Abstract
Although the thin-blade strain (HR-5) of Pyropia haitanensis could be cultivated in the south coast of China, the effect of low-salt tolerance on it is not clear. In this study, the conchospores and blades of the wild cultivated strain (WT-10) of P. haitanensis and HR-5 strain were cultured in media with salinity of 26‰, 10‰, and 3‰, respectively. The results illustrated that: After being cultured for 7 days, the survival percentages of conchospores were not significantly different between WT-10 and HR-5 at the salinity of 26‰ and 10‰ (P > 0.05), but the survival percentage was 60.8% higher in the latter than in the former at the salinity of 3‰ (P < 0.01). When the 25-day-old blades of WT-10 and HR-5 were cultured at the salinity of 26‰, 10‰, and 3‰ for another 20 days, the specific growth rates of the blades length in HR-5 were similar to WT-10, respectively. The contents of total phycobiliprotein of the HR-5 were 127.9, 88.7, and 83.0 mg/g, respectively, which were 1.8, 1.7, and 2.1 times those of the WT-10, showing highly significant differences (P < 0.01). In addition, with the decrease of culture salinity, the Fv/Fm values of WT-10 and HR-5 gradually decreased, but the reduction rate between the two strains was not significantly different (P > 0.05). The above results indicated that the low-salt tolerance of conchospores and blades of HR-5 was not weaker than that of WT-10, which provided a theoretical basis for the management mode when continuous precipitation was encountered in the cultivation process of HR-5 strain.
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Funding
This study was supported by the Open Project Fund for the Key Laboratory of Healthy Mariculture for the East China Sea, Ministry of Agriculture and Rural Affairs (2020ESHML05), the Startup Foundation for Young Teachers of Shanghai Ocean University (A2-2006-20-200301), the Major Science and Technology Specific Program of Zhejiang Province (2016C02055-6), the National Key Research and Development Program of China (2018YFD0900606).
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Ding, H., Huang, L. & Yan, X. Low-salt tolerance of the thin-blade strain in Pyropia haitanensis. Aquacult Int 29, 387–397 (2021). https://doi.org/10.1007/s10499-020-00637-7
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DOI: https://doi.org/10.1007/s10499-020-00637-7