academy of Sciences,Beijing100049,China

Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing,100085,China

Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China

University of Chinese Academy of Sciences,Beijing 100049,China

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出版年：

2024

DOI：

10.1007/s42995-024-00228-y

海洋生命科学与技术(英文)

ISSN：

年,卷(期)：2024.6(2)