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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Main Authors: Yaoyao Chu, Yan Liu, Jingyu Li, Qingli Gong
Format: Article
Language:English
Published: PeerJ Inc. 2019-11-01
Series:PeerJ
Subjects:
Online Access:https://peerj.com/articles/8040.pdf
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spelling 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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