Response of Juvenile Saccharina japonica to the Combined Stressors of Elevated pCO2 and Excess Copper

Coastal macroalgae may be subjected to global and local environmental stressors, such as ocean acidification and heavy-metal pollution. We investigated the growth, photosynthetic characteristics, and biochemical compositions of juvenile sporophytes of Saccharina japonica cultivated at two pCO2 level...

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Bibliographic Details
Published in:Plants (Basel) 2023-03, Vol.12 (5), p.1140
Main Authors: Zhang, Wenze, He, Lianghua, Pan, Jiangqi, Zhou, Yuhong, Ge, Ruxiang, Li, Sufang, Shi, Yunyun, Chen, Xinhua, Chu, Yaoyao
Format: Article
Language:English
Subjects:
Acidification
Algae
biochemical compositions
Carbohydrates
Carbon
Carbon dioxide
Chlorophyll
Copper
Electron transfer
Environmental changes
Environmental stress
growth
Growth rate
Heavy metals
Low level
Marine pollution
Ocean acidification
Photochemicals
Photosynthesis
photosynthetic characteristics
Physiology
Saccharina japonica
Seawater
Sporophytes
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Summary:Coastal macroalgae may be subjected to global and local environmental stressors, such as ocean acidification and heavy-metal pollution. We investigated the growth, photosynthetic characteristics, and biochemical compositions of juvenile sporophytes of Saccharina japonica cultivated at two pCO2 levels (400 and 1000 ppmv) and four copper concentrations (natural seawater, control; 0.2 μM, low level; 0.5 μM, medium level; and 1 μM, high level) to better understand how macroalgae respond to ongoing environmental changes. The results showed that the responses of juvenile S. japonica to copper concentrations depended on the pCO2 level. Under the 400 ppmv condition, medium and high copper concentrations significantly decreased the relative growth rate (RGR) and non-photochemical quenching (NPQ) but increased the relative electron transfer rate (rETR) and chlorophyll a (Chl a), chlorophyll c (Chl c), carotenoid (Car), and soluble carbohydrate contents. At 1000 ppmv, however, none of the parameters had significant differences between the different copper concentrations. Our data suggest that excess copper may inhibit the growth of juvenile sporophytes of S. japonica, but this negative effect could be alleviated by CO2-induced ocean acidification.
ISSN:2223-7747
2223-7747
DOI:10.3390/plants12051140