Effects of elevated pCO2 and nutrient enrichment on the growth, photosynthesis, and biochemical compositions of the brown alga Saccharina japonica (Laminariaceae, Phaeophyta)
Ocean acidification and eutrophication are two major environmental issues affecting kelp mariculture. In this study, the growth, photosynthesis, and biochemical compositions of adult sporophytes of Saccharina japonica were evaluated at different levels of pCO2 (400 and 800 µatm) and nutrients (nutri...
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doaj-752fc666fba14e69b1c5ce28e71575ad2020-11-25T02:39:01ZengPeerJ Inc.PeerJ2167-83592019-11-017e804010.7717/peerj.8040Effects of elevated pCO2 and nutrient enrichment on the growth, photosynthesis, and biochemical compositions of the brown alga Saccharina japonica (Laminariaceae, Phaeophyta)Yaoyao Chu0Yan Liu1Jingyu Li2Qingli Gong3College of Fisheries, Ocean University of China, Qingdao, Shandong, ChinaCollege of Fisheries, Ocean University of China, Qingdao, Shandong, ChinaCollege of Fisheries, Ocean University of China, Qingdao, Shandong, ChinaCollege of Fisheries, Ocean University of China, Qingdao, Shandong, ChinaOcean acidification and eutrophication are two major environmental issues affecting kelp mariculture. In this study, the growth, photosynthesis, and biochemical compositions of adult sporophytes of Saccharina japonica were evaluated at different levels of pCO2 (400 and 800 µatm) and nutrients (nutrient-enriched and non-enriched seawater). The relative growth rate (RGR), net photosynthetic rate, and all tested biochemical contents (including chlorophyll (Chl) a, Chl c, soluble carbohydrates, and soluble proteins) were significantly lower at 800 µatm than at 400 µatm pCO2. The RGR and the contents of Chl a and soluble proteins were significantly higher under nutrient-enriched conditions than under non-enriched conditions. Moreover, the negative effects of the elevated pCO2 level on the RGR, net photosynthetic rate, Chl c and the soluble carbohydrates and proteins contents were synergized by the elevated nutrient availability. These results implied that increased pCO2could suppress the growth and biochemical composition of adult sporophytes of S. japonica. The interactive effects of ocean acidification and eutrophication constitute a great threat to the cultivation of S. japonica due to growth inhibition and a reduction in quality.https://peerj.com/articles/8040.pdfOcean acidificationEutrophicationSaccharina japonicaGrowthPhotosynthesisBiochemical compositions |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Yaoyao Chu Yan Liu Jingyu Li Qingli Gong |
spellingShingle |
Yaoyao Chu Yan Liu Jingyu Li Qingli Gong Effects of elevated pCO2 and nutrient enrichment on the growth, photosynthesis, and biochemical compositions of the brown alga Saccharina japonica (Laminariaceae, Phaeophyta) PeerJ Ocean acidification Eutrophication Saccharina japonica Growth Photosynthesis Biochemical compositions |
author_facet |
Yaoyao Chu Yan Liu Jingyu Li Qingli Gong |
author_sort |
Yaoyao Chu |
title |
Effects of elevated pCO2 and nutrient enrichment on the growth, photosynthesis, and biochemical compositions of the brown alga Saccharina japonica (Laminariaceae, Phaeophyta) |
title_short |
Effects of elevated pCO2 and nutrient enrichment on the growth, photosynthesis, and biochemical compositions of the brown alga Saccharina japonica (Laminariaceae, Phaeophyta) |
title_full |
Effects of elevated pCO2 and nutrient enrichment on the growth, photosynthesis, and biochemical compositions of the brown alga Saccharina japonica (Laminariaceae, Phaeophyta) |
title_fullStr |
Effects of elevated pCO2 and nutrient enrichment on the growth, photosynthesis, and biochemical compositions of the brown alga Saccharina japonica (Laminariaceae, Phaeophyta) |
title_full_unstemmed |
Effects of elevated pCO2 and nutrient enrichment on the growth, photosynthesis, and biochemical compositions of the brown alga Saccharina japonica (Laminariaceae, Phaeophyta) |
title_sort |
effects of elevated pco2 and nutrient enrichment on the growth, photosynthesis, and biochemical compositions of the brown alga saccharina japonica (laminariaceae, phaeophyta) |
publisher |
PeerJ Inc. |
series |
PeerJ |
issn |
2167-8359 |
publishDate |
2019-11-01 |
description |
Ocean acidification and eutrophication are two major environmental issues affecting kelp mariculture. In this study, the growth, photosynthesis, and biochemical compositions of adult sporophytes of Saccharina japonica were evaluated at different levels of pCO2 (400 and 800 µatm) and nutrients (nutrient-enriched and non-enriched seawater). The relative growth rate (RGR), net photosynthetic rate, and all tested biochemical contents (including chlorophyll (Chl) a, Chl c, soluble carbohydrates, and soluble proteins) were significantly lower at 800 µatm than at 400 µatm pCO2. The RGR and the contents of Chl a and soluble proteins were significantly higher under nutrient-enriched conditions than under non-enriched conditions. Moreover, the negative effects of the elevated pCO2 level on the RGR, net photosynthetic rate, Chl c and the soluble carbohydrates and proteins contents were synergized by the elevated nutrient availability. These results implied that increased pCO2could suppress the growth and biochemical composition of adult sporophytes of S. japonica. The interactive effects of ocean acidification and eutrophication constitute a great threat to the cultivation of S. japonica due to growth inhibition and a reduction in quality. |
topic |
Ocean acidification Eutrophication Saccharina japonica Growth Photosynthesis Biochemical compositions |
url |
https://peerj.com/articles/8040.pdf |
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