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Faster recovery of a diatom from UV damage under ocean acidification

Paper ID Volume ID Publish Year Pages File Format Full-Text
29951 44448 2014 6 PDF Available
Title
Faster recovery of a diatom from UV damage under ocean acidification
Abstract

•We found a model diatom is less inhibited by UV under ocean acidification.•The recovery of photosystem II is faster under ocean acidification.•Low light promotes the recovery rate greatly.•Protein synthesis is crucial to the recovery of photosystem II.

Diatoms are the most important group of primary producers in marine ecosystems. As oceanic pH declines and increased stratification leads to the upper mixing layer becoming shallower, diatoms are interactively affected by both lower pH and higher average exposures to solar ultraviolet radiation. The photochemical yields of a model diatom, Phaeodactylum tricornutum, were inhibited by ultraviolet radiation under both growth and excess light levels, while the functional absorbance cross sections of the remaining photosystem II increased. Cells grown under ocean acidification (OA) were less affected during UV exposure. The recovery of PSII under low photosynthetically active radiation was much faster than in the dark, indicating that photosynthetic processes were essential for the full recovery of photosystem II. This light dependent recovery required de novo synthesized protein. Cells grown under ocean acidification recovered faster, possibly attributable to higher CO2 availability for the Calvin cycle producing more resources for repair. The lower UV inhibition combined with higher recovery rate under ocean acidification could benefit species such as P.tricornutum, and change their competitiveness in the future ocean.

Keywords
Ocean acidification; Ocean stratification; Photoinhibition; Photosystem II; UV radiation
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Faster recovery of a diatom from UV damage under ocean acidification
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology B: Biology - Volume 140, November 2014, Pages 249–254
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us