Effects of temperature and salinity on survival, growth and DNA methylation of juvenile Pacific abalone, Haliotis discus hannai Ino

• Published in: Chinese journal of oceanology and limnology 2017-09, Vol.35 (5), p.1248-1258
• Main Author: 孔宁 刘晓 李俊元 穆文丹 连建武 薛艳洁 李琪
• Format: Article
• Language: English
• Subjects: Abiotic factors; Abiotic stress; Aquaculture and Fisheries; Deoxyribonucleic acid; DNA; DNA methylation; DNA甲基化; Earth and Environmental Science; Earth Sciences; Epigenetics; Fish; Growth; Haliotis discus hannai; Individual rearing; Juveniles; Marine molluscs; Marine mollusks; Mollusks; Oceanography; Phenotypic variation; Phenotypic variations; Polymorphism; Profiles; Regulatory mechanisms (biology); Salinity; Salinity effects; Shellfish; Survival; Temperature effects; 太平洋; 幼鱼生长; 恒定温度; 海洋软体动物; 皱纹盘鲍; 盐度; 鲍鱼
• ISSN: 0254-4059; 2096-5508; 1993-5005; 2523-3521
• DOI: 10.1007/s00343-016-5185-z

Temperature and salinity are two of the most potent abiotic factors influencing marine mollusks. In this study, we investigated the individual and combined effects of temperature and salinity on the survival and growth of juvenile Pacific abalone, Haliotis discus hannai Ino, and also examined the DNA methylation alteration that may underpin the phenotypic variation of abalone exposed to different rearing conditions. The single-factor data showed that the suitable ranges of temperature and salinity were 16-28℃ at a constant salinity of 32, and 24-40 at a constant temperature of 20℃, respectively. The two-factor data indicated that both survival and growth were significantly affected by temperature, salinity and their interaction. The optimal temperature-salinity combination for juveniles was 23-25℃ and 30-36. To explore environment-induced DNA methylation alteration, the methylation-sensitive amplified polymorphism （MSAP） technique was used to analyze the genomic methylation profiles of abalone reared in optimal and adverse conditions. Neither temperature nor salinity induced evident changes in the global methylation level, but 67 and 63 differentially methylated loci were identified in temperature and salinity treatments, respectively. The between-group eigen analysis also showed that both temperature and salinity could induce epigenetic differentiation in H. discus hannai Ino. The results of our study provide optimal rearing conditions for juvenile tt. discus hannai Ino, and represent the first step toward revealing the epigenetic regulatory mechanism of abalone in response to thermal and salt stresses.