Affiliation:
1. National Engineering Research Center for Marine Aquaculture, Zhejiang Ocean University, Zhoushan 316022, China
2. Marine Science and Technical College, Zhejiang Ocean University, Zhoushan 316022, China
3. Zhejiang Province Key Lab of Mariculture and Enhancement, Marine Fisheries Research Institute of Zhejiang, Zhoushan 316021, China
Abstract
Temperature is a crucial environmental factor that affects embryonic development, particularly for marine organisms with long embryonic development periods. However, the sensitive period of embryonic development and the role of autophagy/apoptosis in temperature regulation in cephalopods remain unclear. In this study, we cultured embryos of Sepiella japonica, a typical species in the local area of the East China Sea, at different incubation temperatures (18 °C, 23 °C, and 28 °C) to investigate various developmental aspects, including morphological and histological characteristics, mortality rates, the duration of embryonic development, and expression patterns of autophagy-related genes (LC3, BECN1, Inx4) and apoptosis marker genes (Cas3, p53) at 25 developmental stages. Our findings indicate that embryos in the high-temperature (28 °C) group had significantly higher mortality and embryonic malformation rates than those in the low-temperature (18 °C) group. Furthermore, high temperature (28 °C) shortened the duration of embryonic development by 7 days compared to the optimal temperature (23 °C), while low temperature (18 °C) caused a delay of 9 days. Therefore, embryos of S. japonica were more intolerant to high temperatures (28 °C), emphasizing the critical importance of maintaining an appropriate incubation temperature (approximately 23 °C). Additionally, our study observed, for the first time, that the Early blastula, Blastopore closure, and Optic vesicle to Caudal end stages were the most sensitive stages. During these periods, abnormalities in the expression of autophagy-related and apoptosis-related genes were associated with higher rates of mortality and malformations, highlighting the strong correlation and potential interaction between autophagy and apoptosis in embryonic development under varying temperature conditions.
Funder
Zhejiang Provincial Natural Science Foundation of China
Science and technology project of Marine Fisheries Research Institute of Zhejiang
Subject
Inorganic Chemistry,Organic Chemistry,Physical and Theoretical Chemistry,Computer Science Applications,Spectroscopy,Molecular Biology,General Medicine,Catalysis
Reference85 articles.
1. Barrier function of zebrafish embryonic chorions against microplastics and nanoplastics and its impact on embryo development;Duan;J. Hazard. Mater.,2020
2. Effects of several ecological factors on the hatching of Sepiella japonica wild and cultured eggs;Jiang;Chin. J. App. Ecol.,2010
3. Biological zero temperature and effective accumulated temperature for embryonic development of Sepiella japonica;Zhang;South China Fish Sci.,2011
4. Development of Amphioctopus fangsiao (Mollusca: Cephalopoda) from eggs to hatchlings: Indications for the embryonic developmental management;Jiang;Mar. Life Sci. Technol.,2020
5. Developmental and physiological challenges of octopus (Octopus vulgaris) early life stages under ocean warming;Repolho;J. Comp. Physiol. B,2014