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

Content Provider	Springer Nature Link
Author	Liu, Chunxiang Zou, Dinghui
Copyright Year	2015
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.
Starting Page	419
Ending Page	429
Page Count	11
File Format	PDF
ISSN	02544059
Journal	Chinese Journal of Oceanology and Limnology
Volume Number	33
Issue Number	2
e-ISSN	19935005
Language	English
Publisher	Science Press
Publisher Date	2014-12-10
Publisher Place	Heidelberg
Access Restriction	Subscribed
Subject Keyword	Pyropia haitanensis photosynthesis nitrate assimilation elevated CO2 eutrophication Oceanography
Content Type	Text
Resource Type	Article
Subject	Water Science and Technology Oceanography

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