High Light Intensity and CO2 Enrichment Synergistically Mitigated the Stress Caused by Low Salinity in Pyropia yezoensis

Macroalgae, playing a crucial role in coastal marine ecosystems, are subject to multiple environmental challenges due to tidal and seasonal alterations. In this work, we investigated the physiological responses of Pyropia yezoensis to ocean acidification (ambient CO2 (AC: 400 μatm) and elevated CO2...

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Bibliographic Details
Published in:Journal of marine science and engineering 2023-11, Vol.11 (11), p.2193
Main Authors: Wu, Hailong, Wang, Chuchu, Li, He, Chen, Jiang, Zhang, Jiankai, Luo, Zixue, Cheng, Fangsheng, Xu, Juntian
Format: Article
Language:English
Subjects:
Acidification
Algae
Carbon dioxide
Carotenoids
Chlorophyll
Chlorophyll a
Coastal ecosystems
Environmental factors
Fluorescence
Growth
high CO2 level
Light
Light intensity
Luminous intensity
Marine ecosystems
Ocean acidification
Photons
Photosynthesis
Physiological responses
Pigments
Pyropia yezoensis
Saccharides
Salinity
Salinity effects
Seawater
Thalli
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Summary:Macroalgae, playing a crucial role in coastal marine ecosystems, are subject to multiple environmental challenges due to tidal and seasonal alterations. In this work, we investigated the physiological responses of Pyropia yezoensis to ocean acidification (ambient CO2 (AC: 400 μatm) and elevated CO2 (HC: 1000 μatm)) under changing salinity (20, 30 psu) and light intensities (50, 100 μmol photons m−2 s−1) by measuring the growth, pigment content, chlorophyll fluorescence, and soluble sugar content. The key results are the following: (1) P. yezoensis exhibited better growth under normal salinity (30 psu) compared to hyposaline conditions (20 psu). (2) Intermediate light intensity increased phycoerythrin content, ultimately enhancing thalli growth without significant changes to the contents of chlorophyll a and carotenoids. (3) Ocean acidification alleviated hyposaline stress by enhancing pigment production in P. yezoensis only at a salinity of 20 psu, highlighting the complex interplay of these environmental factors. These findings indicate that higher light intensities and elevated pCO2 levels could mitigate the stress caused by low salinity.
ISSN:2077-1312
2077-1312
DOI:10.3390/jmse11112193