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Effects of elevated CO2 on the photosynthesis and nitrate reductase activity of Pyropia haitanensis (Bangiales, Rhodophyta) grown at different nutrient levels

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Abstract

Pyropia haitanensis, a commercially important species, was cultured at two CO2 concentrations (390×10−6 and 700×10−6 (parts per million)) and at low and high nutrient levels, to explore the effect of elevated CO2 on the species under nutrient enrichment. Results show that in CO2-enriched thalli, relative growth rate (RGR) was enhanced under nutrient enrichment. Elevated CO2 decreased phycobiliprotein (PB) contents, but increased the contents of soluble carbohydrates. Nutrient enrichment increased the contents of chlorophyll a (Chl a) and PB, while soluble carbohydrate content decreased. CO2 enrichment enhanced the relative maximum electronic transport rate and light saturation point. In nutrient-enriched thalli the activity of nitrate reductase (NRA) increased under elevated CO2. An instantaneous pH change in seawater (from 8.1 to 9.6) resulted in reduction of NRA, and the thalli grown under both elevated CO2 and nutrient enrichment exhibited less pronounced reduction than in algae grown at the ambient CO2. The thermal optima of NRA under elevated CO2 and/or nutrient enrichment shifted to a lower temperature (10–15°C) compared to that in ambient conditions (20°C). We propose that accelerated photosynthesis could result in growth increment. N assimilation remained high in acidified seawater and reflected increased temperature sensitivity in response to elevated CO2 and eutrophication.

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Authors and Affiliations

  1. College of Environment and Energy, South China University of Technology, Guangzhou, 510006, China

    Chunxiang Liu  (刘春香) & Dinghui Zou  (邹定辉)

  2. Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou, 510006, China

    Chunxiang Liu  (刘春香) & Dinghui Zou  (邹定辉)

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  1. Chunxiang Liu  (刘春香)
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  2. Dinghui Zou  (邹定辉)
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Correspondence to Dinghui Zou  (邹定辉).

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Supported by the National Natural Science Foundation of China (Nos. 41276148, 41076094)

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Liu, C., Zou, D. Effects of elevated CO2 on the photosynthesis and nitrate reductase activity of Pyropia haitanensis (Bangiales, Rhodophyta) grown at different nutrient levels. Chin. J. Ocean. Limnol. 33, 419–429 (2015). https://doi.org/10.1007/s00343-015-4057-2

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