Effect of seawater acidification and alkalization on photosynthetic physiology of <i>Thalassiosira punctigera</i>

Fan Jiale; Li Futian; Xu Juntian

doi:10.3969/j.issn.0253-4193.2020.12.007

Volume 42 Issue 12

Jan. 2021

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Fan Jiale，Li Futian，Xu Juntian. Effect of seawater acidification and alkalization on photosynthetic physiology of Thalassiosira punctigera[J]. Haiyang Xuebao，2020, 42(12)：62–71 doi: 10.3969/j.issn.0253-4193.2020.12.007

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Fan Jiale，Li Futian，Xu Juntian. Effect of seawater acidification and alkalization on photosynthetic physiology of Thalassiosira punctigera [J]. Haiyang Xuebao，2020, 42(12)：62–71 doi: 10.3969/j.issn.0253-4193.2020.12.007

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Effect of seawater acidification and alkalization on photosynthetic physiology of Thalassiosira punctigera

doi: 10.3969/j.issn.0253-4193.2020.12.007

Fan Jiale^1
,,
Li Futian¹,
Xu Juntian^{1, 2, 3
,
,}

1.
Jiangsu Provincial Key Laboratory of Marine Bioresources and Environment, Jiangsu Ocean University, Lianyungang 222005, China
2.
Co-Innovation Center of Jiangsu Marine Bio-industry Technology, Jiangsu Ocean University, Lianyungang 222005, China
3.
Jiangsu Provincial Key Laboratory of Marine Biotechnology, Jiangsu Ocean University, Lianyungang 222005, China

Received Date: 2019-07-14
Rev Recd Date: 2019-12-15

Available Online: 2020-12-24

Publish Date: 2020-12-25

Abstract

Abstract

Increasing atmospheric CO₂ concentration leads to ocean acidification, which might affect phytoplankton to varying degrees. Phytoplankton in coastal waters may be affected by seawater acidification and alkalization. In this experiment, Thalassoosira punctigera (diatom) was used to investigate its growth, photosynthesis, dark respiration, cell size, chlorophyll a content, biogenic silica content and chlorophyll fluorescence at seven pCO₂ levels (25 μatm, 50 μatm, 100 μatm, 200 μatm, 400 μatm, 800 μatm, 1 600 μatm). The results showed that, compared with 400 μatm, the growth rate and chlorophyll a content in seawater acidification (pCO₂ > 400 μatm) and alkalization (pCO₂ < 400 μatm) treatments were significantly reduced, but the degree of decrease was greater under the condition of alkalization. In addition, cells showed lower photosynthesis rates and maximum quantum yield of PSII (Fv/Fm) and relative maximum electron transport rate (rETRmax) under alkalization conditions. However, there was no significant changes in biogenic silica content and cell size among different pCO₂ levels. We found both seawater alkalization and acidification could inhibit the physiological activities of T. punctigera, and seawater alkalization had much more inhibited effects. Our results showed that the cell grown at current pCO₂ level (400 μatm) had the optical physiological performance. Moreover, among the pCO₂ levels set in this study, seawater alkalization has a more significant effect on T. punctigera. The present study provides a theoretical basis for studying the effects of changing seawater carbonate chemistry on the marine primary productivity in coastal waters.
- seawater acidification,
- seawater alkalization,
- photosynthetic physiology,
- Thalassiosira punctigera

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References(59)

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